U.S. patent application number 09/888276 was filed with the patent office on 2002-05-09 for system and method for accelerating web site access and processing utilizing a computer system incorporating reconfigurable processors operating under a single operating system image.
Invention is credited to Huppenthal, Jon M..
Application Number | 20020056033 09/888276 |
Document ID | / |
Family ID | 25392899 |
Filed Date | 2002-05-09 |
United States Patent
Application |
20020056033 |
Kind Code |
A1 |
Huppenthal, Jon M. |
May 9, 2002 |
System and method for accelerating web site access and processing
utilizing a computer system incorporating reconfigurable processors
operating under a single operating system image
Abstract
A system and method for accelerating web site access and
processing utilizing a multiprocessor computer system incorporating
reconfigurable and standard microprocessors as the web site server.
One or more reconfigurable processors may be utilized, for example,
in accelerating site visitor demographic data processing, real time
web site content updating, database searches and other processing
associated with e-commerce applications. In a particular embodiment
disclosed, all of the reconfigurable and standard microprocessors
may be controlled by a single system image of the operating system,
although cluster management software may be utilized to cause a
cluster of microprocessors to appear to the user as a single copy
of the operating system.
Inventors: |
Huppenthal, Jon M.;
(Colorado Springs, CO) |
Correspondence
Address: |
Hogan & Hartson, LLP
Suite 1500
1200 17th Street
Denver
CO
80202
US
|
Family ID: |
25392899 |
Appl. No.: |
09/888276 |
Filed: |
June 22, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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09888276 |
Jun 22, 2001 |
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09563561 |
May 3, 2000 |
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09563561 |
May 3, 2000 |
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09481902 |
Jan 12, 2000 |
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6247110 |
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09481902 |
Jan 12, 2000 |
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08992763 |
Dec 17, 1997 |
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6076152 |
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Current U.S.
Class: |
712/15 |
Current CPC
Class: |
Y10S 707/99933 20130101;
G06F 15/7867 20130101 |
Class at
Publication: |
712/15 |
International
Class: |
G06F 015/00 |
Claims
What is claimed is:
1. A method for processing data at an internet site comprising:
providing a reconfigurable server at said site incorporating at
least one microprocessor and at least one reconfigurable processing
element; receiving N data elements at said site relative to a
remote computer coupled to said site; instantiating N of said
reconfigurable processing elements at said reconfigurable server;
and processing said N data elements with corresponding ones of said
N reconfigurable processing elements.
2. The method of claim 1 further comprising: selecting a content of
said site in response to said processed N data elements.
3. The method of claim 2 further comprising: transmitting said
content to said remote computer.
4. The method of claim 3 further comprising: displaying said
content at said remote computer.
5. The method of claim 1 wherein said N data elements comprise
demographic data pertaining to said remote computer.
6. The method of claim 1 wherein said N data elements comprise N
encrypted data elements transmitted by said remote computer to said
site.
7. The method of claim 6 wherein said step of processing said N
data elements comprises: decrypting said N encrypted data
elements.
8. The method of claim 1 wherein said N data elements comprise N
database query elements.
9. The method of claim 8 wherein said step of processing said N
data elements comprises: processing said N database query
elements.
10. The method of claim 1 further comprising: controlling said at
least one microprocessor and at least a portion of said at least
one reconfigurable processing element by a single system image of
an operating system.
11. An internet processing acceleration service comprising: a
reconfigurable server coupled to said internet, said server
comprising at least one microprocessor and at least one
reconfigurable processor; and a single system image of an operating
system controlling said at least one microprocessor and at least a
portion of said at least one reconfigurable processors; said
service instantiating N of said at least a portion of said at least
one reconfigurable processors for substantially parallel processing
of N data elements received by said server.
12. The service of claim 11 wherein said N data elements comprise
demographic data pertaining to a computer coupled to said server by
means of said internet.
13. The service of claim 12 wherein said server selects a content
for transmission to said computer by means of said internet based
upon said demographic data.
14. The service of claim 11 wherein said N data elements comprise
encrypted data elements transmitted to said server by a computer
coupled to said internet.
15. The service of claim 14 wherein said server is operative to
decrypt said encrypted data elements.
16. The service of claim 11 wherein said N data elements comprise
database query elements.
17. The service of claim 16 wherein said server is operative to
process said data base query.
18. A process of accelerating access time of a remote computer to
an internet site comprising: providing a reconfigurable server at
said site incorporating at least one microprocessor and at least
one reconfigurable processor; transmitting N data elements from
said remote computer to said server; substantially concurrently
processing said N data elements with N of said at least one
reconfigurable processors; selecting a content of said internet
site in response to said N data elements; and transmitting said
content to said remote computer.
19. The process of claim 18 wherein said N data elements comprise
demographic data pertaining to said remote computer.
20. The process of claim 18 wherein said N data elements comprise N
encrypted data elements.
21. The process of claim 20 wherein said step of substantially
concurrently processing said N data elements comprises: decrypting
said N encrypted data elements.
22. The process of claim 18 wherein said N data elements comprise N
database query elements.
23. The process of claim 22 wherein said step of substantially
concurrently processing said N data elements comprises: processing
said N database query elements.
24. The process of claim 18 further comprising: controlling said at
least one microprocessor and at least a portion of said at least
one reconfigurable processors by a single system image of an
operating system.
25. The process of claim 18 further comprising: displaying said
content at said remote computer.
Description
CROSS REFERENCE TO RELATED PATENT APPLICATIONS
[0001] The present invention is a continuation-in-part application
of U.S. patent application Ser. No. 09/563,561 filed May 3, 2000
which is a continuation-in-part application of U.S. patent
application Ser. No. 09/481,902 filed Jan. 13, 2000 which is a
continuation of U.S. patent application Ser. No. 08/992,763 filed
Dec. 17, 1997 for: "Multiprocessor Computer Architecture
Incorporating a Plurality of Memory Algorithm Processors in the
Memory Subsystem", assigned to SRC Computers, Inc., Colorado
Springs, Colo., assignee of the present invention, the disclosures
of which are herein specifically incorporated by this
reference.
BACKGROUND OF THE INVENTION
[0002] The present invention relates, in general, to the field of
computer architectures incorporating multiple processing elements
such as multi-adaptive processors ("MAP.TM.", is a trademark of SRC
Computers, Inc., Colorado Springs, Colo.). More particularly, the
present invention relates to systems and methods for accelerating
web site access and processing utilizing a computer system
incorporating reconfigurable processors operating under a single
operating system image.
[0003] Presently, many different forms of electronic business and
commerce are transacted by means of individual computers coupled to
the Internet. By virtue of its computer-based nature, many
electronic commerce ("e-commerce") web sites employ various methods
to allow their content to be varied based on the demographics of
the particular user.
[0004] This demographic information may be obtained in a variety of
ways, with some sites simply requesting the site visitor respond to
one or more questions while others may employ more sophisticated
techniques such as "click stream" processing. In this latter
instance, the prospective interests of the site visitor are
inferred by determination and analysis of, for example, the
previous sites he has visited. In either instance however, this
data must be processed by the site such that the web page content
may be altered in an effort to maximize it appeal to that
particular site visitor with a view toward ultimately maximizing
site revenue.
[0005] Since studies have shown that the average Internet user will
wait but a maximum of twenty seconds or so for a web page to be
updated, it is vitally important that the updating of the page
contents be completed as rapidly as possible. Consequently, a great
deal of effort is placed into maximizing the software performance
of algorithms that process the user demographic data. Currently,
all known web servers that accomplish this processing employ
industry standard microprocessor based servers and, as a result,
their maximum performance is thereby limited by the limitations
inherent in the standard microprocessor "load/store"
architecture.
SUMMARY OF THE INVENTION
[0006] SRC Computers, Inc., assignee of the present invention, is
an industry leader in the design and development of multiprocessor
computer systems including those employing industry standard
processors together with multi-adaptive processors ("MAP.TM.")
utilizing, for example, field programmable gate arrays functioning
as the programmable MAP elements.
