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Altera_Forum
Honored Contributor
Honored ContributormSGDMA stride reads/writes
Has anyone used the Stride feature (available with the extended descriptor)? I using the Qsys PCIe example design on the wiki. When I enable the extended descriptor and stride option, the data tran...
Altera_ForumHonored Contributor
Honored ContributorStriding across PCIe doesn't sound like a good idea to me. For starters when stride is enabled you have to disable bursting which will kill your PCIe performance. Also related to that is that for each word transfer a new PCIe packet will need to be formed because stride will cause addresses to *not* be continous. Perhaps your impression of the feature is different than what is implemented. For example if you setup a stride of 16 for a DMA that is 64-bits wide these are the addresses you should see accessed assuming a start location of 0x0:
0x000-0x008 0x080-0x088 0x100-0x108 etc....
