vliw architecture in dsp

/Width 38 Such an irregular processor poses many challenges in the construction of its compiler. VLIW PROCESSORS:A METHOD TO EXPLOIT INSTRUCTION LEVEL PARALLELISM • A VLIW processor is based on an architecture that implements Instruction Level Parallelism (ILP) means execution of multiple instructions at the same time. Common DSP features • Harvard architecture • Dedicated single-cycle Multiply-Accumulate (MAC) instruction (hardware MAC units) • Single-Instruction Multiple Data (SIMD) Very Large Instruction Word (VLIW) architecture • Pipelining • Saturation arithmetic • Zero overhead looping • Hardware circular addressing • Cache • DMA /Length 11 0 R Very-Long Instruction Word (VLIW) architectures are a suitable alternative for exploiting instruction-level parallelism (ILP) in programs, that is, for executing more than one basic (primitive) instruction at a time. H�\W�o��O��JW(��; ��uF�F� 7 However, still some special restrictions have to be obeyed in code generationfor VLIW DSPs. VLIW architectures can exploit instruction-level parallelism (ILP) in programs even if vector style data-level parallelism does not exist. A compiler based on Open64 was developed for this architecture. In parallel computing, the tasks are broken down into definite units. Very-Long Instruction Word (VLIW) architectures are a suitable alternative for exploiting instruction-level parallelism (ILP) in programs, that is, for executing more than one basic (primitive) instruction at a time. << Fixed Point Devices TMS320C62x DSP generation TMS320C64x DSP generation Floating point devices TMS320C67x DSP generation. We talk about the differences between VLIW and superscalar processes in relation to hardware and software complexity.. Multi-ported memory , VLIW architecture, Pipelining , Special Addressing modes in P- DSPs , On chip Peripherals, Computational accuracy in DSP processor, Von Neumann and Harvard Architecture, MAC UNIT 2 : ARCHITECTURE OF TMS320C5X (08) The C6713B device is based on the high-performance, advanced very-long-instruction-word (VLIW) architecture developed by Texas Instruments (TI), making this DSP an excellent choice for multichannel and multifunction applications. 1 1 1 rg 36 36 540 720 re f BT 563.25 42.75 TD 0 0 0 rg /F0 12 Tf 0 Tc 0 Tw (1) Tj -342 27.75 TD /F0 9.75 Tf 0.1138 Tc -0.0513 Tw (\251 1999 Berkeley Design Technology, Inc.) Tj 14.25 654.75 TD /F0 12 Tf -0.0637 Tc 0.3137 Tw (VLIW Architectures for DSP) Tj ET 1 1 1 rg 126 417.75 360 270 re f q 326.25 0 0 54.75 152.25 597.75 cm 0.502 0.502 0.502 rg BI ��+%dm�O��q׋�{']�U�TQ�^��fT""��`l�>�y��y��'��qW�� lѾ�>��}��tv��A� |��7D��$v�N�xzE'X�җ_�>�!��N ��$ž4v L��%"y��H��\�w�=,�0��E��bc�&��}.ټ� �@P��Yi��z!v�'E�/��1�=$��-�'� ��GG1p!��*�kd�ѷ�q�?ܯD �U��nq�r82b�ite� `��9?��1! 2"�zϺ2��c�[Pi�x�^��18�`��'�`�y\��]Rl�aO��HU�n�O�ļ��/ó��G�$��x��4Ѿ+'��{�o��2�~4 ��ǣowv��%��C'c��Z��'�g��gˇV��+� '>;9�9ti��N-�i��A1S Technology is removing the gap between embedded and VLIW computing: high-performance methods that seemed too costly for embedded use have become feasible … 1 Introduction The exponentially increasing performance and general-ity of superscalar processors has lead many to believe that Each unit is further divided into sets of instructions. VLIW processors. First, we explain the background and history behind VLIW and its difficulty of implementation. However, still some special restrictions have to be obeyed in code generationfor VLIW DSPs. Leveraging its advanced VLIW architecture, Texas Instruments Inc. has revamped its VelociTI platform to create a new 16-bit fixed-point DSP core known as the C64x. By Joseph A. Fisher, Paolo Faraboschi, Cliff Young; Morgan Kaufmann, 2004, ISBN 1558607668. ID �� ?�� ?�� ?��?��?��?�� ?�� ?�� Programmable VLIW and SIMD Architectures for DSP and Multimedia Applications Deepu Talla Laboratory for Computer Architecture Department of Electrical and Computer Engineering The University of Texas at Austin deepu@ece.utexas.edu Abstract – Digital Signal Processing (DSP) and multimedia workloads are expected to be %�� SAN JOSE, Calif. — Analog Devices, Lucent Technologies and Motorola Inc. have joined Texas Instruments Inc. in promoting a "post-VLIW" approach to digital signal processing that will nudge users into a brave new world of compilers and C-languag >> /BPC 1 (VLIW) processors. 