[0007] Particularly disclosed herein is a system and method for
accelerating web site access and processing utilizing a
multiprocessor computer system incorporating one or more
microprocessors and a number of reconfigurable processors operating
under a single operating system image. In an exemplary embodiment,
a web site may be serviced with a hybrid multiprocessor computer
system that contains both industry standard microprocessors and one
or more reconfigurable processors that share all the system's
resources and operate under a single operating system image,
(although, in an alternative embodiment, cluster management
software may be used to make a cluster of microprocessors appear to
the user as a single copy of the operating system). In such a
system, demographic data processing algorithms may be loaded into
the reconfigurable processors which may be provided in the form of
specially adapted field programmable gate arrays ("FPGAs"). In this
manner, the appropriate algorithm may be implemented in hardware
gates (as opposed to software) which can process the data up to
1000 times faster than a standard microprocessor based server.
[0008] As an exemplary implementation, one particularly efficacious
hybrid computing system is the SRC Computers, Inc. SRC-6
incorporating multi-adaptive processors (MAP). In such a system,
the algorithms loaded into the MAP elements to process the data can
be completely changed in under 100 msec. This allows for the
possibility of quickly altering even the processing algorithm
without significantly delaying the site visitor. The ability to
change the algorithm, coupled with highly accelerated processing
times allows for more complex algorithms to be employed leading to
even more refined web page content adjustment.
[0009] Through the use of such a hybrid system operating under a
single operating system image, a standard operating system, such as
Solaris.TM. (trademark of Sun Microsystems, Inc., Palo Alto,
Calif.) may be employed and can be easily administered, a feature
which is important in such e-commerce based applications. Since the
MAP elements are inherently tightly-coupled into the system and are
not an attached processor located, for example, on an input/output
("I/O") port, their effectiveness and ease of use is maximized.
[0010] Demographic data processing is merely an example of how the
unique capabilities of such reconfigurable processing systems can
be utilized to accelerate e-commerce, and "secure socket" operation
is yet another possible application. In this instance, such
operations can often consume as much as 80% of the typical,
traditional site server microprocessor cycles. SRC Computers, Inc.
has demonstrated that reconfigurable processor based systems, such
as the SRC-6, can perform decryption algorithms up to 1000 times
faster than a conventional microprocessor thereby also allowing for
faster web site access while concomitantly allowing more robust
data encryption techniques to be employed. Similarly significant
speed advantages could be realized in, for example, implementing
database searches wherein the search algorithms can be directly
implemented in the hardware of the reconfigurable system providing
two to three orders of magnitude execution time improvements over
conventional microprocessor based solutions.
[0011] In general, the use of hybrid computer systems with a single
system image of the operating system for web site hosting allows
the site to employ user selected hardware accelerated versions of
software algorithms currently implemented in a wide array of
e-commerce related functions. This results in an easy to use system
with significantly faster processing capability which translates
into shorter site visitor waiting periods.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] The aforementioned and other features and objects of the
present invention and the manner of attaining them will become more
apparent and the invention itself will be best understood by
reference to the following description of a preferred embodiment
taken in conjunction with the accompanying drawings, wherein:
[0013] FIG. 1 is a simplified, high level, functional block diagram
of a multiprocessor computer architecture employing multi-adaptive
processors ("MAP.TM.") in accordance with the disclosure of the
aforementioned patent applications in an alternative embodiment
wherein direct memory access ("DMA") techniques may be utilized to
send commands to the MAP elements in addition to data;
[0014] FIG. 2 is a simplified logical block diagram of a possible
computer application program decomposition sequence for use in
conjunction with a multiprocessor computer architecture utilizing a
number of MAP elements located, for example, in the computer system
memory space, in accordance with a particular embodiment of the
present invention;
[0015] FIG. 3 is a more detailed functional block diagram of an
exemplary individual one of the MAP elements of the preceding
figures and illustrating the bank control logic, memory array and
MAP assembly thereof;
[0016] FIG. 4 is a more detailed functional block diagram of the
control block of the MAP assembly of the preceding illustration
illustrating its interconnection to the user FPGA thereof in a
particular embodiment;
[0017] FIG. 5 is a functional block diagram of an alternative
embodiment of the present invention wherein individual MAP elements
are closely associated with individual processor boards and each of
the MAP elements comprises independent chain ports for coupling the
MAP elements directly to each other;
[0018] FIG. 6 is a functional block diagram of an individual MAP
element wherein each comprises on board memory and a control block
providing common memory DMA capabilities;
[0019] FIG. 7 is an additional functional block diagram of an
individual MAP element illustrating the on board memory function as
an input buffer and output FIFO portions thereof;
[0020] FIG. 8 is a more detailed functional block diagram of an
individual MAP element as illustrated in FIGS. 6 and 7;
[0021] FIG. 9 is a user array interconnect diagram illustrating,
for example, four user FPGAs interconnected through horizontal,
vertical and diagonal buses to allow for expansion in designs that
exceed the capacity of a single FPGA;
[0022] FIG. 10 is a functional block diagram of another alternative
embodiment of the present invention wherein individual MAP elements
are closely associated with individual memory arrays and each of
the MAP elements comprises independent chain ports for coupling the
MAP elements directly to each other;
[0023] FIGS. 11A and 11B are timing diagrams respectively
illustrating input and output timing in relationship to the system
clock ("Sysclk") signal
[0024] FIG. 12 is a simplified illustration of a representative
operating environment for the system and method of the present
invention including a typical web site server as would be replaced
by an SRC-6 reconfigurable server;
[0025] FIG. 13 is a flowchart illustrating a conventional data
processing sequence in a conventional application of the typical
web site server depicted in the preceding figure. and
[0026] FIG. 14 is a corresponding flowchart illustrating the
processing of demographic or other data utilizing a reconfigurable
server for implementing the system and method of the present
invention and which results in significantly improved access and
data processing times.
DESCRIPTION OF A PREFERRED EMBODIMENT
[0027] With reference now to FIG. 1, a multiprocessor computer 10
architecture in accordance with one embodiment of the present
invention is shown. The multiprocessor computer 10 incorporates N
processors 12.sub.0 through 12.sub.N which are bi-directionally
coupled to a memory interconnect fabric 14. The memory interconnect
fabric 14 is then also coupled to M memory banks comprising memory
bank subsystems 16.sub.0 (Bank 0) through 16M (Bank M). N number of
multi-adaptive processors ("MAP.TM.") 112.sub.0 through 112.sub.N
are also coupled to the memory interconnect fabric 14 as will be
more fully described hereinafter.
[0028] With reference now to FIG. 2, a representative application
program decomposition for a multiprocessor computer architecture
100 incorporating a plurality of multi-adaptive processors in
accordance with the present invention is shown. The computer
architecture 100 is operative in response to user instructions and
data which, in a coarse grained portion of the decomposition, are
selectively directed to one of (for purposes of example only) four
parallel regions 102.sub.1 through 102.sub.4 inclusive. The
instructions and data output from each of the parallel regions
102.sub.1 through 102.sub.4 are respectively input to parallel
regions segregated into data areas 104.sub.1 through 104.sub.4 and
instruction areas 106.sub.1 through 106.sub.4. Data maintained in
the data areas 104.sub.1 through 104.sub.4 and instructions
maintained in the instruction areas 106.sub.1 through 106.sub.4 are
then supplied to, for example, corresponding pairs of processors
108.sub.1, 108.sub.2 (P1 and P2); 108.sub.3, 108.sub.4 (P3 and P4);
108.sub.5, 108.sub.6 (P5 and P6); and 108.sub.7, 108.sub.8 (P7 and
P8) as shown. At this point, the medium grained decomposition of
the instructions and data has been accomplished.
[0029] A fine grained decomposition, or parallelism, is effectuated
by a further algorithmic decomposition wherein the output of each
of the processors 108.sub.1 through 108.sub.8, is broken up, for
example, into a number of fundamental algorithms 110.sub.1A,
110.sub.1B, 110.sub.2A, 110.sub.2B through 110.sub.8B as shown.
Each of the algorithms is then supplied to a corresponding one of
the MAP elements 112.sub.1A, 112.sub.1B, 112.sub.2A, 112.sub.2B,
through 112.sub.8B which may be located in the memory space of the
computer architecture 100 for execution therein as will be more
fully described hereinafter.
