Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!decwrl!labrea!rutgers!bellcore!faline!thumper!rtm1
From: rtm1@thumper.bellcore.com (Ravi Masand)
Newsgroups: comp.sys.transputer
Subject: Transputer Clock
Message-ID: <1407@thumper.bellcore.com>
Date: 11 Dec 88 03:05:14 GMT
Organization: Bell Communications Research
Lines: 25


A question for the hardware hackers out there:

Do you have any information as to whether the transputer (T414, say) can
be slowed down by dropping its CLKIN frequency from the rated 5 MHz ??

The data sheet does not specify any limits on this frequency - just a
nominal value of 5 MHz - No Min, No Max!

I suspect that there is a limit to how slow one can go as the internal PLL
will be unable to lock below a minimum CLKIN. 

Which brings up another question - can the internal PLL be bypassed ? I know,
from looking at some old Inmos schematics, that this was possible with older
versions of the chips. Does the current version support this (as an
undocumented feature perhaps ) ??

And just what are those "HoldToGround" pins ??

Thank You.

Ravi Masand
thumper!rtm1
P.S. This is the second time I'm posting this - the first time, i suspect,
it turned to vaporware. If not, I Apologize.