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EMeti's avatar
EMeti
Icon for New Contributor rankNew Contributor
6 years ago

Questions regarding DCFIFO>DMA>DDR2 controller

1. In Qsys read from DCFIFO write to DDR2 SDRAM using DMA fails. In other words I want to write ADC samples into DDR2 SDRAM using DCFIFO+ DMA+DDR2_controller. 2. In Qsys I add another DMA to the exi...
NurAida_A_Intel's avatar
NurAida_A_Intel
Icon for Frequent Contributor rankFrequent Contributor
6 years ago

Dear EMeti,

I am truly sorry for the delay in response. I missed out your thread. I will try my best to help you. Please see my reply below, I need few clarification regarding the issue.

1. In Qsys read from DCFIFO write to DDR2 SDRAM using DMA fails. In other words I want to write ADC samples into DDR2 SDRAM using DCFIFO+ DMA+DDR2_controller.

[NAli1]: Can you try to read/write from DCFIFO + DMA + DCFIFO? Is it pass? The reason I ask because we want to know which side is causing the problem; is it from the DMA or the DDR2 controller.

2. In Qsys I add another DMA to the existing block I successfully write to and read from the same DDR2 onboard SDRAM by programming the DMA but; it is slow! 64 MB/sn.

[NAli1]: As I understand it, case #1 failed to perform read/write while case#2 can passed. What is the main configuration different between case #1 and #2 ?

Thanks

Regards,

NAli1