New Contributor
New ContributorHello:
as shown in the graphic，f2h SDRAM connects to the scatter-Gather DMA,scatter-Gather DMA is mater and SDRAM is slave ,how i can access SDRAM through hps directly .what is the direction between DMA and HPS,can I access through hps directly,or how i can access DMA? SDRAM address is 0x00000000~0xffffffff
Frequent ContributorHello,
F2H SDRAM bridge is used to access DDR memory of HPS side by FPGA master (processor, DMA, or JTAG Master). You can read/write without any issues. the only thing that need to be considered is, the bridges should be enabled. To make this safely, let HPS configures the FPGA, and boots linux; on this case, you will guarantee the bridge enablement.
If you want to access DDR from HPS side, this can be done easily by using memtool in linux, you can read and write the DDR.
For DMA, you have to initialize the DMA to do the job for you. usually we use Nios II to configure the DMA, and then the DMA will transfer the data from FPGA side, to SDRAM HPS side. I am attaching an example of how to do that.
Thanks
