Descriptor Mode Programming

Versal ACAP Technical Reference Manual (AM011)

Document ID
AM011
Release Date
2022-04-26
Revision
1.4 English

Transfer parameters are specified in the buffer descriptors (BD). Software programs the SRC and DST BDs and enables a channel. The DMA channel uses the SRC and DST parameters for data transfer in a continuous fashion, as long as there are requests for data transfer in the source BDs and available destination buffers pointed by the destination BD. This can be viewed as memory-to-memory transfer. The channel fetches the first descriptor from the DSCR start address upon receiving an enable.