AXI Memory Mapped Descriptor for H2C and C2H (32B) - 1.0 English

Versal ACAP DMA and Bridge Subsystem for PCI Express Product Guide (PG344)

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Table 1. AXI Memory Mapped Descriptor Structure for H2C and C2H
Bit Bit Width Field Name Description
[255:192] 64 reserved Reserved
[191:128] 64 dst_addr Destination Address
[127:92] 36 reserved Reserved
[91:64] 28 lengthInByte Read length in byte
[63:0] 64 src_addr Source Address

Internal mode memory mapped DMA must configure the descriptor queue to be 32B and follow the above descritor format. In bypass mode, the descriptor format is defined by the user logic, which must drive the H2C or C2H MM bypass input port.