68300

Hi All, 
I have some problems with my first 332 project. 

1. I am having an intermittent problem connecting to the 332 using the SDS debugger (BDM-wiggler cable) on a prototype derived from a working 68332 based target board; same clock, same memory configuration.

After working with the debugger for a few days, my prototype board started having problems with the connection. SDS began giving connection errors ( cannot FREEZE ) on some of the connection attempts and loading incorrect memory values into RAM on others. 

I started looking at the pins and found a waveform on the reset pin when the BDM is not connected. The signal is low and then starts to rise, it reaches up to 0 .4Vdd and then is pulled low again. Looks like a spiked waveform with the signal low for approximately 160ms. This continues until I try to connect to the 332 using BDM port. ( probably random code is being executed until an illegal instruction or memory access occurs forcing the CPU to reset. ) Once in a while the spikes stop to toggle from low to high and then I can connect. If the waveform continues the debugger fails to connect. 

2. I get read verify error at some memory locations. My RAM is configured to start at base address of 0x800000. 

Kindly advise. 
Shyam Mali 




____________________________________________________________
Get advanced SPAM filtering on Webmail or POP Mail ... Get Lycos Mail!
http://login.mail.lycos.com/r/referral?aid=27005