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From: george@wombat.bungi.COM (George Scolaro)
Newsgroups: comp.sys.nsc.32k
Subject: Re: GNU cross development tools.
Message-ID: <9012122114.AA12163@wombat.bungi.COM>
Date: 13 Dec 90 04:14:19 GMT
Sender: news@daver.bungi.com
Lines: 28
Approved: news@daver.bungi.com

[In the message entitled "GNU cross development tools." on Dec 13,  6:36, Johannes Helander writes:]
> 
> I have one question regarding the pc532 board: Is the debug (/DBG) pin
> of the CPU connected _directly_ to the power layer or is it adequate
> to just cut the trace leading from it to be able to connect a debug
> switch? Nobody here seemed to have the layouts in printable form.
> 
> 	Johannes

The /DBG pin connects to a pullup resistor V+, unfortunately it is in the
chain of all V+ connections. Therefore cutting the trace that leads to it
on the solder side would cause the trace leading away from it (on an inner
layer) to still be connected to /DBG.

Looking from the top side of the board (component side), with the board
oriented such that the 532 is at the top, and the power connector is at the
bottom right:

			  |  <-- this trace is on an inner layer
			 /
			o  <-- the /DBG pin
		_______/  <-- this trace on the solder side

best regards,

-- 
George Scolaro
george@wombat.bungi.com                [37 20 51 N / 122 03 07 W]