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Altera_Forum's avatar
Altera_Forum
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13 years ago

Best way to interface my CPU

Hello, I am wondering what is the best way to interface my 32-bit RISC CPU. I need to interface it with the sdram memory, the flash memory, and possibly the sram memory. I will also need to dedicate ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
13 years ago

I don't have the right hardware to run your project on. I did find a problem though. You have set up the onchip_memory for the exception vectors and the .text section, but this memory is read-only. This means that when you upload your software, you won't be able to change the exception vectors or to write the application to memory. This could cause the CPU to hang. Try to set it to RAM, or to use one of the other memories (but not the SRAM, as you didn't connect the instruction master to this one).

Did you configure the STDOUT channel to the Jtag Uart in the BSP settings? This should be automatic, but you never know.

The fact that the memory is 16 bits shouldn't be a problem, QSys can adapt to that. You can try and configure the BSP to put everything in the onchip memory (once you have set it up to RAM) and put a memory test software example there. From that you should be able to test your external memories.