[0030] With reference additionally now to FIG. 3, an exemplary
implementation of a memory bank 120 in a MAP system computer
architecture 100 of the present invention is shown for a
representative one of the MAP elements 112 illustrated in the
preceding figure. Each memory bank 120 includes a bank control
logic block 122 bi-directionally coupled to the computer system
trunk lines, for example, a 72 line bus 124. The bank control logic
block 122 is coupled to a bi-directional data bus 126 (for example
256 lines) and supplies addresses on an address bus 128 (for
example 17 lines) for accessing data at specified locations within
a memory array 130.
[0031] The data bus 126 and address bus 128 are also coupled to a
MAP element 112. The MAP element 112 comprises a control block 132
coupled to the address bus 128. The control block 132 is also
bi-directionally coupled to a user field programmable gate array
("FPGA") 134 by means of a number of signal lines 136. The user
FPGA 134 is coupled directly to the data bus 126. In a particular
embodiment, the FPGA 134 may be provided as a Lucent Technologies
OR3T80 device.
[0032] The computer architecture 100 comprises a multiprocessor
system employing uniform memory access across common shared memory
with one or more MAP elements 112 which may be located in the
memory subsystem, or memory space. As previously described, each
MAP element 112 contains at least one relatively large FPGA 134
that is used as a reconfigurable functional unit. In addition, a
control block 132 and a preprogrammed or dynamically programmable
configuration ROM (as will be more fully described hereinafter)
contains the information needed by the reconfigurable MAP element
112 to enable it to perform a specific algorithm. It is also
possible for the user to directly download a new configuration into
the FPGA 134 under program control, although in some instances this
may consume a number of memory accesses and might result in an
overall decrease in system performance if the algorithm was
short-lived.
[0033] FPGAs have particular advantages in the application shown
for several reasons. First, commercially available FPGAs now
contain sufficient internal logic cells to perform meaningful
computational functions. Secondly, they can operate at speeds
comparable to microprocessors, which eliminates the need for speed
matching buffers. Still further, the internal programmable routing
resources of FPGAs are now extensive enough that meaningful
algorithms can now be programmed without the need to reassign the
locations of the input/output ("1/0") pins.
[0034] By, for example, placing the MAP element 112 in the memory
subsystem or memory space, it can be readily accessed through the
use of memory read and write commands, which allows the use of a
variety of standard operating systems. In contrast, other
conventional implementations may propose placement of any
reconfigurable logic in or near the processor, however these
conventional implementations are generally much less effective in a
multiprocessor environment because, unlike the system and method of
the present invention, only one processor has rapid access to it.
Consequently, reconfigurable logic must be placed by every
processor in a multiprocessor system, which increases the overall
system cost. In addition, MAP element 112 can access the memory
array 130 itself, referred to as Direct Memory Access ("DMA"'),
allowing it to execute tasks independently and asynchronously of
the processor. In comparison, were it placed near the processor, it
would have to compete with the processors for system routing
resources in order to access memory, which deleteriously impacts
processor performance. Because MAP element 112 has DMA capability,
(allowing it to write to memory), and because it receives its
operands via writes to memory, it is possible to allow a MAP
element 112 to feed results to another MAP element 112. This is a
very powerful feature that allows for very extensive pipelining and
parallelizing of large tasks, which permits them to complete
faster.
[0035] Many of the algorithms that may be implemented will receive
an operand and require many clock cycles to produce a result. One
such example may be a multiplication that takes 64 clock cycles.
This same multiplication may also need to be performed on thousands
of operands. In this situation, the incoming operands would be
presented sequentially so that while the first operand requires 64
clock cycles to produce results at the output, the second operand,
arriving one clock cycle later at the input, will show results one
clock cycle later at the output. Thus, after an initial delay of 64
clock cycles, new output data will appear on every consecutive
clock cycle until the results of the last operand appears. This is
called "pipelining".
[0036] In a multiprocessor system, it is quite common for the
operating system to stop a processor in the middle of a task,
reassign it to a higher priority task, and then return it, or
another, to complete the initial task. When this is combined with a
pipelined algorithm, a problem arises (if the processor stops
issuing operands in the middle of a list and stops accepting
results) with respect to operands already issued but not yet
through the pipeline. To handle this issue, a solution involving
the combination of software and hardware is disclosed herein.
[0037] To make use of any type of conventional reconfigurable
hardware, the programmer could embed the necessary commands in his
application program code. The drawback to this approach is that a
program would then have to be tailored to be specific to the MAP
hardware. The system of the present invention eliminates this
problem. Multiprocessor computers often use software called
parallelizers. The purpose of this software is to analyze the
user's application code and determine how best to split it up among
the processors. The present invention provides significant
advantages over a conventional parallelizer and enables it to
recognize portions of the user code that represent algorithms that
exist in MAP elements 112 for that system and to then treat the MAP
element 112 as another computing element. The parallelizer then
automatically generates the necessary code to utilize the MAP
element 112. This allows the user to write the algorithm directly
in his code, allowing it to be more portable and reducing the
knowledge of the system hardware that he has to have to utilize the
MAP element 112.
[0038] With reference additionally now to FIG. 4, a block diagram
of the MAP control block 132 is shown in greater detail. The
control block 132 is coupled to receive a number of command bits
(for example, 17) from the address bus 128 at a command decoder
150. The command decoder 150 then supplies a number of register
control bits to a group of status registers iS2 on an eight bit bus
154. The command decoder 150 also supplies a single bit last
operand flag on line 156 to a pipeline counter 158. The pipeline
counter 158 supplies an eight bit output to an equality comparitor
160 on bus 162. The equality comparitor 160 also receives an eight
bit signal from the FPGA 134 on bus 136 indicative of the pipeline
depth. When the equality comparitor 160 determines that the
pipeline is empty, it provides a single bit pipeline empty flag on
line 164 for input to the status registers 152. The status
registers 152 are also coupled to receive an eight bit status
signal from the FPGA 134 on bus 136and it produces a sixty four bit
status word output on bus 166 in response to the signals on bus
136, 154 and line 164.
[0039] The command decoder 150 also supplies a five bit control
signal on line 168 to a configuration multiplexer ("MUX") 170 as
shown. The configuration MUX 170 receives a single bit output of a
256 bit parallel-serial converter 172 on line 176. The inputs of
the 256 bit parallel-to-serial converter 172 are coupled to a 256
bit user configuration pattern bus 174. The configuration MUX 170
also receives sixteen single bit inputs from the configuration ROMs
(illustrated as ROM 182) on bus 178 and provides a single bit
configuration file signal on line 180 to the user FPGA 134 as
selected by the control signals from the command decoder 150 on the
bus 168.
[0040] In operation, when a processor 108 is halted by the
operating system, the operating system will issue a last operand
command to the MAP element 112 through the use of command bits
embedded in the address field on bus 128. This command is
recognized by the command decoder 150 of the control block 132 and
it initiates a hardware pipeline counter 158. When the algorithm
was initially loaded into the FPGA 134, several output bits
connected to the control block 132 were configured to display a
binary representation of the number of clock cycles required to get
through its pipeline (i.e. pipeline "depth") on bus 136 input to
the equality comparitor 160. After receiving the last operand
command, the pipeline counter 158 in the control block 132 counts
clock cycles until its count equals the pipeline depth for that
particular. algorithm. At that point, the equality comparitor 160
in the control block 132 de-asserts a busy bit on line 164 in an
internal group of status registers 152. After issuing the last
operand signal, the processor 108 will repeatedly read the status
registers 152 and accept any output data on bus 166. When the busy
flag is de-asserted, the task can be stopped and the MAP element
112 utilized for a different task. It should be noted that it is
also possible to leave the MAP element 112 configured, transfer the
program to a different processor 108 and restart the task where it
left off.
[0041] In order to evaluate the effectiveness of the use of the MAP
element 112 in a given application, some form of feedback to the
use is required. Therefore, the MAP element 112 may be equipped
with internal registers in the control block 132 that allow it to
monitor efficiency related factors such as the number of input
operands versus output data, the number of idle cycles over time
and the number of system monitor interrupts received over time. One
of the advantages that the MAP element 112 has is that because of
its reconfigurable nature, the actual function and type of function
that are monitored can also change as the algorithm changes. This
provides the user with an almost infinite number of possible
monitored factors without having to monitor all factors all of the
time.
