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Article #12105Re: HP PA-RISC Cache Question
From: Richard Crisp
Date: Sat, 15 Jun 1991 02:13
Date: Sat, 15 Jun 1991 02:13
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1666 bytes
In article <8840036@hpfcso.FC.HP.COM> maf@hpfcso.FC.HP.COM (Mark Forsyth) writes: >>From: lupin@jetsun.weitek.COM (Edward Lupin) >> >> >I don't think that anyone at HP is willing to describe any unpublished >technical details, especially in an area considered to be a competitive >advantage. Unfortunately in this respect, the RISC processor market is >still a competitive business. The only thing that can be said is that no >laws of physics are being violated, that there is plenty of timing margin >to insure reliability and manufacturability, and that the viability of >large primary caches (off-chip) for high-performance RISC was generally >written off prematurely by some of the industry (or at least according to >technical articles published in the last couple of years). > What Mark doesn't want to say is that HP figured out that they could calculate an address in half of a pipeline stage. They simply allow something like 1 and 1/2 pipe stages for a cache access. -- Richard Crisp crisp@mips.com MIPS Computer Systems !decwrl!mips!crisp 928 Arques MS 5-07 (408) 524-7250 Sunnyvale, Ca 94086
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!swrinde!mips!crisp From: crisp@mips.com (Richard Crisp) Newsgroups: comp.arch Subject: Re: HP PA-RISC Cache Question Message-ID: <4755@spim.mips.COM> Date: 15 Jun 91 02:13:08 GMT References: <1991Jun13.221247.6855@jetsun.weitek.COM> <8840036@hpfcso.FC.HP.COM> Sender: news@mips.COM Organization: MIPS Computer Systems, Sunnyvale, California Lines: 23 Nntp-Posting-Host: max_15.mips.com