ARM Technical Support Knowledge Articles

Can PL230 generate unaligned accesses?

Applies to: DMA-230 MicroDMA Controller

Answer

No - PL230 will not drive unaligned addresses on to the bus. It will always mask the lower bits for the size of the transfer (bit[0] for 16-bit transfers, bits[1:0] for 32-bit transfers) to ensure that the address is aligned. Any other behaviour would be contrary to the AHB-Lite protocol.

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