From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailserv2.iuinc.com (qmailr@mailserv2.iuinc.com [206.245.164.55]) by puffin.external.hp.com (8.8.7/8.8.7) with SMTP id MAA05682 for ; Wed, 20 Oct 1999 12:59:36 -0600 Received: from milano.cup.hp.com (root@milano.cup.hp.com [15.16.124.11]) by cosrel2.hp.com (8.9.3 (PHNE_18979)/8.8.5tis) with ESMTP id MAA09752 for ; Wed, 20 Oct 1999 12:58:08 -0600 (MDT) Message-Id: <199910201857.LAA28284@milano.cup.hp.com> To: Kirk Bresniker cc: parisc-linux@thepuffingroup.com Subject: Re: [parisc-linux] different PA2.0 CPUs in the same box? In-reply-to: Your message of "Tue, 19 Oct 1999 09:55:50 PDT." <199910191655.JAA08169@chrome.rose.hp.com> Date: Wed, 20 Oct 1999 11:57:08 -0700 From: Grant Grundler List-ID: Kirk Bresniker wrote: > Grant Grundler wrote: > | The processors can run from a "system clock" and they all run synchronous. > | No chance of "clock drift" since they run at exactly the same pace. > | But on systems like 870, T-class and N-class, the processors are fed clock > | signals from (similar but) different sources. Each frequency domain will > | slowly drift from the "average" and thus the processor clocks need to be > | resyncronized regularly. > | > > Eh? I can't speak to the T-Class, but N-Class processors (as well as > A,B,C,D,E,F,G,H,I,J,K, and L) all run from a single clock source. Kirk is right. T and V also run from a single clock source. So no problem. I was confusing the discussions with what actually got implemented. my apologies, grant Grant Grundler Communications Infrastructure Computer Operations +1.408.447.7253