Issue 4 • Date Dec. 1995
Field-programmable gate arrays (FPGAs) are becoming an increasingly important implementation medium for digital logic. One of the most important keys to using FPGAs effectively is a complete, automated software system for mapping onto the FPGA architecture. Unfortunately, many of the tools necessary require different techniques than traditional circuit implementation options, and these techniques are often developed specifically for only a single FPGA architecture. In this paper we describe automatic mapping tools for Triptych, an FPGA architecture with improved logic density and performance over commercial FPGAs. These tools include a simulated-annealing placement algorithm that handles the routability issues of fine-grained FPGAs, and an architecture-adaptive routing algorithm that can easily be retargeted to other FPGAs. We also describe extensions to these algorithms for mapping asynchronous circuits to Montage, the first FPGA architecture to completely support asynchronous and synchronous interface applications. View full abstract»
Performance evaluation is critical for the minimization of design cost. It consists of two parts: modeling the underlying hardware engine and evaluating the performance of the application code for the model developed in the first part. In this paper, we propose a new parameterized model for application-specific architectures and present a retargetable scheduler for performance evaluation. The model, different from those proposed previously, reflects comprehensive architectural characteristics that affect hardware parallelism. The scheduler, distinguished from previous ones, takes into account not only functional and storage unit resources but also interconnect resources during the performance evaluation. The new architecture model, together with the retargetable scheduler, enables designers to accurately evaluate the performance of a variety of ASIC and ASIP architectures. View full abstract»
Field-programmable gate arrays (FPGAs) are an important implementation medium for digital logic. Unfortunately, they currently suffer from poor silicon area utilization due to routing constraints. In this paper we present Triptych, an FPGA architecture designed to achieve improved logic density with competitive performance. This is done by allowing a per-mapping tradeoff between logic and routing resources, and with a routing scheme designed to match the structure of typical circuits. We show that, using manual placement, this architecture yields a logic density improvement of up to a factor of 3.5 over commercial FPGAs, with comparable performance. We also describe Montage, the first FPGA architecture to fully support asynchronous and synchronous interface circuits. View full abstract»
This brief presents a novel high-performance architecture for implementation of custom digital feed forward neural networks, without on-line learning capabilities. The proposed methodology covers the entire design flow of a neural application, by addressing the internal neuron's structure, the system level organization of the processing elements, the mapping of the abstract neural topology (obtained through simulation) onto the given digital system and eventually the actual synthesis. Experimental results as well as a brief description of the software environment supporting the proposed methodology are also included. View full abstract»
Aims & Scope
Design and realization of microelectronic systems using VLSI/ULSI technologies require close collaboration among scientists and engineers in the fields of systems architecture, logic and circuit design, chips and wafer fabrication, packaging, testing, and systems applications. Generation of specifications, design, and verification must be performed at all abstraction levels, including the system, register-transfer, logic, circuit, transistor, and process levels.
To address this critical area through a common forum, the IEEE Transactions on VLSI Systems was founded. The editorial board, consisting of international experts, invites original papers which emphasize the novel system integration aspects of microelectronic systems, including interactions among system design and partitioning, logic and memory design, digital and analog circuit design, layout synthesis, CAD tools, chips and wafer fabrication, testing and packaging, and system level qualification. Thus, the coverage of this Transactions focuses on VLSI/ULSI microelectronic system integration.
Topics of special interest include, but are not strictly limited to, the following: • System Specification, Design and Partitioning, • System-level Test, • Reliable VLSI/ULSI Systems, • High Performance Computing and Communication Systems, • Wafer Scale Integration and Multichip Modules (MCMs), • High-Speed Interconnects in Microelectronic Systems, • VLSI/ULSI Neural Networks and Their Applications, • Adaptive Computing Systems with FPGA components, • Mixed Analog/Digital Systems, • Cost, Performance Tradeoffs of VLSI/ULSI Systems, • Adaptive Computing Using Reconfigurable Components (FPGAs)
Meet Our Editors
American University of Cairo and Zewail City of Science and Technology
New Cairo, Egypt