Article View: comp.arch
Article #20593Re: RISC as a "technology window"?
From: Bob Blau
Date: Thu, 30 Mar 1989 18:39
Date: Thu, 30 Mar 1989 18:39
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1542 bytes
In article <16181@gumby.mips.COM>, keith@mips.COM (Keith Garrett) writes:
: In article <6416@cbmvax.UUCP> jesup@cbmvax.UUCP (Randell Jesup) writes:
: >
: > The problem with this is that off-chip access is slower than on-chip,
: >due to signal load and pad static-protection capacitance.
:
: there are also serious speed-of-light considerations. ...
: ... this effect will become worse in
: the future as transistor speeds become faster ...
This may be true in the far future when everything is optically
interconnected (on and off chip.) Today, at very high speeds, on-chip
delays rise up to bite you too!
Cray can achieve very fast cycle times with low levels of integration
and clever packaging - putting everything on-chip is not a panacea.
Apply: Std. disclaimer
Remember - it is possible for a particle to go faster than the speed
of light, just not in a vacuum!
--
Bob Blau Amdahl Corporation 143 N. 2 E., Rexburg, Idaho 83440
UUCP:{ames,decwrl,sun,uunet}!amdahl!tetons!bb (208) 356-8915
INTERNET: bb@tetons.idaho.amdahl.com
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!pasteur!ames!oliveb!apple!amdahl!tetons!bb From: bb@tetons.UUCP (Bob Blau) Newsgroups: comp.arch Subject: Re: RISC as a "technology window"? Summary: TANSTAAFL Message-ID: <759@tetons.UUCP> Date: 30 Mar 89 18:39:26 GMT References: <1552@vicom.COM> <15690@cup.portal.com> <1562@vicom.COM> <16181@gumby.mips.COM> Organization: Amdahl Corp., Rexburg, ID Lines: 25