7 0 obj /Height 28 grained parallelism of DSP applications is the very long instruction word (VLIW) architecture. Very Long Instruction Word (VLIW) Architectures 55:132/22C:160 High Performance Computer Architecture ... Statically scheduled ILP architecture. This paper presents an efficient motion-adaptive deinterlacing method based on edge-based liner average (ELA) and temporal adaptive interpolation. Whereas conventional central processing units mostly allow programs to specify instructions to execute in sequence only, a VLIW processor allows programs to explicitly specify instructions to execute in parallel. EI It is a concatenation of several short instructions and requires multiple execution units running in parallel, to carry out the instructions in a single cycle. << C6000 digital signal processor (DSP) family by Texas Instruments 4. Common DSP features • Harvard architecture • Dedicated single-cycle Multiply-Accumulate (MAC) instruction (hardware MAC units) • Single-Instruction Multiple Data (SIMD) Very Large Instruction Word (VLIW) architecture • Pipelining • Saturation arithmetic • Zero overhead looping • Hardware circular addressing • Cache • DMA The pixel in the missing field is classified into static and moving area. �t�i_Ҍѵ VLIW Introduction VLIW: Very Long Instruction Word (J.Fisher) multiple operations packed into one instruction each operation slot is for a fixed function constant operation latencies are specified architecture requires guarantee of: –parallelism within an instruction => no xoperation RAW check –no data use before data ready => no data interlocks Even after manual optimization of the VLIW code and insertion of SIMD and DSP instructions, the single-issue VIRAM processor is 60% faster than 5-way to 8-way VLIW designs. CEVA Inc. vliw在通用处理器上的失败，却在dsp领域获得了成功。根本原因是dsp特殊的应用场景正好发挥了vliw结构的优势，避开了它的短处。由于数字信号处理领域的算法比较单一稳定，同时是运算密集型程序，并不需要通用场景下的实时控制。 VLIW processors rely on software to identify the parallelism and assemble wide instruction packets. 1 Introduction The exponentially increasing performance and general-ity of superscalar processors has lead many to believe that TriMedia media processors by NXP (formerly Philips Semiconductors) 2. /ColorSpace 2 0 R /ColorSpace /DeviceRGB /H 73 /Width 137 /IM true The next segment concentrates on real-life examples of VLIW implementations. It is more difficult to program a parallel system than a single processor system, as the architecture of different parallel systems may vary, and the processes of multiple processors must be synchronized and coordinated. /Height 140 The Gen4 CEVA-XC unifies the principles of scalar and vector processing in a powerful architecture, enabling two-times 8-way VLIW and up to an unprecedented 14,000 bits of data level parallelism. %�� /BitsPerComponent 8 /W 435 VLIW Architecture. It 1.8GHz DSP architecture delivers 1,600 GOPS /Subtype /Image These instructions execute in parallel (simultaneously) on multiple CPUs. The Gen4 CEVA-XC unifies the principles of scalar and vector processing in a powerful architecture, enabling two-times 8-way VLIW and up to an unprecedented 14,000 bits of data level parallelism. endobj Department of ECE Laboratory for Computer Architecture SIMD Processors • Single Instruction Multiple Data • Exploit data parallelism as opposed to instruction parallelism in VLIW processors • A technique that has been added to general-purpose processors for DSP and multimedia processing > Intel’s MMX, Sun’s VIS, Motorola’s AltiVec Digital signal processing (DSP) and multimedia applications are expected to be the dominant workloads on future computer systems. %PDF-1.2 Very long instruction word or VLIW refers to a processor architecture designed to take advantage of instruction level parallelism This type of processor architecture is intended to allow higher performance without the inherent complexity of some other approaches. /H 73 Figure 2.3 shows the VLIW model architecture … In order to reduce the number of register ﬁle ports needed to provide data for multiple functional units /Filter /FlateDecode Very-Long Instruction Word (VLIW) Computer Architecture ABSTRACT VLIW architectures are distinct from traditional RISC and CISC architectures implemented in current mass-market microprocessors. /Length 13843 Even after manual optimization of the VLIW code and insertion of SIMD and DSP instructions, the single-issue VIRAM processor is 60% faster than 5-way to 8-way VLIW designs. The ManArray pro- Q 0.75 w 1 J 1 j 0 0 0 RG 201.75 655.5 m 191.25 654.75 l 181.5 653.25 l 172.5 651 l 165 647.25 l 158.25 643.5 l 153.75 639 l 150 633.75 l 149.25 628.5 l 150 622.5 l 153.75 617.25 l 158.25 612.75 l 165 609 l 172.5 605.25 l 181.5 603 l 191.25 601.5 l 201.75 600.75 l 422.25 600.75 l 432.75 601.5 l 442.5 603 l 451.5 605.25 l 459 609 l 465.75 612.75 l 470.25 617.25 l 474 622.5 l 474.75 628.5 l 474 633.75 l 470.25 639 l 465.75 643.5 l 459 647.25 l 451.5 651 l 442.5 653.25 l 432.75 654.75 l 422.25 655.5 l 201.75 655.5 l S BT 227.25 426.75 TD 0.3686 0.3412 0.3059 rg /F1 6.75 Tf 0.1097 Tc 0.1388 Tw (Copyright \251 1999 Berkeley Design Technology, Inc.) Tj 246.75 -6 TD 0.502 0.502 0.502 rg -0.003 Tc 0 Tw (1) Tj ET 437.25 432.75 28.5 21 re f q 28.5 0 0 -21 434.25 456.75 cm /im1 Do endstream Q q 326.25 0 0 54.75 149.25 600.75 cm 0.0471 0.0039 0.7137 rg BI The VLIW approach additionally enables designers to craft unique instructions and tailor the DSP core to their system needs. 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