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Proceedings Sixteenth Conference on Advanced Research in VLSI

27-29 March 1995

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  • Proceedings. Sixteenth Conference on Advanced Research in VLSI

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (171 KB)
    Freely Available from IEEE
  • Author index

    Publication Year: 1995
    Request permission for commercial reuse | PDF file iconPDF (51 KB)
    Freely Available from IEEE
  • Energy recovery for low-power CMOS

    Publication Year: 1995, Page(s):415 - 429
    Cited by:  Papers (11)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    Energy recovery, as a means to trade off power dissipation for performance in CMOS logic circuits, is analyzed and investigated. A mathematical model is presented to estimate the efficiency for two energy-recovery approaches under varying conditions of voltage swing, transition time, and MOS device parameters. This model can be directly compared to the well-known model for supply-voltage scaling, ... View full abstract»

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  • Single-transistor transparent-latch clocking

    Publication Year: 1995, Page(s):331 - 341
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    We propose a single-phase clocking scheme for CMOS VLSI designs in which the traditional master-slave data-latches are replaced with transparent-latches where each transparent-latch is implemented using a single NMOS transistor. The clocking scheme places a constraint on the allowable width of the clock pulses which can be satisfied by a clock driver that is integrated with a dynamic buffer. Our e... View full abstract»

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  • HAL: heuristic algorithms for layout synthesis

    Publication Year: 1995, Page(s):185 - 199
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    This paper describes graph theory based algorithms for layout synthesis of leaf cells. A new layout style termed 1-1/2-d layout style is used for the layouts. The transistors are aligned based on common poly gates or common circuit nodes between two sets of transistors. The two sets of transistors can be a set of PMOS transistors and a set of NMOS transistors, or both the sets can be formed by sim... View full abstract»

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  • Non-dissipative rail drivers for adiabatic circuits

    Publication Year: 1995, Page(s):404 - 414
    Cited by:  Papers (12)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    Energy dissipation of CMOS circuits is becoming a major concern in the design of digital systems. Earlier, we presented a new form of CMOS charge recovery logic (SCRL), with an energy dissipation per operation that falls linearly with operating frequency, as opposed to the constant energy required for conventional CMOS circuits. These SCRL circuits, along with most adiabatic circuit techniques pro... View full abstract»

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  • Distributed synchronous clocking

    Publication Year: 1995, Page(s):316 - 330
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    It is difficult to distribute a well aligned hardware clock throughout the physical extent of a synchronous processor. In this paper, we present an alternative approach-Distributed Synchronous Clocking-that maintains the simplicity of synchronous operation without suffering the drawbacks of centralized clocking. A network of independent oscillators takes the place of the centralized clock source, ... View full abstract»

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  • Analog VLSI circuits for manufacturing inspection

    Publication Year: 1995, Page(s):241 - 255
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    We present three types of analog VLSI circuits that can be used in manufacturing inspection systems. The first set of circuits performs an adaptive threshold of an input image. The second circuit uses morphological operations with programmable structuring elements to detect oriented edges. Both of these circuits can be used as high speed preprocessors for visual inspection of manufacturing process... View full abstract»

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  • Recursive layout generation

    Publication Year: 1995, Page(s):172 - 184
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1044 KB)

    We present a recursive method for generating layout for VLSI chips based on integrating layout directives in the netlist description. The method allows seamless integration of hand-drawn and synthesized layout, so that hand layout need only be used where the increase in density is justified. Layout is generated automatically with predictable results; small changes in the source result in small cha... View full abstract»

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  • Quasi-algebraic decompositions of switching functions

    Publication Year: 1995, Page(s):358 - 367
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    Brayton (1982-90) and others have developed a rich theory of decomposition of switching functions based on algebraic manipulations of monomials. In this theory, a product g(Xg)·h(Xh ) is algebraic if Xg∩Xh=Ø. There are efficient methods for determining if a function has an algebraic product. If a function does not have an algebraic prod... View full abstract»

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  • Code density optimization for embedded DSP processors using data compression techniques

    Publication Year: 1995, Page(s):272 - 285
    Cited by:  Papers (43)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    We address the problem of code size minimization in VLSI systems with embedded DSP processors. Reducing code size reduces the production cost of embedded systems. We use data compression methods to develop code size minimization strategies. We present a framework for code size minimization where the compressed data consists of a dictionary and a skeleton. The dictionary can be computed using popul... View full abstract»

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  • An evaluation of bipartitioning techniques

    Publication Year: 1995, Page(s):383 - 402
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1188 KB)

    Logic partitioning is an important issue in VLSI CAD, and has been an active area of research for at least the last 25 years. Numerous approaches have been developed and many different techniques have been combined for a wide range of applications. In this paper, we examine many of the existing techniques for logic bipartitioning and present a methodology for determining the best mix of approaches... View full abstract»

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  • Low-latency plesiochronous data retiming

    Publication Year: 1995, Page(s):304 - 315
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A new method of retiming plesiochronous data is described. This method features latency of less than a cell-time and requires only minimal support circuitry. No flow control or handshaking signals are used, allowing true undirectional signalling between transmitter and receiver. Application areas include communication networks in parallel computers, and general communication network repeaters, hub... View full abstract»

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  • A 590,000 transistor 48,000 pixel, contrast sensitive, edge enhancing, CMOS imager-silicon retina

