TMS320F28235 zone 0 memory location

btw: setup is calling InitXintf16Gpio() to setup address and data bus. in addition, zone 7 is use for program space and loading and running the program works fine.  zone 6 is connected to CPLD and that location looks fine too.

So, zones 6 & 7 work perfectly fine but you are having issues only with Zone 0?

robert bond said:

when I test the reading and writing of the data

Exactly how do you test reading and writing?

If you attempt to write to 0x4000 and read back, what do you get?

What does the Memory browser of CCS display for 0x4000?

Thanks... I write numbers starting at 0x4000 and get 0 for the first 256.. With memory bowser I can't write into the first 256, it stays  at 0.. Just weird to me.. 

Would you mind sharing your schematics with me privately? You can do this by initiating a friendship request. Just hover the cursor over my name.

We are now connected. is there a way we can web chat/share screen? if so, Zoom Meeting?  

I'll reach out to you directly.