When Ppc Devices Are Big-Endian; Figure 2-3. Big- To Little-Endian Data Swap - Motorola MTX Series Programmer's Reference Manual

When PPC Devices are Big-Endian

When all PPC devices are operating in big-endian mode, all data to/from
PCI must be swapped such that PCI looks big-endian from the PPC bus's
perspective. This is shown in the following figure.
D0
D7
D0

Figure 2-3. Big- to Little-Endian Data Swap

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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
2-15