[0042] With reference additionally now to FIG. 5, a functional
block diagram of a portion of an alternative embodiment of a
computer system 20 in accordance with the of the present invention
is shown. In the computer system 20 illustrated, individual MAP
elements 112.sub.A, 112.sub.B etc. are each closely associated with
individual processor boards 22.sub.A, 22.sub.B respectively. As
depicted, each of the MAP elements 112 comprises independent chain
ports 24 for coupling the MAP elements 112 directly to each
other.
[0043] Individual ones of the MAP elements 112 are coupled between
the processor board 22 write trunk 26 and read trunk 28 of each
processor board 22 in addition to their coupling to each other by
means of the chain ports 24. A switch couples the write trunk 26
and read trunk 28 of any given processor board to any other memory
subsystem bank 16.sub.A, 16.sub.B etc. As generally illustrated,
each of the memory subsystem banks 16 includes a control-block 122
and one or more memory arrays 130.
[0044] With reference additionally now to FIG. 6, a functional
block diagram of an individual MAP element 112 is shown wherein
each MAP element 112 comprises an on board memory 40 and a control
block 46 providing common memory DMA capabilities. Briefly, the
write trunk 26 and read trunk 28 are coupled to the control block
46 from the common memory switch which provides addresses to the
memory 40 and receives addresses from the user array 42 on address
lines 48. Data supplied on the write trunk 26 is provided by the
control block 46 to the memory 40 on data lines 44 and data read
out of the memory 40 is provided on these same lines both to the
user array 42 as well as the control block 46 for subsequent
presentation on the read trunk 28. As indicated, the chain port 24
is coupled to the user array 42 for communication of read and write
data directly with other MAP elements 112.
[0045] With reference additionally now to FIG. 7, an additional
functional block diagram of an individual MAP element 112 is shown
particularly illustrating the memory 40 of the preceding figure
functioning as an input buffer 40 and output FIFO 74 portions
thereof. In this figure, an alternative view of the MAP element 112
of FIG. 6 is shown in which memory input data on line 50 (or the
write trunk 26) is supplied to an input buffer (memory 40) as well
as to a reconfigurable user array 42 coupled to the chain port 24.
The output of the reconfigurable array 42 is supplied to an output
FIFO 74 to provide memory output data on line 94 (or the read trunk
28) as well as to the chain port 24. The input buffer 40,
reconfigurable array 42 and output FIFO 74 operate under the
control of the control block 46.
[0046] With respect to the foregoing figures, each MAP element 112
may consist of a printed circuit board containing input operand
storage (i.e. the memory/input buffer 40), user array 42,
intelligent address generator control block 46, output result
storage FIFO 74 and I/O ports to allow connections to other MAP
elements 112 through the chain port 24 as well as the host system
memory array.
[0047] Input Operand Storage
[0048] The input storage consists of memory chips that are
initially loaded by memory writes from one of the microprocessors
12 in the host system or by MAP DMA. The buffer 40 may be, in a
particular embodiment, 72 bits wide and 2M entries deep. This
allows for storage of 64 bit operands and 8 error correction code
("ECC") bits for data correction if needed. Operands or reference
data can be read from this buffer 40 by the user array 42. Data is
not corrupted after use allowing for operand reuse by the MAP
elements 112. By reading operands only after the buffer 40 is
loaded, operands do not need to arrive at the MAP elements 112 in
time order. MAP elements 112 only require that store order be
maintained thus allowing for out-of-order arrival of operands prior
to storage in the input buffer 40. This means cache line transfers,
which typically can not be performed in a timed order but have four
times the bandwidth of un-cached transfers, can be used to load the
input buffers 40.
[0049] Intelligent Address Generator
[0050] The input buffer 40 contents are accessed by providing
address and read enable signals to it from the control block 46.
These addresses may be generated in one of two ways. First the
address bits can be provided by the programmable user array 42 to
the address generator control block 46 where it is combined with
other control signals and issued to the input buffer 40. This
allows for very random access into the buffer 40 such as would be
needed to access reference data. Another address mode requires the
user to issue a start command which contains a start address, stop
address, and stride. The address generator control block 46 will
then start accessing the input buffer 40 at the start address and
continue accessing it by adding the stride value to the last
address sent until the stop address is reached. This is potentially
a very useful technique when performing vector processing where
like elements are extracted out of an array. Since the stride can
be any number less than the delta between the start and stop
addresses, it is very easy for the MAP element 112 to perform a
data gather function which is highly valuable in the high
performance computing market.
[0051] User Array
[0052] The array 42 performs the actual computational functions of
the MAP element 112. It may comprise one or more high performance
field programmable gate arrays ("FPGAs") interconnected to the
other elements of the MAP element 112. A particular implementation
of the present invention disclosed in more detail hereinafter, may
use four such devices yielding in excess of 500,000 usable gates.
These components are configured by user commands that load the
contents of selected configuration ROMs into the FPGAs. After
configuration, the user array 42 can perform whatever function it
was programmed to do. In order to maximize its performance for
vector processing, the array 42 should be able to access two
streams of operands simultaneously. This is accomplished by
connecting one 72 bit wide input port to the input operand storage
and a second 72 bit wide port to the chain input connector port 24.
This connector allows the MAP element 112 to use data provided to
it by a previous MAP element 112. The chain port 24 allows
functions to be implemented that would far exceed the capability of
a single MAP element 112 assembly. In addition, since in the
particular implementation shown, only operands are transferred over
the chain port 24, the bandwidth may exceed the main memory
bandwidth resulting in superior performance to that of the fixed
instruction microprocessor-based processors 12.
[0053] The FPGAs may also contain on board phase locked loops
("PLLs") that allow the user to specify at what multiple or
sub-multiple of the system clock frequency the circuit will run.
This is important because certain complex functions may require
clocks that are slower than the system clock frequency. It may also
be that the user desires to synthesize a function resulting in
lower performance but faster time to market. By using PLLs, both of
these constraints can be accommodated. Another benefit in the
potential utilization of a PLL is that future generation FPGAs that
can operate faster than the current system clock speeds can be
retrofitted into slower systems and use the PLL frequency
multiplication feature to allow the MAP element 112 to run faster
than the rest of the system. This is turn results in a higher
performance MAP element 112.
[0054] Output Result Storage
[0055] When the user array 42 produces a result, it may be sent
over a 72 bit wide path to an output result storage element (for
example, output FIFO 74) which can then pass the data to either a
72 bit wide read port or a 72 bit wide chain port 24 to the next
MAP element 112. This storage device can made from a number of
different memory types. The use of a FIFO 74 storage device will
temporarily hold results that cannot be immediately read by a host
microprocessor or passed over the output chain port 24 to the next
stage. This feature allows for MAP elements 112 in a chain to run
at different frequencies. In this case the output FIFO 74 functions
like a speed matching buffer. In non-chained operation, the
microprocessor that is reading the results may be delayed. In this
case the FIFO 74 prevents the MAP element 112 from "stalling" while
waiting for results to be read. In a particular embodiment of the
present invention, a FIFO 74 that is 72 bits wide and 512K entries
deep may be utilized. As disclosed in the aforementioned patent
applications, the output storage may also be a true memory device
such as those found in common memory. In this case, write addresses
must be provided by the user array 42 or address generator and read
addresses provided by the entity reading the results from the
memory. While this may be somewhat more electrically complicated,
it has the advantage that results may be accessed in any order.
[0056] DMA Enhancements
[0057] In the aforementioned patent applications, the ability of
MAP elements 112 to perform DMA to common memory was disclosed.
While this capability was discussed primarily with respect to the
movement of operands and results, it is also possible to apply the
same concept to commands. The microprocessor that would normally
write a series of commands directly to the MAP element 112 may also
write the same commands into common memory as well. After writing a
series of commands, the microprocessor could then send an interrupt
to the MAP element 112. The MAP element 112 would then read the
commands from common memory and execute them as contemplated. Since
this command list could contain DMA instructions as specified in
the previously mentioned patent applications, the MAP element 112
could retrieve all of its input operands and store all of its
results without any further processor 12 intervention. At the
completion of MAP element 112 processing, the MAP element 112 could
then interrupt the microprocessor to signal that results are
available in common memory. Operation in this manner reduces the
interaction required between the MAP element 112 and the
microprocessor.
