SoC Design and Simulation forum AMBA AHB Lite addressable space for byte size transfer

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AMBA AHB Lite addressable space for byte size transfer

DonVerilog over 6 years ago

Hi,

It looks like when using a transfer size of one Byte, the position of this data on the 32-Bit bus must be set via ADDRESS[1:0]. This means that for a Byte transfer, the addressable space is reduced, from 4GB (2^32) to 2^(30) = 1GB. Is this correct ?

Thanks

Top replies

Colin Campbell over 6 years ago in reply to DonVerilog +1

I think what you are now describing is correct. The AHB-lite protocol is a byte addressable protocol, so with HADDR at 32-bits this supports 4G of addressable bytes. If your target slave only has 32...