PSTRB signal indicates which byte lanes to update during a write transfer.
it shows that the bus contain valid data, when PSTRB[3:0]=1111.
why we need bus instead of single bit PSTRB signal?
Hello sir, can you please guide me on how to calculate unaligned address for APB. For AXI we are using AWSIZE. So for APB which size should we use to calculate unaligned address?
The APB protocol doesn't support unaligned addresses. The APB tries to be as simple as possible, so complex access types are pointless complication.
So if you want to access an APB register, use a correctly aligned transfer (the alignment being defined by the width of the data bus implementation).