[0058] On Board Library
[0059] As originally disclosed, electrically erasable programmable
ROMs ("EEPROMs") or similar devices may be utilized to hold a
library of functions for the user array 42. By placing these
algorithms in ROMs on the MAP element 112 itself, the user array 42
function can be changed very rapidly. In this manner, the user
program can download a new function into one of the on board ROMs
thus updating its contents and allowing the MAP element 112 to
perform new functions. In a particular implementation, this may be
accomplished by reserving one of the library functions to perform
the function of an EEPROM programmer. When a command to update a
ROM is received, the user array 42 may be configured with this
special function and data read from the MAP element 112 input
storage (e.g. input buffer 40) and then loaded into the ROMs to
complete the update process.
[0060] With reference additionally now to FIG. 8 a more detailed
functional block diagram of an individual MAP element 112 is shown
as previously illustrated in FIGS. 6 and 7. In this depiction, the
MAP element 112 includes an enhanced synchronous dynamic random
access memory (ESDRAM.TM., a trademark of Enhanced Memory Systems,
Inc., Colorado Springs, Colo.) functioning as the memory, or input
buffer 40. ESDRAM memory is a very high speed memory device
incorporating a dynamic random access memory ("DRAM") array
augmented with an on-chip static random access memory ("SRAM") row
register to speed device read operations.
[0061] In this figure, like structure to that previously described
is like numbered and the foregoing description thereof shall
suffice herefor. Memory input data on lines 50 is supplied through
transmission gates 52 to the data lines 44 for provision to the
memory 40 and user array 42. In like manner, address input is
received on lines 54 for provision through transmission gates 56 to
the address lines 48 coupled to the memory 40 and control block 46.
The control block 46 operatively controls the transmission gates
52, 56 and receives an FS11 signal on line 60 and provides a
LOCKOUT signal on line 62.
[0062] The user array 42 may be coupled, as shown, to the chain
port 24 and it provides a user address signal on lines 64 and a
next address signal on lines 66 to the control block 46. The
control block 46, provides an indication of whether or not an input
is valid to the user array 42 on lines 68. Output of the user array
42 is provided on lines 70 together with a write clock ("WRTCLK")
signal on line 72 to the FIFO 74 or other output storage device.
The FIFO 74 receives a read clock ("RDCLK") signal on line 78 from
the control block 46. Output from the FIFO 74 or control block 46
may be selectively supplied on lines 80 through transmission gates
76 to the chain port 24 and/or through transmission gates 82 to
provide memory data on lines 94. The control block 46 also receives
a chain read signal on lines 90 and returns a chain valid output on
lines 92. The control block 46 operatively controls the
transmission gates 76 and 82 in addition to transmission gates 86
which serve to provide error correction code ("ECC") output signals
on lines 88.
[0063] As mentioned previously, the MAP elements 112 may comprise
one or more circuit boards, utilizing, for example, one Lucent
Orca.TM. OR3T80 FPGA to function as the control block 46 and, four
OR3TI25 FPGAs forming the user array 42. The user can implement
algorithms in these FPGAs that alter data that is written to it and
provide this altered data when the MAP element 112 is then read. In
addition, each MAP element 112 may also comprise eight sets of four
configuration ROMs on board. These ROMs are preprogrammed by the
user and configure the four user FPGAs of the user array 42 under
program control. These ROMs may be reprogrammed either externally
or while on the MAP element 112 located in a system.
[0064] The MAP elements 112 are accessed through the use of normal
memory READ and WRITE commands. In the representative embodiment
illustrated and described, the user can provide operands to the MAP
elements 112 either by directly writing 128-bit packets (i.e. in
the form of two 64-bit words) into the user array 42 chips or by
writing 256-bit packets (in the form of four 64-bit words) into a
dedicated 16-MB ESDRAM memory input data buffer 40. A read from a
MAP element 112 always returns a 2-word packet and part of this
returned packet contains status information as will be more fully
described hereinafter. In addition, the incoming addresses are
decoded into commands as will also be defined later.
[0065] MAP elements 112 also have the ability to be chained via
hardware. This allows the output data from one MAP element 112 to
move directly to the user array 42 chips of the next MAP element
112 without processor 12 intervention. Chain length is limited by
the quantity of MAP elements 112 in the overall system. The total
number of MAP elements 112 may also be broken down into several
smaller independent chains. In a chained mode of operation, a MAP
element 112 can still read from its input buffer 40 to access
reference information such as reciprocal approximation tables.
[0066] Logic Conventions
[0067] In the representative implementation of the computer system
of the present invention disclosed herein, the processors 12 may
comprise Pentium.TM. (a trademark of Intel Corporation, Santa
Clara, Calif.) processors and these devices utilize an active "low"
logic convention which applies to all address bits and data words
transmitted to or from the MAP elements 112 including the returned
status word.
[0068] With reference additionally now to FIG. 9, a user array
interconnect 200 diagram is shown, for example, utilizing four user
FPGAs interconnected through horizontal, vertical and diagonal
buses to allow for expansion in designs that might exceed the
capacity of a single FPGA. In this regard, the interconnect diagram
200 corresponds to the user array 42 of the preceding figures with
input data bus 210 corresponding to the data lines 44, the chain
input bus 212 corresponding to the chain port 24 and the output bus
214 corresponding to the lines 70 of FIG. 8. The four FPGAs 202,
204, 206 and 208 comprising the user array 42 are each coupled to
the input data bus 210, chain input bus 212 and output bus 214 as
well as to each other by means of top bus 216, right bus 218,
bottom bus 220, left bus 222 and diagonal buses 224 and 226.
[0069] User Array Interconnect
[0070] As previously described, the four user FPGAs (202, 204, 206
and 208) are interconnected through a series of horizontal,
vertical, and diagonal buses which allow the easiest expansion of
the existing symmetric internal chip routing for designs that
exceed the capacity of a single FPGA for the user array 42. In the
exemplary illustration shown, bus sizes were chosen to utilize as
many pins as possible while maintaining a bus width of at least 64
bits.
[0071] Address Structure
[0072] Because MAP may be located in the memory array of the system
and decodes a portion of the address field, the address generated
by the processor 12 must be correctly assembled. The following
Table 1 shows the address bit allocation as seen by the processor
12 and the MAP element 112 board. The processor board bridge
elements will reallocate the bit positions that are actually
transmitted to the MAP element 112 based on system size.
[0073] Field Select Bits
[0074] The Field Select bits are the two most significant address
bits leaving the bridge elements and are used to select which of
the four possible mezzanine cards in the memory stack is being
accessed. The Field Select bits for all mezzanine cards are
determined by the state of P6 bus bits A[21:20]. If bit A21 is set,
a MAP element 112 operation is underway and the Field Select bits
are set to 11. The MAP element 112 is always located just above the
semaphore registers with the first MAP element 112 in segment 0
bank 0, the second in segment 1 bank 0 and so on until one MAP
element 112 is each segment's bank 0. They are then placed in
segment 0 bank 1 and the same pattern is followed until all are
placed. This keeps them in a continuous address block.
[0075] Chip Select Bits
[0076] The next 3 most significant bits are Chip Select bits. These
normally select which one of the eight rows of memory chips on a
mezzanine board are activated. For MAP elements 112, Chip Selects 0
and 1 are used. Chip Select 0 is used to write to the ESDRAM memory
input buffer 40 and Chip Select 1 is used to access the control
block 46 and user chips of the user array 42.
[0077] Memory Address Bits
[0078] The next 19 most significant bits on the P6 bus are Memory
Address bits that normally select the actual location within the
memory chip of the cache line in use. Five of these bits are
decoded by the MAP element 112 into various commands that are
discussed in greater detail hereinafter.
[0079] Bank Select Bits
[0080] The next 4 most significant bits are the Bank Select bits.
These bits are used to select the specific bank within a segment in
which the desired memory or MAP element 112 is located.
[0081] Trunk Select Bits
[0082] The next 4 most significant bits are the Trunk Select bits.
