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Proceedings Paper

Use of delayed addition techniques to accelerate integer and floating-point calculations in configurable hardware
Author(s): Zhen Luo; Margaret Martonosi
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Paper Abstract

This paper proposes and evaluates an approach for improving the performance of arithmetic calculations via delayed addition. Our approach employs the idea used in Wallace trees to delay addition until the end of a repeated calculation such as accumulation or dot-product; this effectively removes carry propagation overhead from the calculation's critical path. We present imager and floating- point designs that use this technique. Our pipelined integer multiply-accumulate design is based on a fairly traditional multiplier design, but with delayed addition as well. This design achieves a 37 MHz clock rate on an XC4036XL-2 FPGA. Next, we present a 32-bit floating-point accumulator based on delayed addition. Here delayed addition requires a novel alignment technique that decouples the incoming operands from the accumulated result. A conservative version of this design achieves a 33 MHz clock rate. Finally, we also present a more aggressive 32-bit floating-point accumulator design that achieves a 66 MHz clock rate. These designs demonstrate the utility of delayed addition for accelerating FPGA calculations in both the integer and floating-point domains.

Paper Details

Date Published: 8 October 1998
PDF: 10 pages
Proc. SPIE 3526, Configurable Computing: Technology and Applications, (8 October 1998); doi: 10.1117/12.327033
Show Author Affiliations
Zhen Luo, Princeton Univ. (United States)
Margaret Martonosi, Princeton Univ. (United States)


Published in SPIE Proceedings Vol. 3526:
Configurable Computing: Technology and Applications
John Schewel, Editor(s)

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