    Publication Year: 1995, Page(s):225 - 240
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    We present an experimental analog VLSI focal plane processor for the phototransduction, local gain control and edge enhancement of natural images. The single chip system incorporates 590,000 transistors in 48,000 pixels, and it has been fabricated on a 9.5×9.3 mm die in a 1.2 μm n-well double metal, double poly, digital oriented CMOS technology. The organization of the system abstracts fr... View full abstract»

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  • Abacus: a 1024 processor 8 ns SIMD array

    Publication Year: 1995, Page(s):28 - 40
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    Describes the Abacus machine at a number of levels. Presents the microarchitecture of the PE comprising the reconfigurable bit-parallel array, a set of arithmetic and communication primitives, details of the VLSI implementation, and system-level design issues of a high-speed SIMD array. The most concrete goal of the Abacus project was to design and build a machine that could be used by members of ... View full abstract»

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  • Low latency self-timed flow-through FIFOs

    Publication Year: 1995, Page(s):76 - 90
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    Self-timed flow-through FIFOs are constructed easily using only a single C-element as control for each stage of the FIFO. Throughput can be very high in this type of FIFO as the communication required to send new data to the FIFO is local to only the first element of the FIFO. Circuit density can also be high because the control overhead is very small. However because data must travel through ever... View full abstract»

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  • Dynamic CMOS circuit techniques for delay and power reduction in parallel adders

    Publication Year: 1995, Page(s):121 - 130
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The successful design of high-speed parallel adders depend mainly on fast calculation of carry signals. A technique based on combining Manchester-Carry chains (MCC) with Clock-and-Data pre-charged dynamic logic blocks (CDPD) is suggested and analysed. This technique, as well as pure MCC and CDPD techniques, was incorporated into the design of carry calculation trees. Simulations indicate that 11-2... View full abstract»

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  • A multi-sender asynchronous extension to the AER protocol

    Publication Year: 1995, Page(s):158 - 169
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    The address-event representation (AER) is an asynchronous point-to-point communications protocol for silicon neural systems. This paper describes an extension of the AER protocol that allows multiple AER senders to share a common bus. A fully-functional silicon implementation of the extended protocol is described, as well as a functional board-level system of several of these chips sharing a commo... View full abstract»

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  • Optimization of combinational and sequential logic circuits for low power using precomputation

    Publication Year: 1995, Page(s):430 - 444
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Precomputation is a recently proposed logic optimization technique which selectively disables the inputs of a sequential logic circuit, thereby reducing switching activity and power dissipation, without changing logic functionality. In this paper, we present new precomputation architectures for both combinational and sequential logic and describe new precomputation-based logic synthesis methods th... View full abstract»

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  • On the performance of level-clocked circuits

    Publication Year: 1995, Page(s):342 - 356
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Although it is well-known that substituting level-sensitive latches for edge-triggered registers can boost circuit performance, results of measuring the performance gained by using latches in real circuits-when retiming is used to optimize the performance of both types of circuits-have been disappointing. In this paper we re-examine the speedup that can be expected from using latches and develop u... View full abstract»

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  • Efficient Galerkin techniques for multipole-accelerated capacitance extraction of 3-D structures with multiple dielectrics

    Publication Year: 1995, Page(s):200 - 211
    Cited by:  Papers (8)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    This paper describes an efficient implementation of a Galerkin based multipole-accelerated boundary element method for 3-D capacitance extraction of conductors in an arbitrary piecewise-constant dielectric medium. Results are presented to demonstrate that the Galerkin method is substantially more accurate than the commonly used collocation scheme for problems with dielectric interfaces. In additio... View full abstract»

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  • Combined DRAM and logic chip for massively parallel systems

    Publication Year: 1995, Page(s):4 - 16
    Cited by:  Papers (25)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    A new 5 V 0.8 μm CMOS technology merges 100 K custom circuits and 4.5 Mb DRAM onto a single die that supports both high density memory and significant computing logic. One of the first chips built with this technology implements a unique Processor-In-Memory (PIM) computer architecture termed EXECUBE and has 8 separate 25 MHz CPU macros and 16 separate 32 K×9 b DRAM macros on a single die.... View full abstract»

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  • OPTIMUS: a new program for OPTIMizing linear circuits with number-splitting and shift-and-add decompositions

    Publication Year: 1995, Page(s):258 - 271
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Most behavioral synthesis tools perform limited architectural transformations to optimize hardware and power. Previously, researchers have proposed decomposition of multiplications into shifts and adds to achieve average savings of 2.5 times in hardware. In this paper, we propose a new program called OPTIMUS and related algorithms, that combine an architectural transformation procedure called numb... View full abstract»

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  • Efficient retiming under a general delay model

    Publication Year: 1995, Page(s):368 - 382
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (716 KB)

    The polynomial-time retiming algorithms that were developed in the eighties assumed simple delay models that neglected several timing issues that arise in logic design. Recent retiming algorithms for more comprehensive delay models rely on non-linear formulations and run in worst-case exponential time using branch-and-bound techniques. In this paper, we investigate the retiming problem for edge-tr... View full abstract»

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  • Systematic objective-driven computer architecture optimization

    Publication Year: 1995, Page(s):286 - 300
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    Computer designers now have more transistors and architectural alternatives than at any time. Computer-aided design tools automate much of the physical design process. However, few tools have been developed to help the computer architect specify near-optimal microarchitectural configurations in the early design stages. Such tools are needed to systematically guide the early design specifications s... View full abstract»

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