The number of these bits range from 0 to 4 depending upon the
number of segments in the system. These bits are used to select the
segment that contains the desired memory or MAP. Unused bits are
set to 0.
1TABLE 1 P6 to Packet Bit Translation Address P6 Bus Packet Bit
Bridge Output 0 0 1 0 2 0 3 Cmd 0 13 Cmd 0 4 Cmd 1 14 Cmd I 5 0 15
Map Sel 4 6 0 19 Map Sel 0 7 0 20 Map Sel 1 8 0 21 Map Sel 2 9 0 22
Map Sel 3 10 Cmd 2 23 Cmd 2 11 Cmd 3 24 Cmd 3 12 Sel 0 25 Sel 0 13
Sel 1 26 Sel 1 14 Sel 2 27 Sel 2 15 0 28 0 16 Map Sel 0 29 0 17 Map
Sel 1 30 0 18 Map Sel 2 31 0 19 Map Sel 3 32 0 20 Map Sel 4 33 0 21
1 34 0 22 0 35 0 23 0 36 0 24 0 37 0 25 0 38 0 26 0 39 0 27 0 40 0
28 0 41 0 29 0 42 Chip Sel 0 30 0 43 Chip Sel 1 31 0 44 Chip Sel 2
32 0 45 1 33 0 46 1 34 0 35 0
[0083] Word Select Bits
[0084] The next 2 most significant bits are the Word Select bits.
These bits determine the order in which each word of a 4-word cache
line is being used. With CS[1:0] set to 01, these bits are part of
the decoded command.
[0085] MAP Command Decode
[0086] CMD[3:0] are decoded into the following commands by the MAP
control block 46 chip when CS[1:0] are 01 as shown in the following
Table 2. This decode is also dependent upon the transaction being
either a READ or WRITE. In addition, SEL[2:0] are used in
conjunction with the RECON and LDROM commands described hereinafter
to select which one of the eight ROM's is to be used.
2TABLE 2 Address Bit Command Decode CMD [3:0] 3 2 1 0 Read/Write
Command Basic Function 1 1 1 1 Write Null MAP operation continues
as before this was received. 1 1 1 0 Write RMB Resets MAP Board
user chips and reconfigures control chips. 1 1 0 1 Write RUC Resets
User and control chip latches. 1 1 0 0 Write RECON RECONfigures
user circuits. Used with SEL[2:0]. 1 0 1 1 Write LASTOP LAST
OPerand is being written. 1 0 1 0 Write WRTOP WRiTe OPerand to user
circuit. 1 0 0 1 Write DONE Processor is DONE with MAP clears busy
flag. 1 0 0 0 Write LDROM Loads a new algorithm from input buffer
into the ROM selected by SEL[2:0]. 0 1 1 1 Write START Sends start
address, stop address, auto/user, and stride to input control chip
starting MAP operation. 0 1 1 0 Write Future Reserved. 0 1 0 1
Write Future Reserved. 0 1 0 0 Write Future Reserved. 0 0 1 1 Write
Future Reserved. 0 0 1 0 Write Future Reserved. 0 0 0 1 Write
Future Reserved. 0 0 0 0 Write Future Reserved. 1 1 1 1 Read Null
MAP operation continues as before this was received. 1 1 1 0 Read
RDSTAT Reads status word. 1 1 0 1 Read RDDAT Reads 2 data words. 1
1 0 0 Read RDDAST Reads status word and 1 data word. 1 0 1 1 Read
Future Reserved. 1 0 1 0 Read Future Reserved. 1 0 0 1 Read Future
Reserved. 1 0 0 0 Read Future Reserved. 0 1 1 1 Read Future
Reserved. 0 1 1 0 Read Future Reserved. 0 1 0 1 Read Future
Reserved. 0 1 0 0 Read Future Reserved. 0 0 1 1 Read Future
Reserved. 0 0 1 0 Read Future Reserved. 0 0 0 1 Read Future
Reserved. 0 0 0 0 Read Future Reserved.
[0087] Null Command Description
[0088] When a MAP element 112 is not actively receiving a command,
all inputs are set to 1 and all internal circuits are held static.
Therefore, an incoming command of "1 1 1 1" cannot be decoded as
anything and is not used.
[0089] RMB
[0090] This command, issued during a write transaction, causes the
control block 46 chips to generate a global set ("GSR") to the user
chips of the user array 42 and reprograms the control chips. All
internal latches are reset but the configuration of the user chip
is not changed. Any data that was waiting to be read will be
lost.
[0091] RUC
[0092] This command, issued during a write transaction, causes the
control chips to generate GSR signal to all four user FPGAs of the
user array 42. All internal latches are reset, but the
configuration is not changed. Any operands will be lost, but data
waiting to be read in the control block 46 chips will not.
[0093] RECON
[0094] This command, issued during a write transaction, causes the
control chips to reconfigure the four user FPGAs of the user array
42 with the ROM selected by SEL[2:0]. Any operands still in process
will be lost, but data waiting to be read in the control chip will
not.
[0095] LASTOP
[0096] This command is issued during a write transaction to inform
the MAP element 112 control block 46 chip that no more operands
will be sent and the pipeline should be flushed. The control chips
start the pipeline counter and continue to provide read data until
the pipeline depth is reached.
[0097] WRTOP
[0098] This command is issued during a write transaction to inform
the MAP element 112 control block 46 chip that it is receiving a
valid operand to be forwarded directly to the user circuits.
[0099] DONE
[0100] This command is issued during a write transaction to inform
the MAP element 112 control block 46 chip that the processor 12 is
done using the MAP element 112. The control chips reset the busy
bit in the status word and wait for a new user. The configuration
currently loaded into the user circuits is not altered.
[0101] LDROM
[0102] This command is issued during a write transaction to inform
the MAP element 112 control block 46 chip that the ROM specified by
SEL[2:0] is to be reloaded with the contents of the input buffer 40
starting at address 0. This will cause a nonvolatile change to be
made to one of the eight on-board algorithms.
[0103] START
[0104] This command is issued during a write transaction and sends
the start address, stop address, auto/user selection and stride to
input controller. The input controller then takes control of input
buffer 40 and starts transferring operands to the user chips of the
user array 42 using these parameters until the stop address is hit.
The data word 0 that accompanies this instruction contains the
start address in bits 0 through 20, the stop address in bits 23
through 43, the stride in bits 46 through 51 and the user/auto bit
in bit position 54. In all cases the least significant bit ("LSB")
of each bit group contains the LSB of the value.
[0105] RDSTAT
[0106] This command is issued during a read transaction to cause a
status word to be returned to the processor 12. This transaction
will not increment the pipeline counter if it follows a LASTOP
command. Details of the status word are shown in the following
Table 4.
[0107] RDDAT
[0108] This command is issued during a read transaction to cause 2
data words to be returned to the processor 12. This transaction
will increment the pipeline counter if it follows a LASTOP command.
Details of the status word are also shown in Table 4.
[0109] RDDAST
[0110] This command is issued during a read transaction to cause a
status word and data word to be returned to the processor 12.
[0111] SEL[2:0] Decode
[0112] The SEL[2:0] bits are used for two purposes. When used in
conjunction with the RECON or LDROM commands, they determine which
of the eight on-board ROM sets are to be used for that instruction.
This is defined in the following Table 3.
3TABLE 3 SEL[2:0] Decode 2 1 0 ROM Select Function 0 0 0 ROM set 0
0 0 1 ROM set 1 0 1 0 ROM set 2 0 1 1 ROM set 3 1 0 0 ROM set 4 1 0
1 ROM set 5 1 1 0 ROM set 6 1 1 1 ROM set 7
[0113] Status Word Structure
[0114] Whenever a read transaction occurs, a status word is
returned to the processor 12 issuing the read. The structure of
this 64-bit word is as follows:
4TABLE 4 Status Word Structure Bits Function 0-7 Contains the
pipeline depth of the current user algorithm 8 A 1 indicates that
the pipeline is empty following a LASTOP command. 9-31 These lines
are tied low and are not used at this time. 32-35 Contains the
current configuration selection loaded into the user FPGA's. 36-58
These lines are tied low and are not used at this time. 59 A 1
indicates that data was written and has overflowed the input
buffers. 60 A 1 indicates that a reconfiguration of the user FPGA's
is complete. 61 A 1 indicates that the data word is valid 62 A 1
indicates that at least 128 words are available 63 A 1 indicates
that the MAP is busy and cannot be used by another processor. Note:
Bit 63 is always the most significant bit ("MSB") as indicated in
the following illustration: 63 0 MSB LSB
[0115] Single MAP Element Operation
[0116] Normal operation of the MAP elements 112 are as follows.
