Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!decwrl!nsc!pyramid!cbmvax!jesup
From: jesup@cbmvax.UUCP (Randell Jesup)
Newsgroups: comp.arch
Subject: Re: Do you have bandwidth?
Keywords: memory bandwidth latency
Message-ID: <6775@cbmvax.UUCP>
Date: 4 May 89 19:52:20 GMT
References: <407@bnr-fos.UUCP> <7766@thorin.cs.unc.edu> <23649@agate.BERKELEY.EDU> <833@wucs1.wustl.edu> <6759@cbmvax.UUCP> <18753@obiwan.mips.COM>
Reply-To: jesup@cbmvax.UUCP (Randell Jesup)
Organization: Commodore Technology, West Chester, PA
Lines: 13

In article <18753@obiwan.mips.COM> mark@mips.COM (Mark G. Johnson) writes:
>Seems to me that PGA's do just fine with respect to both temperature
>and frequency.  The defacto industry-standard CMOS video DAC (Brooktree 458)
>comes in an 84 pin PGA, dissipates 2.2 Watts, and runs at 125 MHz.
>Maybe Brooktree is more clever with "rating" their package than RPM40 was.

	Maybe.  We needed 140 or so pins, most of them running at 40Mhz,
CMOS device, 2-3 watts.  Also, this was in '85 or '86, and we wanted to use
an out-of-the-box package (this wasn't a production part, so we didn't want 
to pay to develop/certify a package).

-- 
Randell Jesup, Commodore Engineering {uunet|rutgers|allegra}!cbmvax!jesup