Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!MATHOM.GANDALF.CS.CMU.EDU!lindsay
From: lindsay@MATHOM.GANDALF.CS.CMU.EDU (Donald Lindsay)
Newsgroups: comp.arch
Subject: Re: 64-bit addresses
Summary: physical not virtual
Message-ID: <7971@pt.cs.cmu.edu>
Date: 14 Feb 90 02:41:35 GMT
References: <9708@spool.cs.wisc.edu> <8840009@hpfcso.HP.COM>
Organization: Carnegie-Mellon University, CS/RI
Lines: 10

In article <8840009@hpfcso.HP.COM> dgr@hpfcso.HP.COM (Dave Roberts) writes:
>All those signals coming out of a chip will take
>a lot of chip area around the edge of a die, hence driving physical die
>sizes up (and chip yields down).

The "small" system of the future would map a 48-bit or 64-bit virtual
address to a 32-bit physical address. With an on-chip MMU, the pin
count would be the same as it is now.
-- 
Don		D.C.Lindsay 	Carnegie Mellon Computer Science