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EDMA

tie
Prodigy 130 points

hi, i want to known wether VPIF or VDCE uses EDMA? if not, what DMA does VPIF or VDCE use? QDMA?  where can i find any related resouces on this topic.

thanks.

tie

  • TI__Mastermind 41665 points

    The VPIF and VDCE use the same switched central resource (internal DMA bus) as the EDMA but they do not use the EDMA peripheral itself, they are able to initiate their own transfers. In other words using the VPIF or VDCE will not use up EDMA channels, though they do share the same bandwidth, particularly on the DDR2 interface.

  • TI__Mastermind 37340 points

    I believe VPIF has its own DMA hardware that is always turned on.  As Bernie suggested, it does not use EDMA channel resources (or QDMA).  However, if it needs to access a peripheral (e.g. DDR2 ) thru switch central resouce, then it contends with any other host peripheral (e.g. EDMA channel) also accessing that resource (e.g. DDR2).  I hope this helps clear things up.