DESIGN & IMPLEMENTATION OF SYSTOLIC ARRAY ARCHITECTURE
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1 International Journal of Electrical and Electronics Engineering Research (IJEEER) ISSN X Vol. 3, Issue 4, Oct 2013, TJPRC Pvt. Ltd. DESIGN & IMPLEMENTATION OF SYSTOLIC ARRAY ARCHITECTURE SWETA SINGH 1 & N B SINGH 2 1 Worked on M.Tech (VLSI Design), CSIR-CEERI, Banasthali Vidyapeeth University, Vanasthali, Rajasthan, India 2 Chief Scientist, MEMS MS & RF ICs Design, CSIR-Central Electronics Engineering Research Institute (CEERI), Pilani, Rajasthan, India ABSTRACT The paper describes the implementation of 2-D systolic array matrix multiplier architecture in RTL using one dimensional array to target the design on a appropriate FPGA/PROM/CPLD devices. It also discusses the digital realisation of a binary multiplier. The system development started with top-down planning approach and the blocks were designed using bottom-up implementation. The programs were written, simulated and synthesized using Mentor Graphics tools, ModelSim and Leonardo Spectrum. Results are presented in the paper. The design presented in the paper is an integral part of the higher level efficient systolic architecture. KEYWORDS: Systolic Array, DSP, Verilog and HDL INTRODUCTION A Parallel Algorithm [5], is an algorithm which can be executed a piece at a time on many different processing devices, and then put back together again at the end to get the correct result. Parallel algorithms[8], are valuable because of substantial improvements in multiprocessing systems and the rise of multi-core processors. In general, it is easier to construct a computer with a single fast processor than one with many slow processors with the same throughput. But processor speed is increased primarily by shrinking the circuitry, and modern processors are pushing physical size and heat limits. These twin barriers have flipped the equation, making multiprocessing practical even for small systems. Modelling parallel algorithm is more complicated than modelling sequential algorithm because in practice parallel computers tend to vary more in organization than do sequential computers. As a consequence, a large portion of the research on parallel algorithms has gone into the question of modelling, Although there has been no consensus on the right model, this research has yielded a better understanding of the relationship between the models. Any discussion of parallel algorithms requires some understanding of the various models and the relationship among them. In many situations, hardware description languages (HDL) such as VHDL, Verilog or SystemC is used to develop the functionality of the digital system, while the timing and control signal generation is either neglected or ignored. I have used a methodology wherein a hardware structure was conceptually laid out of the digital system under consideration. The system development started with top-down planning approach and the blocks were designed using bottom-up implementation. The programs were written, simulated and synthesized using Electronic Data Automation (EDA) tools such as ModelSim and Leonardo Spectrum. Instruction set such as transfer, arithmetic, logic, input, output and control instructions were implemented.. Flynn's taxonomy is a classification of computer architectures, proposed by Michael J. Flynn in According to Flynn s taxonomy parallelism can be established by using one of these models, SISD has no parallelism. It is used in sequential computing system
