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PCI Express*, Networking and Connectivity, Memory Interfaces, DSP IP, and Video IP
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SGDMA Memory to Stream Problem

Honored Contributor II



I am using SGDMA in MM -> ST configuration. The main aim is to read a frame from DDR2 SDRAM and send it to display via streaming link. I am using cycloneiii_3c120_niosii_video example design. I am only configuring lcd_sgdma to do the job. I have written a custom frame of 800x480 in DDR2 SDRAM using Nios CPU. The problem I am facing is that once the SGDMA descriptor list is built and polling starts, the program enters in stall mode. I have verified that descriptors are building correctly by using Nios II debugger. I am also checking the descriptor status to verify that there is no error in them. But still I am unable to transfer the data. What am i doing wrong? your prompt reply will be appreciated... 




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