c6457 edma3 and fifo mode

EDMA3 FIFO mode should not be used unless a specific internal peripheral or co-processor supports this device-internal-only mode. If a peripheral or co-processor DMA endpoint supports this mode, it will be specified clearly in the device datasheet.

In your case, you should only use SAM=0 and DAM=0.

Regards,
RandyP

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I use as source CE5 (0xd0000000) from EMIFA. As destination I use the buffer in L2. I.e. it turns out SAM = 1, DAM = 0. But so doesn't work. In the buffer there are all zero. I read that in c6455 so it is impossible to do. But for c6455 about it it is written nothing. The error can too.

We have not been clear about this FIFO mode from the beginning. It has caused a lot of confusion, just as in your case, through no fault of our excellent customers like yourself. The fault is in our documentation, and it is unfortunate that it has not been clearly addressed. Usually, there is one place is one document where it is mentioned directly, but I could not find it.

The answer is, for your case do not use FIFO mode.

Regards,
RandyP

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