r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 674

• Manufacturer Part Number: r8a77850anbg
• Description: Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
• Manufacturer: Renesas Electronics Corporation.

13. PCI Controller (PCIC)
(6)
This LSI supports both the big and little endian formats. Since the PCI local bus is inherently little
endian, the PCIC supports both byte swapping and non-byte swapping.
The endian format is specified by the TBS bit in PCICR.
Rev.1.00 Jan. 10, 2008 Page 644 of 1658
REJ09B0261-0100
Endian
Figure 13.13 Endian Conversion from PCI Bus to SuperHyway Bus
Note: PCIAddr[2]: PCI bus AD[2]
1. Little endian
PCI bus data
SHwy data
2. Big endian
PCI bus data
SHwy data
Buffer data
(Non-Byte Swapping: TBS = 0)
Buffer data
PCI_Addr[2] = 1
PCI_Addr[2] = 0
MSB
MSB
31
31
A B C
A' B' C' D' A B C D
A' B' C' D' A B C
A B C
A B C D A' B' C' D'
A B C D A' B' C' D'
D
D
0
0
PCI_Addr[2] = 0
PCI_Addr[2] = 1
D
LSB
LSB