Path: utzoo!mnetor!uunet!husc6!bloom-beacon!gatech!amdcad!tim From: tim@amdcad.AMD.COM (Tim Olson) Newsgroups: comp.arch Subject: Re: super multipliers Message-ID: <20218@amdcad.AMD.COM> Date: 3 Feb 88 23:27:02 GMT References: <235@unicom.UUCP> <28200089@ccvaxa> <3127@phri.UUCP> <230@m2.mfci.UUCP> Reply-To: tim@amdcad.UUCP (Tim Olson) Organization: Advanced Micro Devices Lines: 20 In article jk3k+@andrew.cmu.edu (Joseph G. Keane) writes: | I've heard of a `super multiplier', a big gate-array which multiplies without | any clocking. I assume this was only integer multiplies, though. Does anyone | know if this has been done for floating point? What are the fastest times | (ns) that have been done for various multiplies? The Am29325 from Advanced Micro Devices is a custom bipolar floating-point processor (single-precision) which is purely combinatorial (no clocking, except for the status register). It can add, subtract, multiply, or convert in 125ns. About 30% of the chip area is devoted to the multiplier array. The Am29027 is a new, double-precision CMOS floating-point processor, which can be pipelined or not. In flow-through mode, it can multiply two double-precision IEEE values in 250ns, or 125ns pipelined. It has a full 52 bit x 52 bit multiplier on chip (BIG!) -- Tim Olson Advanced Micro Devices (tim@amdcad.amd.com)