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Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 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
14 years ago

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You do not use it, fine. I am quite sure that with the altmemphy based DDR2 controller, a reset_n signal appears in the SOPC Builder. It may appear even with the uniphy based controller (never used it). Are you sure this reset is correctly connected? If left floating or grounded it may give a reset to the controller, I am not sure that the controller while in reset do not asks for a system reset.

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Does the reset_n signal you said affect downloading the program?

I know it affect simulation