Cypress S6J3200 Series, Manual

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CHAPTER 31:Memory Protection Unit for AXI
S6J3200 Series Hardware Manual Document Number: 002-04852 Rev. *G 1139
Figure 3-1 MPU AXI Example Timings
MPU AXI uses burst start address (AWADDR, ARADDR signals), burst type (AWBURST, ARBURST
signals), burst length (AWLEN, ARLEN signals), and burst size (AWSIZE, ARSIZE signals) from AXI burst
transaction to calculate the lowest address and the highest address of the burst and then both the
addresses are used to find the region match.
For FIXED type of burst:
Lowest address = Highest address = Burst start address
For INCR type of burst:
Lowest address = Burst start address
Highest address = Burst start a (num_bytes x num_transfers) – 1
where, num_bytes is number of bytes in each transfer of burst and
num_transfers is number of transfers in the burst
For WRAP type of burst:
Lowest address = Wrap boundary
ACLK
WRAP INCR
ARBURST
ARVALID
AXI master
read address
ARREADY
channel
ADDR1 ADDR2
ARADDR
SIZE1 SIZE2
ARSIZE
LEN1 LEN2
ARLEN
Memory protection violation
WRAP FIXED
ARBURST
ARVALID
AXI memory read
address channel
ARREADY
ADDR1 ADDR_FIX
ARADDR
SIZE1 SIZE2
ARSIZE
LEN1 LEN2
ARLEN
NMI