B-9 One-Byte Transfer To Pci I/O Space—Little-Endian Mode - Motorola MPC8240 User Manual

Little-Endian Mode
AD[3–0]
Figure B-9. One-Byte Transfer to PCI I/O Space—Little-Endian Mode
B-12
Processor
A[28–31]
Munge address
XOR with 111
PA[28–31]
0 0 1 0
0 1 2 3 4
xx xx D2 xx xx
CDU
Unmunges address
Swaps byte lanes
Runs PCI I/O transaction
During address phase
0 1 0 1
3 2 1
xx xx D2
D2
PCI I/O Space
MPC8240 Integrated Processor User's Manual
Core
0 1 0 1
Byte lanes
5 6 7
Internal peripheral logic data bus
xx xx xx
PCI byte lanes (C/BE1 asserted)
0
PCI data bus (AD[31–0] during data phase)
xx
0x00
0x08