ARM Technical Support Knowledge Articles

What is the maximum amount of data that PL330 can transfer at any one time on a single channel?

Applies to: PL330 AXI DMA Controller

Answer

The maximum transfer size is governed by the AXI burst limitation of 128 bytes width (1024 bits) 
x 16 beats. This equates to 2048 bytes. These contraints also happen to be the maximum values 
allowed when programming the CC_n registers in PL330, i.e. src/dst_burst_size = 128 bytes 
(3'b111, max), src/dst_burst_len = 16 data transfers (4'b1111, max).

Any burst transfer, regardless of source or destination width, is limited to a maximum of 16 
beats.

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