RE: Hardware problems with DS80C400

Anders,

I didn't encounter this problem when I brought up my custom board but I
did run into a problem where I was using an older version of JavaKit. It
didn't complain about the -400 or -flash 40 parameters but it wouldn't
program the flash correctly.

I ran into a similar problem on my parallel expansion because I
connected a device to the data bus that pulled the lines high. The C400
and C390 are very sensitive to bus loading so you might verify that you
haven't exceeded the drive capability of the CE lines or have something
pulling them up or down.

Just some thoughts and good luck!

CraigO.



-----Original Message-----
From: tini-admin-6tN4nzCoH/hBDgjK7y7TUQ@xxxxxxxxxxxxxxxx 
[mailto:tini-admin@xxxxxxxxxxx] On Behalf
Of Anders Nielsen
Sent: Thursday, June 26, 2003 4:15 AM
To: tini-6tN4nzCoH/hBDgjK7y7TUQ@xxxxxxxxxxxxxxxx
Subject: [TINI] Hardware problems with DS80C400


We are currently building our own Tini hardware based upon the reference
design from Dallas. We have established communication with the board and
have the received greetings from the autoloader 1.0.1. However we are
having problems with downloading the firmware. We have narrowed the
problem down to inactive CE pins. When trying a command like F 00 or D 0
100 there is no activity on the CE0 pin. There are however activity on
the WR, address and data pins as expected. 
Have anybody experienced similar problems? We would prefer not to change
the MCU if possible.... The MUX pin is hardwired to VCC..

Any comment would be appreciated

Anders Nielsen

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