03-13-2011 01:42 PM
Hi,I am using HARD IP PCI express on CYCLONE IV. I am trying to configure Read and Write descriptor table for DMA Read and DMA Write between PCI device (FPGA) and PC. I am able successfully configure and do DMA Read from PC to Device (FPGA). As soon as I am configuring Write Descriptor table and giving start DMA command , PC gets crash.Any suggestions where could be the problem? Thanks
03-28-2011 04:57 PM
Hi,Provide physical memory address to DMA Controller. Also check the number of bytes allocated for DMA Transfer. Allocate the physical memory four times the size you are passing in write descripter table.