A 6.2 GFLOPS Floating Point Multiply-Accumulator with Conditional Normalization
2006 (English)In: IEEE Journal of Solid-State Circuits, ISSN 0018-9200, Vol. 41, no 10, 2314-2323 p.Article in journal (Refereed) Published
A pipelined single-precision floating-point multiply-accumulator (FPMAC) featuring a single-cycle accumulate loop using base 32 and internal carry-save arithmetic with delayed addition is described. A combination of algorithmic, logic, and circuit techniques enables multiply-accumulate operations at speeds exceeding 3 GHz with single-cycle throughput. The optimizations allow removal of the costly normalization step from the critical accumulate loop. This logic is conditionally powered down using dynamic sleep transistors on long accumulate operations, saving active and leakage power. In addition, an improved leading-zero anticipator (LZA) and overflow prediction logic applicable to carry-save format is presented. In a 90-nm seven-metal dual-VT CMOS process, the 2 mm2 custom design contains 230K transistors. The fully functional first silicon achieves 6.2 GFlops of performance while dissipating 1.2 W at 3.1 GHz, 1.3-V supply
Place, publisher, year, edition, pages
2006. Vol. 41, no 10, 2314-2323 p.
CMOS logic circuits, adders, floating point arithmetic, multiplying circuits, 1.2 W, 1.3 V, 90 nm, CMOS digital integrated circuits, algorithmic technique, carry-save arithmetic, circuit technique, conditional normalization, delayed addition, floating-point multiply-accumulator, leading-zero anticipator, logic technique, overflow prediction logic
National CategoryEngineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-13110DOI: 10.1109/JSSC.2006.881557OAI: oai:DiVA.org:liu-13110DiVA: diva2:17854