After power up, the MAP element 112 control block 46 chip
automatically configures and resets itself. No configuration exists
in the four user chips of the user array 42. A processor 12 that
wants to use a MAP element 112 first sends an RDSTAT command to the
MAP element 112.
[0117] If the MAP element 112 is not currently in use, the status
word is returned with bit 63 "0" (not busy) and the busy bit is
then set to 1 on the MAP element 112. Any further RDSTAT or RDDAST
commands show MAP element 112 to be busy.
[0118] After evaluating the busy bit and observing it to be "low",
the processor 12 issues a RECON command along with the appropriate
configuration ROM selection bits set. This causes the MAP element
112 to configure the user chips of the user array 42. While this is
happening, status bit 60 is "low". The processor 12 issues an
RDSTAT and evaluates bit 60 until it returns "high". At this point,
configuration is complete and the user chips of the user array 42
have reset themselves clearing all internal registers. The user
then issues an RUC command to ensure that any previous data left in
the user array 42 or control block 46 circuits has been
cleared.
[0119] The user now has two methods available to present data to
the MAP element 112. It can either be directly written two quad
words at a time into the user chips of the user array 42 or the
input buffer 40 can be loaded.
[0120] Writing quad words is useful for providing a small number of
reference values to the user array 42 but does have lower bandwidth
than using the input buffers 40 due to the 128-bit per transfer
limit on un-cached writes. To use this mode, a WRTOP command is
sent that delivers two 64-bit words to the user circuits. Based on
previous knowledge of the algorithm, the program should know how
many operands can be issued before an RDDAST could be performed.
Evaluating status bits 0 through 7 after configuration also
indicates the pipeline depth for this calculation.
[0121] If a large data set is to be operated on, or if a large
quantity of the operands are to be reused, the input data buffer 40
should be used. In a particular embodiment of the present
invention, this buffer may comprise 2M quad words of ESDRAM memory
storage. This memory is located on the MAP element 112 and is
accessed by performing cache line writes. This allows the loading
of four 64-bit words per transaction. Once the data set is loaded,
a START command is issued.
[0122] The control block 46 chip will assert the lockout bit
signaling the memory controller not to access the input buffer 40.
It will also evaluate data word "0" of this transaction in
accordance with the previously defined fields.
[0123] If the Auto/User bit is a "1", the addresses will
automatically be generated by the control block 46 chip. The first
address will be the start address that was transferred. The address
is then incremented by the stride value until the stop address is
hit. This address is the last address accessed.
[0124] At this point the lockout bit is released and the memory
controller can access the input buffer 40. it should be noted that
the input control chip must interleave accesses to the input buffer
40 with refresh signals provided by the memory controller in order
to maintain the ESDRAM memory while the lockout bit is set.
[0125] If the Auto/User bit was at "0", the operation is the same
except the addresses are provided to the input control block 46
chip by the user algorithm.
[0126] Once the START command is issued, the processor 12 can start
to read the output data. The user must first issue a RDDAST, which
will return a status word and a data word. If bit 61 of the status
word is a 1, the data word is valid. The user will continue this
process until status word bit 62 is a 1. At this point the user
knows that the output FIFO 74 on the MAP element 112 contains at
least 128 valid data words and the RDDAT command can now be used
for the next 64 reads. This command will return two valid data
words without any status. After the 64 RDDAT commands the user must
again issue a RDDAST command and check bits 61 and 62. If neither
is set, the FIFO 74 has no further data. If only 61 is set the
program should continue to issue RDDAST commands to empty the FIFO
74. If 61 and 62 are set, the program can resume with another set
of 64 RDDAT commands and repeat the process until all results are
received.
[0127] After all data is read and the user has completed his need
for a MAP element 112, a DONE command is issued. This will clear
the busy flag and allow other processors 12 to use it. It should be
noted that data in the input buffer 40 is not corrupted when used
and can therefore be reused until a DONE is issued.
[0128] Chained MAP Operation
[0129] MAP elements 112 have the ability to run in a vectored or
VMAP.TM. mode (VMAP is a trademark of SRC Computers, Inc., assignee
of the present invention). This mode allows the output data from
one MAP element 112 to be sent directly to the user chips in the
user array 42 of the next MAP element 112 with no processor 12
intervention. In a representative embodiment, this link, or chain
port 24, operates at up to 800 MB/sec and connects all MAP elements
112 in a system in a chain. A chain must consist of a sequential
group of at least two MAP elements 112 and up to as many as the
system contains. Multiple non-overlapping chains may coexist.
[0130] To use this mode, the user simply designs the algorithm to
accept input data from the chainin[00:63] pins. Output data paths
are unchanged and always go to both the memory data bus and the
chainout[00:63] pins.
[0131] VMAP mode operation is identical to single MAP element 112
operation except the data buffer 40 on the first MAP element 112 in
the chain is loaded with data and all results are read from the
last MAP element 112. Chained MAP elements 112 simultaneously read
from their input buffer 40 while accepting operands from the
chainin port. This allows the buffers 40 used to supply reference
during chained operation. To do this the input buffers 40 must
first be loaded and then START commands must be sent to all MAP
elements in the chain. The first MAP element 112 in the chain must
be the last one to receive a START command. All MAP elements 112
other than the first in the chain must receive a START command with
the user address mode selected.
[0132] LDROM Operation
[0133] MAP elements 112 have the capability to allow the contents
of an on-board ROM to be externally reloaded while the system is
operating, thus changing the algorithm. It should be noted that the
same ROM for all four user chips in the user array 42 will
simultaneously be updated.
[0134] To accomplish this, the configuration files of the four ROMs
of a given set are converted from a serial stream to 16-bit words.
The first words of each ROM file are then combined to form a 64-bit
word. User chip 0 of the user array 42 files fill bits 0 through
15, chip 1 is 16 through 31, chip 2 is 31 through 47, and chip 3 is
48 through 64. This process is repeated until all four of the
individual files are consumed. This results in a file that is
64-bits wide and 51,935 entries deep.
[0135] If the contents of a particular ROM in the set are to be
unaltered, its entries must be all 0. At the top of this file, a
header word is added that contains all 1's in all bit positions for
all ROMs in the set that are to be updated. ROMs that are to be
unaltered will contain zeros in this word. This file is then loaded
into the MAP element 112 input buffer 40 with the header loaded
into address 0.
[0136] Upon receiving an LDROM command, the input controller will
load the user chips of the user array 42 with a special algorithm
that turns them into ROM programmers. These chips will then start
accessing the data in the input buffer 40 and will evaluate word
0.
[0137] If this is a 0, no further action will be taken by that
chip. If it is a 1, the chip will continue to extract data,
serialize it, and load it into the ROM that was selected by the
state of the SEL lines during the LDROM command. While this is
happening, bit 60 of the status word is 0. When complete, bit 60
will return to a 1.
[0138] The user must always issue a RECON command following an
LDROM command in order to load a valid user algorithm back into the
user array 42 and overwrite the ROM programmer algorithm.
[0139] With reference additionally now to FIG. 10, a functional
block diagram of another alternative embodiment 230 of the present
invention is shown wherein individual MAP elements 112 are closely
associated with individual memory arrays and each of the MAP
elements 112 comprises independent chain ports 24 for coupling the
MAP elements 112 directly to each other. The system illustrated
comprises a processor assembly comprising one or more processors 12
bi-directionally coupled through a processor switch (which may
comprise an FPGA) to a write trunks 26 and read trunks 28.
[0140] In the example illustrated, a number of MAP elements 112 are
associated with a particular memory array 246 under control of a
memory controller 238 (which may also comprise an FPGA). As
illustrated, each of the memory controllers 238.sub.A and 238.sub.B
are coupled to the processor assembly 232 through the processor
switch 234 by means of the write and read trunks 26, 28. Each of
the memory controllers may be coupled to a plurality of MAP
elements 112 and associated memory array 246 and to additional MAP
elements 112 by means of a chain port 24 as previously described.
