When Mpc Devices Are Little Endian; Figure 2-3. Big To Little Endian Data Swap - Motorola MVME2600 Series Reference Manual

.
D0
D7
D0

Figure 2-3. Big to Little Endian Data Swap

When MPC Devices are Little Endian

When all MPC devices are operating in little endian mode, the MPC
address must be modified to remove the exclusive-ORing applied by
MPC60x processors before being passed on to PCI. The three low order
processor bus address bits are exclusive-ORed with a three-bit value that
depends on the length of the operand, as shown in Table 2-4.
D1 D2 D3 D4
D6 D5 D4 D3
D1 D2 D3 D4
D7 D6 D5
D3 D2 D1
Functional Description
D5 D6 D7
PPC Bus
D2 D1 D0
64-bit PCI
D5 D6 D7 PPC Bus
D4 32-bit PCI
D0
1916 9610
2
2-17