How can I run program on external SRAM?

Altera_Forum · ‎08-09-2016

Dear,

In my system,there is a 2MByte external SRAM,I have implemented a SRAM interface controller using Qsys, and passed reading and writing test of SRAM from NIOS processor. I want to run the NIOS program in the external SRAM, how can I implement it? Thanks for your help.

Altera_Forum · ‎08-09-2016

Hello,

You can add an Sram component to your qsys configuration, connect it with the Nios II processor, compile it.

Then go to quartus, instantiate the verilog/VHDL object generated by qsys in quartus, connect the i/o and that should do it.

Altera has tuturials that cover the first step in the altera university forum.

Best Regards,

Johi

Altera_Forum · ‎08-09-2016

You need a section of on-chip memory as well. This is where you point your reset vector. You put a code copier in the on-chip ram that copies your code from flash to external memory. There are some tools to help with this. I've seen a tutorial video on doing this, but I don't remember where. It is also explained in the Nios II embedded software development documentation.

Altera_Forum · ‎08-24-2016

I have made SRAM access successfully. Tips below:

1.SRAM interface shall support byte access.

2.I make use of Avalon_mm interface directly,do not use tristate-bridge.

3.make sure the SRAM timing is correct,especially write timing