Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Access to external RAM

I have a system that appears to work at a system clock of 70 MHz but fails to work at 85 MHz. @85MHz, when we run the firmware it behaves in a very strange manner. Often it will get to a specific poi...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

--- Quote Start ---

I have a system that appears to work at a system clock of 70 MHz but fails to work at 85 MHz. @85MHz

--- Quote End ---

I have a Nios system running @ 80MHz from PLL.

I am interfacing to an external asynchronous SRAM with a nominal 10ns access time.

I have to use 1 setup cycle and 1 wait cycle to make it work.

How is the timing set in your SOPC module?