2 118 Sweta Singh & N B Singh SIMD establishes data parallelism. MISD establishes instructions parallelism. MIMD establishes both data and instructions parallelism. Flynn s taxonomy distinguishes multi-processor computer architectures according to how they can be classified along the two independent dimensions of Instruction and Data. Each of these dimensions can have only one of two possible states: Single or Multiple. The matrix below defines the 4 possible classifications according to Flynn: Figure 1: Flynn s Taxonomy Classifications From scalar to superscalar, the simplest processors are scalar processors. Each instruction executed by a scalar processor typically manipulates one or two data items at a time. By contrast, each instruction executed by a vector processor operates simultaneously on many data items. An analogy is the difference between scalar and vector arithmetic. A superscalar processor is sort of a mixture of the two. Each instruction processes one data item, but there are multiple redundant functional units within each CPU thus multiple instructions can be processing separate data items concurrently. A superscalar architecture where a processor having multi functional units can be realized to execute multi instructions in a single control step to redundant functional units on the processor when it is also integrated with pipeline features then it maintains its enhanced feature. Superscalar has the redundant resources. Existing binary executable programs have varying degrees of intrinsic parallel During the project above classified models will be included to establish the architecture for the parallel processor. The applications may be the parallel ALU and array processors, i.e. systolic array architecture. Most of today s algorithms are sequential, they specify a sequence of steps in which each step consists of a single operation. These algorithms are well suited to today s computers, which basically perform operations in a sequential fashion. Although the speed at which sequential computers operate has been improving at an exponential rate for many years, the improvement is now coming at greater and greater cost. As a consequence, researchers have sought more costeffective improvements by building parallel computers that perform multiple operations in a single step. In order to solve a problem efficiently on a parallel machine, it is usually necessary to design an algorithm that specifies multiple operations on each step, i.e., a parallel algorithm. As an example, consider the problem of computing the sum of a sequence A of n numbers. The standard algorithm computes the sum by making a single pass through the sequence, keeping running sum of the numbers seen so far. It is not difficult however, to devise an algorithm for computing the sum that performs many operations in parallel. For example, suppose that, in parallel, each element of A with an even index is paired and summed with the next element of A, which has an odd index, i.e., A[0] is paired with A[1], A[2] with A[3], and so on. The result is a new sequence of [n/2] numbers that sum to the same value as the sum that is wish to compute. This pairing and summing
3 Design & Implementation of Systolic Array Architecture 119 step can be repeated until, after [log 2 n] steps, a sequence consisting of single value is produced, and this value is equal to the final sum. The parallelism in an algorithm can yield improved performance on many deferent kinds of computers. For example, on a parallel computer, the operations in a parallel algorithm can be performed simultaneously by deferent processors. Furthermore, even on a single-processor computer the parallelism in an algorithm can be exploited by using multiple functional units, pipelined functional units, or pipelined memory systems. Thus, it is important to make a distinction between the parallelism in an algorithm and the ability of any particular computer to perform multiple operations in parallel. Of course, in order for a parallel algorithm to run efficiently on any type of computer, the algorithm must contain at least as much parallelism as the computer, for other-wise resources would be left idle. Unfortunately, the converse does not always hold: some parallel computers cannot efficiently execute all algorithms, even if the algorithms contain a great deal of parallelism. Experience has shown that it is more difficult to build a general-purpose parallel machine than a general-purpose sequential machine. OBJECTIVE(S) AND SCOPE Systolic array has