CSC/ECE 506 Spring 2012/1c dm - Revision history

Mrshah2: /* Special-purpose systolic array */

2012-02-07T02:51:23Z

Special-purpose systolic array

← Older revision		Revision as of 02:51, 7 February 2012
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	An array of hardwired systolic processing elements tailored for a specific application. Typically, many tens or hundreds of cells fit on a single chip. One of the major applications of special-purpose systolic array is in matrix operations. [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_1.png Figure 6] illustrates the algorithm for the sum of a scalar product, computed in a single systolic element. Here, a’s and b’s are synchronously shifted through the processing element to be available for next element. These data synchronously exits the processing element unmodified for the next element. The sum of the products is then shifted out of the accumulator.		An array of hardwired systolic processing elements tailored for a specific application. Typically, many tens or hundreds of cells fit on a single chip. One of the major applications of special-purpose systolic array is in matrix operations. [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_1.png Figure 6] illustrates the algorithm for the sum of a scalar product, computed in a single systolic element. Here, a’s and b’s are synchronously shifted through the processing element to be available for next element. These data synchronously exits the processing element unmodified for the next element. The sum of the products is then shifted out of the accumulator.

	This principle easily extends to a matrix product as shown in [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_1.png Figure 7]. The only difference between single-element processing and array processing is that the latter delays each additional column and row by one cycle so that the columns and rows line up for a matrix multiply. The product matrix is shifted out after completion of processing.		This principle easily extends to a matrix product as shown in [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_1.png Figure 7] and [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic-array-for-matrix-multiplication.gif the animation] created with the help from the [http://www.iti.fh-flensburg.de/lang/papers/isa/isa2.htm link]. The only difference between single-element processing and array processing is that the latter delays each additional column and row by one cycle so that the columns and rows line up for a matrix multiply. The product matrix is shifted out after completion of processing.

	=====General-purpose systolic array=====		=====General-purpose systolic array=====

Dkarpur: /* The Flight Control System – MISD Example for fault tolerance */

2012-02-07T02:04:03Z

The Flight Control System – MISD Example for fault tolerance

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	A [http://en.wikipedia.org/wiki/Fly-by-wire Fly-By-Wire] system is used to replace the manual flight control by an electronic control interface. The movements of the flight control in the cockpit are converted to electronic signals and are transmitted to the actuators by wires. The control computers use the feedback from the sensors to compute and control the movement of the actuators to provide the expected response. These computers also perform the task to stabilize the aircraft and perform other tasks without the knowledge of the pilot. Flight control systems must meet extremely high levels of accuracy and functional integrity.		A [http://en.wikipedia.org/wiki/Fly-by-wire Fly-By-Wire] system is used to replace the manual flight control by an electronic control interface. The movements of the flight control in the cockpit are converted to electronic signals and are transmitted to the actuators by wires. The control computers use the feedback from the sensors to compute and control the movement of the actuators to provide the expected response. These computers also perform the task to stabilize the aircraft and perform other tasks without the knowledge of the pilot. Flight control systems must meet extremely high levels of accuracy and functional integrity.

	There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. [[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig14.png\|thumb\|right\|250px\|~~Figure 14:~~ Figure 14: PFC with instruction and data streams]]		There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. [[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: PFC with instruction and data streams]]

	====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====		====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====

Dkarpur: /* The Flight Control System – MISD Example for fault tolerance */

2012-02-07T02:03:31Z

The Flight Control System – MISD Example for fault tolerance

← Older revision		Revision as of 02:03, 7 February 2012
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	A [http://en.wikipedia.org/wiki/Fly-by-wire Fly-By-Wire] system is used to replace the manual flight control by an electronic control interface. The movements of the flight control in the cockpit are converted to electronic signals and are transmitted to the actuators by wires. The control computers use the feedback from the sensors to compute and control the movement of the actuators to provide the expected response. These computers also perform the task to stabilize the aircraft and perform other tasks without the knowledge of the pilot. Flight control systems must meet extremely high levels of accuracy and functional integrity.		A [http://en.wikipedia.org/wiki/Fly-by-wire Fly-By-Wire] system is used to replace the manual flight control by an electronic control interface. The movements of the flight control in the cockpit are converted to electronic signals and are transmitted to the actuators by wires. The control computers use the feedback from the sensors to compute and control the movement of the actuators to provide the expected response. These computers also perform the task to stabilize the aircraft and perform other tasks without the knowledge of the pilot. Flight control systems must meet extremely high levels of accuracy and functional integrity.

