--- Quote Start ---
In the user guide for the board, it states that the on-board SDRAM maximum frequency is approximately 125MHz.
--- Quote End ---
Please check that point again. I believe you are reading the SRAM description.
--- Quote Start ---
It is a Cyclone IVE board, with two IS42S16320B-7TL SDRAM modules connected in parallel so the effective data width is 32 bits.
Datasheet for the component states the maximum frequency is 143MHz.
--- Quote End ---
Well, at least you've got 10MHz more available should you choose to pursue it.
--- Quote Start ---
I see no progress with these.
--- Quote End ---
You're going to have to investigate further; theres a chance you still have an inefficient configuration of the SDRAM / Avalon-MM which might clear things up for you. And if push came to shove, I believe you can also get away with disabling SDRAM refreshes. But before pursuing that with any substantial effort, I would first confirm the problem using SignalTap to watch it happen and possibly decreasing the Clocked Video Output rate until you identify a working configuration, so you can get an idea of exactly how far away you are from your goal.
Honored Contributor