been modelled in Verilog Hardware Description Language, which is small integral part of for full search block matching algorithm (FSBMA) for motion estimation and compensation [10-11], which leads to video sequence compression is realized using systolic array architectures. The objective of working on this project is to implement 2D systolic array in which 3*3 matrix multiplications can be performed. It is used in FSBMA. A large number of systolic array designs have been developed and used to perform a broad range of computations. In fact, recent advances in theory and software have allowed some of these systolic arrays to be derived automatically. The following is a representative list of computations for which systolic designs exist. Signal and Image Processing: Digital filters, convolution and correlation, discrete Fourier transform, fast Fourier transform (FFT--q.v.), encoding/ decoding for compression. Matrix Arithmetic: Matrix multiplication, solution of linear systems of equations, solution of Toeplitz linear systems, QR-decomposition, least-squares computation, singular value decomposition, eigenvalue computation, etc. Technology Used To model 2D systolic array matrix multiplication ModelSim is used for compilation and simulation. Leonardo Spectrum is used to obtain Synthesis Report, RTL implementation as well as to View Technology for Xilinx Virtex-II Pro FPGA, PROM & CPLD devices. METHODOLOGY The Systolic Array [1-4] is this design in an integral part of the main processor. The Systolic portion of the Processor is treated as an array of ALUs and it is controlled in very much the same way as a Scalar ALU[6-7]. Systolic arrays are a family of parallel computer architectures capable of using a very large number of processors simultaneously for important computations in applications such as scientific computing and signal processing. This article gives a general description of systolic arrays, illustrates the idea by two simple examples, lists some applicable computations, and describes fine-grain inter processor communication in systolic arrays. Systolic arrays are suited for processing repetitive computations. Although this kind of computation usually
4 120 Sweta Singh & N B Singh requires a great deal of computing power, such computations are highly regular and parallelizable. The systolic array architecture exploits this regularity and parallelism to deliver the required computational speed. Being able to perform many operations simultaneously is just one of the many advantages of systolic arrays. Other advantages include modular expandability of the cell array, simple and regular data and control flows, simple and uniform cells, efficient fault-tolerant schemes, and nearest-neighbor data communications. These properties are highly desirable for VLSI (Very Large-Scale Integration) implementations. Indeed, the advances in VLSI technology have been a major motivation for much interest in systolic arrays. A systolic array is an arrangement of processors in an array where data flows synchronously across the array between neighbours, usually with different data flowing in different directions[9]. Each processor at each step takes in data from one or more neighbours (e.g. North and West), processes it and, in the next step, outputs results in the opposite direction (South and East). Systolic arrays are specialized form of parallel computing, where processors connected by short wires. An example of two dimensional systolic array is given in the Figure 2 given below. Figure 2: Architecture of Systolic Array [9] The array given above takes in inputs parallel performs parallel processing and outputs the result. Systolic arrays do not lost their speed duo to their connection unlike any other parallelism. Cells i.e. Processing Elements (PE), compute data and store it independently of each other. Each cell (PE) is an independent processor and has some registers and Arithmetic and Logic Units (ALUs). The cells (Processing Elements) share information with their neighbours, after performing the needed operations on the data. For example, when multiplying two 3*3 matrix we need N 3 operations according to the given formula: For I = 1 to 3 For J = 1 to 3 For K = 1 to 3 P[I,J] = P[I,J] + A[J,K] * B[K,J]; End End End But using systolic arrays [9] it can be done in only 9 clock pulses.