	There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed~~. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted~~.[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]		There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. [[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]
	[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]

	====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====		====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====

Dkarpur: /* The Flight Control System – MISD Example for fault tolerance */

2012-02-07T02:00:53Z

The Flight Control System – MISD Example for fault tolerance

← Older revision		Revision as of 02:00, 7 February 2012
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	There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]		There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]
			[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]

	~~[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]~~
	====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====		====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====

Dkarpur: /* Multiple Processors Implementation in Boeing 777http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" */

2012-02-07T01:59:42Z

Multiple Processors Implementation in Boeing 777http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer"

← Older revision		Revision as of 01:59, 7 February 2012
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	There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]		There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]

			[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]
	====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====		====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====

	~~[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]~~
	In modern computers, the redundant flight control computations are carried out by multiprocessor systems. The triple redundant 777 primary flight computer, has the architecture as shown in [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Fig13.png Figure 13].		In modern computers, the redundant flight control computations are carried out by multiprocessor systems. The triple redundant 777 primary flight computer, has the architecture as shown in [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Fig13.png Figure 13].

Dkarpur: /* The Flight Control System – MISD Example for fault tolerance */

2012-02-07T01:59:21Z

The Flight Control System – MISD Example for fault tolerance

← Older revision		Revision as of 01:59, 7 February 2012
Line 139:		Line 139:
	A [http://en.wikipedia.org/wiki/Fly-by-wire Fly-By-Wire] system is used to replace the manual flight control by an electronic control interface. The movements of the flight control in the cockpit are converted to electronic signals and are transmitted to the actuators by wires. The control computers use the feedback from the sensors to compute and control the movement of the actuators to provide the expected response. These computers also perform the task to stabilize the aircraft and perform other tasks without the knowledge of the pilot. Flight control systems must meet extremely high levels of accuracy and functional integrity.		A [http://en.wikipedia.org/wiki/Fly-by-wire Fly-By-Wire] system is used to replace the manual flight control by an electronic control interface. The movements of the flight control in the cockpit are converted to electronic signals and are transmitted to the actuators by wires. The control computers use the feedback from the sensors to compute and control the movement of the actuators to provide the expected response. These computers also perform the task to stabilize the aircraft and perform other tasks without the knowledge of the pilot. Flight control systems must meet extremely high levels of accuracy and functional integrity.

	There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.		There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]
	[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]

	====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====		====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====

Dkarpur: /* The Flight Control System – MISD Example for fault tolerance */

2012-02-07T01:58:57Z

The Flight Control System – MISD Example for fault tolerance

← Older revision		Revision as of 01:58, 7 February 2012
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	There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.		There are redundant flight control computers present in the flight control system. If one of the flight-control computers crashes, gets damaged or is affected by electromagnetic pulses, the other computer can overrule the faulty one and hence the flight of the aircraft is unharmed. The number of redundant flight control computers is generally more than two, so that any computer whose results disagree with the others is ruled out to be faulty and is either ignored or rebooted.
			[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]

	====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====		====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====

Dkarpur: /* Multiple Processors Implementation in Boeing 777http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" */

2012-02-07T01:58:45Z

Multiple Processors Implementation in Boeing 777http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer"

← Older revision		Revision as of 01:58, 7 February 2012
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	====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====		====Multiple Processors Implementation in Boeing 777<ref>http://www.citemaster.net/getdoc/8767/R8.pdf Y.C. (Bob) Yeh, Boeing Commercial Airplane Group, "Triple-Triple Redundant 777 Primary Flight Computer" </ref>====
	~~[[Image:fig13.png\|thumb\|right\|250px\|Figure 13: Architecture of triple redundant 777 primary flight computer [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#cite_note-7 6]]]~~
	[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]		[[Image:fig14.png\|thumb\|right\|250px\|Figure 14: Figure 14: PFC with instruction and data streams]]
	In modern computers, the redundant flight control computations are carried out by multiprocessor systems. The triple redundant 777 primary flight computer, has the architecture as shown in [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Fig13.png Figure 13].		In modern computers, the redundant flight control computations are carried out by multiprocessor systems. The triple redundant 777 primary flight computer, has the architecture as shown in [http://expertiza.csc.ncsu.edu/wiki/index.php/File:Fig13.png Figure 13].

