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

Cannot work

Firsr I built a project includes Nios II ,memories ,it works. When I added a DDR2 SDRAM controller, not only the DDR2 does't work but also the system . The pin assignment has been finished. Wh...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Does the nios2-download tells you that the processor can not be paused? --> check the reset signals for DDR2 controller (High Performance DDR2 Controller with Altmemphy has a reset_n signal as a top level port for the SOPC Builder System).

Does the nios2-download tells you Verify Failed? --> If you are downloading to DDR2 there may be problems with signal integrity. Try to build a memtest to run from internal memory.

I assume that by "download" you mean that you are trying to download a program. I would not give to much confidence to simulation when a designed based on Altemphy or uniphy are included in the project because these two *phy do not support post fitting simulation (found in the user guides).