5 Design & Implementation of Systolic Array Architecture 121 Figure 3: 3x3 Systolic Array Architecture [9] Example of Systolic Array is shown in the Figure 3 above. Here each cell takes in inputs from top and left, multiplies those two number and stores in the local register which is inside the each Processing Element. After 9 clock pulses the result would be stored in each processing elements. In the full search block matching it needs N2 subtractions, N2 magnitude operations and N2 magnitude accumulations are needed. Hence systolic arrays can be used to perform these operations duo to its advantageous properties like regularity, modularity and local communication. The value of each cell which is stored in local register can be given as follows P 1 = a 11 b 11 + a 12 b 21 + a 13 b 31 P 2 = a 11 b 12 + a 12 b 22 + a 13 b 32 P 3 = a 11 b 13 + a 12 b 23 + a 13 b 33 P 4 = a 21 b 11 + a 22 b 21 + a 23 b 31 P 5 = a 21 b 12 + a 22 b 22 + a 23 b 32 P 6 = a 21 b 13 + a 22 b 23 + a 23 b 33 P 7 = a 31 b 11 + a 32 b 21 + a 33 b 31 P 8 = a 31 b 12 + a 32 b 22 + a 33 b 32 P 9 = a 31 b 13 + a 32 b 23 + a 33 b 33 SYSTOLIC ARRAY ARCHITECTURE IMPLEMENTATION Table 1: Operation Executed w.r.t. Clock Performed on Systolic Array Clock Steps P 1 P 2 P 3 P 4 P 5 P 6 P 7 P 8 P a 11 b a 12 b 21 a 11 b 12 - a 21 b a 13 b 31 a 12 b 22 a 11 b 13 a 22 b 21 a 21 b 12 - a 31 b a 13 b 32 a 12 b 23 a 23 b 31 a 22 b 22 a 21 b 13 a 32 b 21 a 31 b a 13 b 33 - a 23 b 32 a 22 b 23 a 33 b 31 a 32 b 22 a 31 b a 23 b 33 - a 33 b 32 a 32 b a 33 b In this operation, A and B are two 8bit inputs and P is the output. Their sequence of appearing A and B are shown in the form of a and b respectively. A = (a33a32a31a23a22a21a13a12a11), B = (b33b32b31b23b22b21b13b12b11) Where, A = ( ) B = ( ) P = ( )
6 122 Sweta Singh & N B Singh Table 2: 3x3 Systolic Array Stepwise Simulation Results Clock Steps P 1 P 2 P 3 P 4 P 5 P 6 P 7 P 8 P Sum C out Figure 4: 3x3 Systolic Array System View by M.G. Leonardo Spectrum Synthesis Resources Summary: ******************************************************* Cell: systolic3x View: INTERFACE Library: work ******************************************************* Number of global buffers used: 1 Total Accumulated Area Number of BUFGP 1 Number of Dffs or Latches 9 Number of Function Generators 61 Number of IBUF 18 Number of OBUF 9 Number of accumulated instances 98 Number of ports 28 Number of nets 117 Number of instances 98 Number of references to this view 0 Cell Library References Total Area BUFGP xcv2p 1 x 1 1 BUFGP FD xcv2p 9 x 1 9 Dffs or Latches IBUF xcv2p 18 x 1 18 IBUF LUT2 xcv2p 11 x 1 11 Function Generators LUT3 xcv2p 7 x 1 7 Function Generators LUT4 xcv2p 43 x 1 43 Function Generators OBUF xcv2p 9 x 1 9 OBUF xcv2p - - xcv2p - - *************************************** Device Utilization for 2VP2fg256 ***************************************
7 Design & Implementation of Systolic Array Architecture 123 Resource Used Avail Utilization IOs % Global Buffers % Function Generators % CLB Slices % Dffs or Latches % Block RAMs % Block Multipliers % Using wire table: xcv2p-2-7_wc Clock Frequency Report Clock : Frequency clk : 71.8 MHz Figure 5: 3x3 Systolic Array Schematic Interface_XRTL View Figure 6: 3x3 Systolic Array Technology Schematic here, X = ( ) Y = ( ) Z = XxY = ( )
