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Altera_Forum
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15 years ago

SGDMA: never ending transfer loop without refreshing the descriptors?

Hello, I'm using a SGDMA to transfer Data from DDR2-RAM to TSE with Gigabit Ethernet. Is it possible, to use SGDMA to continuous transfer Data from DDR2-RAM to TSE without refreshing the d...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

You can set the PARK bit of the SGDMA control register to 1:

"Seting this bit to 0 causes the SG-DMA controller core to clear

the OWNED_BY_HW bit in the descriptor after each descriptor is

processed. If the PARK bit is set to 1, the core does not clear the

OWNED_BY_HW bit, thus allowing the same descriptor to be

processed repeatedly without software intervention. You also

need to set the last descriptor in the list to point to the first one."

Best Regards,

Milos