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Altera_Forum's avatar
Altera_Forum
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12 years ago

System ID and Time Stamp Not Found

I have developed a hardware design with Nios II processor. I am using a cpu, a sys clk timer, an interval timer, jtag uart, system id, sdram and pios. I am using the DE0 board. I have used both Quart...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Let me preface this by saying I'm no Qsys expert.

It looks like your processor is trying to run from the SDRAM. Was it previously running from the on-chip memory and can you run it from there while still including the SDRAM in your system? I would recommend using signaltap to see what the bus is doing, especially in regard to the SDRAM S1 signals. I'm guessing the SDRAM might be holding the bus via its wait request but can't be sure.

It also looks like you removed the system ID component but I think it's an indication of a bigger problem. If you add it back, you can try triggering on the system ID address when trying to access it through Eclipse. Whether it's the SDRAM or not, something is interfering with bus communications.