8 124 Sweta Singh & N B Singh Figure 7: 3x3 Systolic Array System Simulation Window 5. 9bit*9bit Binary Multiplier Implementation: Mentor Graphics Leonardo Spectrum Synthesis Report for 9x9 Binary Multiplier RTL Design. Figure 8: 9x9 Bit Binary 1-d Array Efficient Multiplier Technology View X = (x8 x7 x6 x5 x4 x3 x2 x1 x0) and Y = (y8 y7 y6 y5 y4 y3 y2 y1 y0) Z= X*Y Synthesis Summary Report: ******************************************************* Cell: bin_mult_9bit View: INTERFACE Library: work ******************************************************* Total Accumulated Area Number of Function Generators 219 Number of IBUF 18 Number of MUXF5 5 Number of OBUF 18 Number of accumulated instances 260 Number of ports 37 Number of nets 278 Number of instances 260 Number of references to this view 0 Cell Library References Total Area IBUF xcv2p 18 x 1 18 IBUF LUT2 xcv2p 49 x 1 49 Function Generators LUT3 xcv2p 12 x 1 12 Function Generators LUT4 xcv2p 158 x Function Generators MUXF5 xcv2p 5 x 1 5 MUXF5 OBUF xcv2p 18 x 1 18 OBUF
9 Design & Implementation of Systolic Array Architecture 125 Number of global buffers used: 0 *********************************************** Device Utilization for 2VP2fg256 *********************************************** Resource Used Avail Utilization IOs % Global Buffers % Function Generators % CLB Slices % Dffs or Latches % Block RAMs % Block Multipliers % Using wire table: xcv2p-2-7_wc Figure 9: 9x9 Bit Binary 1-d Array Multiplier Interface_XRTL Schematic View Figure 10: 9x9 Bit Binary 1-d Array Multiplier Technology Schematic View A = (a8 a7 a6 a5 a4 a3 a2 a1 a0) and B = (b8 b7 b6 b5 b4 b3 b2 b1 b0) A = ( ) and B = ( ) P= A*B = ( )
10 126 Sweta Singh & N B Singh Table 3: Partial Product of Multiplier Pi Expressions Values Pi* Pi P0 a0b P1 a0b1+a1b P2 a0b2+a1b1+a2b P3 a0b3+a1b2+a2b1+a3b P4 a0b4+a1b3+a2b2+a3b1+a4b P5 a0b5+a1b4+a2b3+a3b2+a4b1+a5b P6 a0b6+a1b5+a2b4+a3b3+a4b2+a5b a6b p7 a0b7+a1b6+a2b5+a3b4+a4b3+a5b P8 P9 P10 P11 2+a6b1+a7b0 a0b8+a1b7+a2b6+a3b5+a4b4+a5b 3+a6b2+a7b1+a8b0 a1b8+a2b7+a3b6+a4b5+a5b4+a6b 3+a7b2+a8b1 a2b8+a3b7+a4b6+a5b5+a6b4+a7b 3+a8b2 a3b8+a4b7+a5b6+a6b5+a7b4+a8b P12 a4b8+a5b7+a6b6+a7b5+a8b P13 a5b8+a6b7+a7b6+a8b P14 a6b8+a7b7+a8b P16 a7b8+a8b P17 a8b Where, Pi* = P i+2,i+1,i = P i + C i-1 and Pi is the Partial Products of the binary multiplier. Here, X = ( ) Y = ( ) Z = X*Y = Figure 11: Binary Multiplier System Simulation Window CONCLUSIONS Implementation of efficient two-dimensional Systolic Array Matrix Multiplication and Binary Multiplier in MAC architecture using one dimensional input and output arrays were presented in the paper, its realisation is carried out in Verilog and the simulation results presented in the simulation window of Modelsim, post synthesis simulation is also performed. Synthesis reports were also included in the paper. Parallel architecture simulation is performed in HDL using fork and join statements for parallel ALU operations in verilog.
11 Design & Implementation of Systolic Array Architecture 127 REFERENCES 1. Lang, T., and Moreno, J. H. "Matrix Computations on Systolic-type Meshes," Computer, 23, 4 (April), 32-51,1990. Begins with an excellent tutorial on systolic parallel processing. 2. Quinton, P., Robert, Y., and Craig, I. Systolic Algorithms & Architectures. Upper Saddle River, NJ; Prentice Hall Evans, D. J. (ed.) Systolic Algorithms. London: Gordon & Breach. 3. Gruska, J. Systolic Computation. New York: Springer-Verlag Megson, G. M. An Introduction to Systolic Algorithm Design. Oxford: Oxford Science Publications. 4. Moreno, J. H., and Lang, T. Matrix Computations on Systolic-Type Arrays. 1992, New York:, Kluwer-Academic Press. 5. Petkov, N. Systolic Parallel Processing, 1993, Amsterdam: North-Holland. 6. Jan M. Rabaey, Digital Integrated Circuits. Prentice-Hall of India 7. Douglas A. Pucknell, and Kamran Eshraghian, Basic VLSI Design. Third edition, PHI Jonathan Break, Systolic Arrays & Their Applications, courses/ cot4810/fall04/ presentations/systolic_arrays.ppt. 10. Mohammad Mahdi Azadfar, Implementation of A Optimized Systolic Array Architecture for FSBMA using FPGA for Real-time Applications, IJCSNS International Journal of Computer Science and Network Security, VOL.8 No.3, March ITU-T H.264/Advanced video coding for generic audio visual Services, Infrastructure of audiovisual services Coding of moving video ITU-T Recommendation H.264,2005
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