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Altera_Forum's avatar
Altera_Forum
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16 years ago

How to Connect to SOPC Avalong Bus from outside of SOPC

I'm using the SDRAM with Nios and SOPC, but I also need to write to the SDRAM via logic that is outside the SOPC. How is this typically done? I'm assuming I would need to create a peripheral ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

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SDRAM has a high latency and many clock cycles are necessary before a word can be written or read.

You can reach Avalon speeds by using bursts, but AFAIK this is only supported by the DDR controller and not the SDR SDRAM.

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I did experiment using different memory (on chip ram, sram, sdram), but I couldn't see any difference.., the go strobe always needs to be a fraction of the avalon clock in order for it to work.