Dkarpur: /* Programmable Systolic Array */

2012-02-07T01:57:51Z

Programmable Systolic Array

← Older revision		Revision as of 01:57, 7 February 2012
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	The workstation downloads a program to each MISD ([http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_4.png Figure 9]) systolic cell. Each cell may be loaded with a different program, or all the cells in the array may be loaded with the same program. Each cell's architecture is somewhat similar to the conventional [http://en.wikipedia.org/wiki/Von_Neumann_model von Neumann architecture]: It contains a control unit, an ALU, and local memory. MIMD systolic cells have more local memory than their SIMD counterparts to support the von Neumann-style organization.		The workstation downloads a program to each MISD ([http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_4.png Figure 9]) systolic cell. Each cell may be loaded with a different program, or all the cells in the array may be loaded with the same program. Each cell's architecture is somewhat similar to the conventional [http://en.wikipedia.org/wiki/Von_Neumann_model von Neumann architecture]: It contains a control unit, an ALU, and local memory. MIMD systolic cells have more local memory than their SIMD counterparts to support the von Neumann-style organization.

	This architecture is defined as Multiple Instruction Multiple Data (MIMD) architecture in ~~<ref>~~http://home.engineering.iastate.edu/~zambreno/classes/cpre583/documents/JohHur93A.pdf~~</ref>~~. The architecture has multiple instruction streams for the PEs and a single data stream passing through all the PEs. Thus, it can also be defined as Multiple Instruction Single Data (MISD) architecture. The architecture of Systolic array configuration are controversial as explained in the [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#Architecture_of_systolic_arrays_as_against_MISD_architecture section 4.1.2.]		This architecture is defined as Multiple Instruction Multiple Data (MIMD) architecture in [http://home.engineering.iastate.edu/~zambreno/classes/cpre583/documents/JohHur93A.pdf 5]. The architecture has multiple instruction streams for the PEs and a single data stream passing through all the PEs. Thus, it can also be defined as Multiple Instruction Single Data (MISD) architecture. The architecture of Systolic array configuration are controversial as explained in the [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#Architecture_of_systolic_arrays_as_against_MISD_architecture section 4.1.2.]

	=====Reconfigurable Systolic Array=====		=====Reconfigurable Systolic Array=====

Dkarpur: /* Programmable Systolic Array */

2012-02-07T01:55:51Z

Programmable Systolic Array

← Older revision		Revision as of 01:55, 7 February 2012
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	The workstation downloads a program to each MISD ([http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_4.png Figure 9]) systolic cell. Each cell may be loaded with a different program, or all the cells in the array may be loaded with the same program. Each cell's architecture is somewhat similar to the conventional [http://en.wikipedia.org/wiki/Von_Neumann_model von Neumann architecture]: It contains a control unit, an ALU, and local memory. MIMD systolic cells have more local memory than their SIMD counterparts to support the von Neumann-style organization.		The workstation downloads a program to each MISD ([http://expertiza.csc.ncsu.edu/wiki/index.php/File:Systolic_4.png Figure 9]) systolic cell. Each cell may be loaded with a different program, or all the cells in the array may be loaded with the same program. Each cell's architecture is somewhat similar to the conventional [http://en.wikipedia.org/wiki/Von_Neumann_model von Neumann architecture]: It contains a control unit, an ALU, and local memory. MIMD systolic cells have more local memory than their SIMD counterparts to support the von Neumann-style organization.

	This architecture is defined as Multiple Instruction Multiple Data (MIMD) architecture in <ref>http://~~www~~.~~bukisa~~.~~com~~/~~articles~~/~~13059_supercomputer-evolution~~</ref>. The architecture has multiple instruction streams for the PEs and a single data stream passing through all the PEs. Thus, it can also be defined as Multiple Instruction Single Data (MISD) architecture. The architecture of Systolic array configuration are controversial as explained in the [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#Architecture_of_systolic_arrays_as_against_MISD_architecture section 4.1.2.]		This architecture is defined as Multiple Instruction Multiple Data (MIMD) architecture in <ref>http://home.engineering.iastate.edu/~zambreno/classes/cpre583/documents/JohHur93A.pdf</ref>. The architecture has multiple instruction streams for the PEs and a single data stream passing through all the PEs. Thus, it can also be defined as Multiple Instruction Single Data (MISD) architecture. The architecture of Systolic array configuration are controversial as explained in the [http://expertiza.csc.ncsu.edu/wiki/index.php/CSC/ECE_506_Spring_2012/1c_dm#Architecture_of_systolic_arrays_as_against_MISD_architecture section 4.1.2.]

	=====Reconfigurable Systolic Array=====		=====Reconfigurable Systolic Array=====