Architecture and Evaluation of an Asynchronous Array of Simple Processors |
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Authors: | Zhiyi Yu Michael J Meeuwsen Ryan W Apperson Omar Sattari Michael A Lai Jeremy W Webb Eric W Work Tinoosh Mohsenin Bevan M Baas |
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Affiliation: | (1) ECE department, UC Davis, Davis, CA 95616, USA |
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Abstract: | This paper presents the architecture of an asynchronous array of simple processors (AsAP), and evaluates its key architectural
features as well as its performance and energy efficiency. The AsAP processor calculates DSP applications with high energy-efficiency,
is capable of high-performance, is easily scalable, and is well-suited to future fabrication technologies. It is composed
of a two-dimensional array of simple single-issue programmable processors interconnected by a reconfigurable mesh network.
Processors are designed to capture the kernels of many DSP algorithms with very little additional overhead. Each processor
contains its own tunable and haltable clock oscillator, and processors operate completely asynchronously with respect to each
other in a globally asynchronous locally synchronous (GALS) fashion. A 6×6 AsAP array has been designed and fabricated in
a 0.18 μm CMOS technology. Each processor occupies 0.66 mm2, is fully functional at a clock rate of 520–540 MHz at 1.8 V, and dissipates an average of 35 mW per processor at 520 MHz
under typical conditions while executing applications such as a JPEG encoder core and a complete IEEE 802.11a/g wireless LAN
baseband transmitter. Most processors operate at over 600 MHz at 2.0 V. Processors dissipate 2.4 mW at 116 MHz and 0.9 V.
A single AsAP processor occupies 4% or less area than a single processing element in other multi-processor chips. Compared
to several RISC processors (single issue MIPS and ARM), AsAP achieves performance 27–275 times greater, energy efficiency
96–215 times greater, while using far less area. Compared to the TI C62x high-end DSP processor, AsAP achieves performance
0.8–9.6 times greater, energy efficiency 10–75 times greater, with an area 7–19 times smaller. Compared to ASIC implementations,
AsAP achieves performance within a factor of 2–5, energy efficiency within a factor of 3–50, with area within a factor of
2.5–3. These data are for varying numbers of AsAP processors per benchmark.
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Keywords: | array processor chip multi-processor digital signal processing DSP globally asynchronous locally synchronous GALS many-core multi-core programmable DSP |
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