Article View: comp.arch
Article #21028Re: Do you have bandwidth?
From: Randell Jesup
Date: Wed, 03 May 1989 19:36
Date: Wed, 03 May 1989 19:36
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1138 bytes
In article <833@wucs1.wustl.edu> jps@wucs1.UUCP (James Sterbenz) writes:
>This is a problem with packages that have pins only on the perimeter
>(such as DIPs), but not for PGAs. Of course, pin limitation is still
>a problem, but not quite as bad for PGAs.
But then again PGA's have thermal expansion coefficient problems due
to mismatch with the coefficient of board they mount on (or so I was told).
That's why the RPM-40 in in a leadless chip carrier instead of a PGA. (Perhaps
PGA's with sufficient pins weren't rated for 40 MHz, either.)
--
Randell Jesup, Commodore Engineering {uunet|rutgers|allegra}!cbmvax!jesup
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!lll-lcc!pyramid!cbmvax!jesup From: jesup@cbmvax.UUCP (Randell Jesup) Newsgroups: comp.arch Subject: Re: Do you have bandwidth? Keywords: memory bandwidth latency Message-ID: <6759@cbmvax.UUCP> Date: 3 May 89 19:36:55 GMT References: <407@bnr-fos.UUCP> <7766@thorin.cs.unc.edu> <23649@agate.BERKELEY.EDU> <833@wucs1.wustl.edu> Reply-To: jesup@cbmvax.UUCP (Randell Jesup) Organization: Commodore Technology, West Chester, PA Lines: 12