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

Dear NAli1_Intel,

Many Thanks for reply,

  1. for the case #1 I will try DCFIFO + DMA + DCFIFO config. then will be back.
  2. in case #2 the main difference from case #1 is: the successfull (but slow) DMA operation reads data from DDR2 SDRAM to the HOST PC memory. I check it by writing to DDR2 SDRAM via PCIe_bar_1_0 and then reading the memory content via DMA. As I said it is successfull but; slower (64 MB/s read speed) than expected 500 MB/s.