Hi Forum,
I cannot understand when address is being wrapped in WRAP burst.In my example, the WRAP condition never happens in other words, during BURST operation address always remains small than wrap address.
From the spec, the wrapping happens when
Address_N = Wrap_Boundary + (Number_Bytes × Burst_Length),
And every new transfer for WRAP is defined as:
Address_N = Aligned_Address + (N – 1) × Number_Bytes
Now if we discuss this example:
Start_Address : 0x04 (d4):
awlen = 3 -> Burst_Length = 4
awsize = 1-> Number_Bytes=2
than we have:
Wrap Boundary = INT( d4/(2*4) ) * (2*4) = INT(0.5) * 8 = 1 *8 = 8
And Wrap Address: Address_N=Wrap_Boundary + (Number_Bytes × Burst_Length) = 8+(2*4) = 16
For the BURST:
Add1=4+ (1-1)*2 = 4
Add2=4+ (2-1)*2 = 6
Add3=4+ (3-1)*2 = 8
Add4=4+ (4-1)*2 = 10 --> our Burst_length is 4, so BURST is ended no need to WRAP the address, so wrap conditions not happened.
Can someone please help me understand what I missed here? And what is the new address value after WRAP?
Thanks
Hayk