In the embodiment illustrated, memory controller 238.sub.A is in
operative association with a pair of MAP elements, the first
comprising buffer 240.sub.A1, user array 242.sub.A1 and FIFO
244.sub.A1 associated with memory array 246.sub.A1 and the second
comprising buffer 240.sub.A2, user array 242.sub.A2 and FIFO
244.sub.A2 associated with memory array 246.sub.A2. In like manner,
memory controller 238.sub.B is in operative association with a pair
of MAP elements, the first comprising buffer 240.sub.B1, user array
242.sub.B1 and FIFO 244.sub.B1 associated with memory array
246.sub.B1 and the second comprising buffer 240.sub.B2, user array
242.sub.B2 and FIFO 244.sub.B2 associated with memory array
246.sub.B2.
[0141] With reference additionally now to FIGS. 11A and 11B
separate timing diagrams are illustrated respectively depicting
input and output timing in relationship to the system clock
("Sysclk") signal.
[0142] Interface Timing
[0143] The MAP element 112 user array 42 can accept data from the
input memory bus, input buffer 40 or the chain port 24. In the
embodiment of the present invention previously described and
illustrated, all sixty four bits from any of these sources are sent
to all four of the user chips (202, 204, 206 and 208; FIG. 9) along
with a VALID IN signal on lines 68 (FIG. 8) sent from the control
block 46 that enables the input clock in the user chips of the user
array 42.
[0144] This signal stays high for ten, twenty or forty nanoseconds
depending on whether one, two or four words are being transferred.
This VALID IN signal on lines 68 connects to the clock enable pins
of input latches in the user chips of the user array 42. These
latches then feed the user circuit in the MAP element 112. The
timing for the various write operations is shown in with
particularity in FIG. 11A.
[0145] Input Timing
[0146] After the algorithm operation has completed, output data is
formed into 64-bit words-in the user chips of the user array 42 on
pins connected to the DOUT[00:63] nets. These nets, in turn,
connect to the output FIFO 74 (FIG. 8) that ultimately provides the
read data to the memory controller or the next MAP element 112 in
the chain. After forming the 64-bit result, the user circuitry must
ensure that a "FULL" signal is "low". When the signal is "low", the
transfer is started by providing a "low" from the user array 42 to
the control block 46 and the FIFO#WE input on the FIFO 74.
[0147] At the same time, valid data must appear on the data out
("DOUT") nets. This data must remain valid for 10 nanoseconds and
FIFO#WE must remain "low" until the end of this 10-nanosecond
period. If multiple words are to be transferred simultaneously, the
FIFO#WE input must remain "low" until the end of this 10-nanosecond
period as shown with particularity in FIG. 11B.
[0148] Output Timing
[0149] Three result words can be transferred out of the user array
42 before a "read" should occur to maximize the "read" bandwidth.
The output FIFO 74 (FIG. 8) is capable of holding 512 k words in
the embodiment illustrated. When three words are held in the
control block 46, the word counter in the status word will indicate
binary "11".
[0150] Pipeline Depth
[0151] To aid in system level operation, the user array 42 must
also provide the pipeline depth of the algorithm to the control
block 46. In a particular embodiment of the present invention, this
will be equal to the number of 100-MHz clock cycles required to
accept a data input word, process that data, and start the transfer
of the results to the FIFO 74.
[0152] If an algorithm is such that initialization parameters or
reference numbers are sent prior to actual operands, the pipeline
depth is equal only to the number of clock cycles required to
process the operands. This depth is provided as a static 8-bit
number on nets DOUT[64:71] from FPGAs 202 and/or 204 (FIG. 9). Each
of the eight bits are generally output from only of the FPGAs of
the user array 42 but the eight bits may be spread across both
chips.
[0153] In a particular embodiment of the present invention, the
ROMs that are used on the MAP elements 112 may be conveniently
provided as ATMEL.TM.AT17LVO1O in a 20-pin PLCC package. Each ROM
contains the configuration information for one of the four user
FPGAs of the user array 42. There may be eight or more ROM sockets
allocated to each of the user chips of the user array 42 to allow
selection of up to eight or more unique algorithms. In an
embodiment utilizing eight ROMs, the first ROM listed for each of
the four user chips may be selected by choosing configuration Oh
and the last ROM selected by choosing configuration 8h.
[0154] If all four user chips of the user array 42 are not needed
for an algorithm, the unused chips do not require that their ROM
sockets be populated. However, at least one of the user chips must
always contain a correctly programmed ROM even if it is not used in
the algorithm because signals related to the configuration timing
cycle are monitored by the control block. The user FPGA that
directly connects to both the DIN and DOUT signals, should always
be used first when locating the algorithm circuit.
[0155] With reference additionally now to FIG. 12, a simplified
illustration of a representative operating environment 300 for the
system and method of the present invention is shown including a
typical web site server 306 as would be replaced by, for example,
an SRC-6 reconfigurable server 308 (comprising, for example, the
multiprocessor computer 10 or computer system 20 of the preceding
figures) or other computer system incorporating one or more
industry standard processors together with one or more
reconfigurable processors having all of the processor controlled by
a single system image of the operating system. In this simplified
illustration, a number of personal computers 302 or other computing
devices are coupled to either the typical web site server 306 (in a
prior art implementation) or the reconfigurable sever 308 (in
accordance with the system and method of the present invention)
through the Internet 304.
[0156] With reference additionally now to FIG. 13, a flowchart is
shown illustrating a conventional data processing sequence 310 in a
conventional application of a typical web site server 306 as
depicted in the preceding figure. The sequence 310 begins with the
input of a number "N" of demographic data elements for processing
by the typical web site server 306. These N data elements are then
serially processed at step 314 until the last of the data elements
is determined and processed at decision step 316. Therefore, N
iterations by the microprocessor of the typical web site server 306
are required to complete processing of the input data elements.
[0157] Following this protracted data processing period, the
typical web site server 306 then can undertake to select the new
web page content specifically adapted to the particular web site
visitor at step 318, which updated site content is displayed at
step 320.
[0158] With reference additionally now to FIG. 14, a corresponding
flowchart is shown illustrating the processing of demographic or
other data utilizing the reconfigurable server 308 of FIG. 12 in a
significantly faster data processing sequence 330. The processing
sequence 330 again begins with the input of N demographic data
elements or other secure socket, database or other data for
processing by the site server at input step 332. Importantly, the
reconfigurable server 308 is now able to process the individual
data elements in parallel through the use of a single
reconfigurable processor, (such as a MAP element), due to its
ability to instantiate more than one processing unit that is
tailored to the job as opposed to reusing one or two processing
units located within a microprocessor. In the exemplary embodiment
shown, all of reconfigurable processors may share all of the
system's resources and be controlled by a single system image of
the operating system although, in alternative embodiments, cluster
management software may be utilized to effectively make a cluster
of microprocessors appear to a user to be but a single copy of the
operating system. In any event, the completion of steps 334.sub.1
through 334.sub.N requires only 1 iteration to prepare the site to
select the new content at step 336 and then display it at step
338.
[0159] While there have been described above the principles of the
present invention in conjunction with one or more specific
embodiments of the present invention and MAP elements, it is to be
clearly understood that the foregoing description is made only by
way of example and not as a limitation to the scope of the
invention. Particularly, it is recognized that the teachings of the
foregoing disclosure will suggest other modifications to those
persons skilled in the relevant art for use in processing differing
types of data at a web site. Such modifications may involve other
features which are already known per se and which may be used
instead of or in addition to features already described herein.
Although claims have been formulated in this application to
particular combinations of features, it should be understood that
the scope of the disclosure herein also includes any novel feature
or any novel combination of features disclosed either explicitly or
implicitly or any generalization or modification thereof which
would be apparent to persons skilled in the relevant art, whether
or not such relates to the same invention as presently claimed in
any claim and whether or not it mitigates any or all of the same
technical problems as confronted by the present invention. The
applicants hereby reserve the right to formulate new claims to such
features and/or combinations of such features during the
prosecution of the present application or of any further
application derived therefrom.
* * * * *