achaleus
Member level 5
Dear EDA Board members,
let us take one example with Burst Length=8, Number of Bytes=4 and Starting address=0x4a and data needs to be transferred using Wrapping Burst.
I have calculated the address of each transfer with respect to equations given in AMBA AXI Protocol Version 2.0 Specification.
the calculations are as follows,
The whole transaction looks like this
Here for 7th and 8th transfer the address is changed to 0x40 and 0x44 respectively, which gives me the data that is not needed by me.(Garbage values)
So can any one please tell me the necessary and importance of using the Wrapping Burst type transactions?
let us take one example with Burst Length=8, Number of Bytes=4 and Starting address=0x4a and data needs to be transferred using Wrapping Burst.
I have calculated the address of each transfer with respect to equations given in AMBA AXI Protocol Version 2.0 Specification.
the calculations are as follows,
Code:
Aligned Address = 0x48
Address_1=0x4a
Address_2=0x4c
Address_3=0x50
Address_4=0x54
Address_5=0x58
Address_6=0x5c
Address_7=0x60
Address_8=0x64
Wrap Boundary = 0x40
here Address_N = Wrap_Boundary + (Number_Bytes X Burst_Length)
= 0x40 + (4*8)
= 0x60
= Address_7
so Address_7 = Wrap Boundary =0x40.
then Address_8 will be 0x44.The whole transaction looks like this
Code:
0x4B 0x4A 0x49 0x48 --- 1st transfer
0x4F 0x4E 0x4D 0x4C --- 2nd transfer
0x53 0x52 0x51 0x50 --- 3rd transfer
0x57 0x56 0x55 0x54 --- 4th transfer
0x5B 0x5A 0x59 0x58 --- 5th transfer
0x5F 0x5E 0x5D 0x5C --- 6th transfer
0x43 0x42 0x41 0x40 --- 7th transfer
0x47 0x46 0x45 0x44 --- 8th transferHere for 7th and 8th transfer the address is changed to 0x40 and 0x44 respectively, which gives me the data that is not needed by me.(Garbage values)
So can any one please tell me the necessary and importance of using the Wrapping Burst type transactions?
