Burst Transactions

Versal ACAP Technical Reference Manual (AM011)

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

The AXI master interface data width and word size is 64 bits. The burst size can be programmed to 1, 4, 8, 16, or 256 words using DMA_Config [amba_burst_length] register bit.

The AXI DMA master always uses INCR type accesses. When performing data transfers, the burst length used can be programmed using bits [4:0] of the DMA configuration register. Either single or fixed length incrementing bursts up to a maximum of 256 are used as appropriate.

  • 1xxxx: Attempt to use bursts of up to 16
  • 01xxx: Attempt to use bursts of up to 8
  • 001xx: Attempt to use bursts of up to 4
  • 0001x: Use single word
  • 00001: Use single word
  • 00000: Attempt to use bursts of up to 256