AM6442: AM64x UDMA transmit timing

Hello GR,

GR said:

My customer check when DMA copy memory in step run and memory browser in CCS.

Result, It seem DMA copy is not do instantly after TR packet transmit.

Is there any dead time between TR packet transmit and do copy(DMA operation)?

When you call the below API, it does the TR initializations, which means what is the source address and destination address, how many bytes should be copied, and what is the trigger type. It will not start any DMA.

App_udmaTrpdInit

If you call the below API, the DMA operation will be started.

retVal = Udma_ringQueueRaw(Udma_chGetFqRingHandle(chHandle), trpdMemPhy);

GR said:

we could use both PKTDMA and BCDMA in same timing?

Yes, you can use both ; there is no issue .Here, what is the use case to better assist you.

Regards,

S.Anil.