Registers
http://www.motorola.com/computer/literature 2-109
2
CONFIG_DATA RegisterThe description of the CONFIG_DATA register is also presented in three perspectives; from the PCI bus, from the PPC bus in Big Endian mode, and from the PPC bus in Little Endian mode. Note that the view from the PCI bus is purely conceptual, since there is no way to access the CONFIG_DATA register from the PCI bus. Conceptual perspective from the PCI bus:Perspective from the PPC bus in Big Endian mode:Perspective from the PPC bus in Little Endian mode:
Offset $CFF $CFE $CFD $CFC
Bit 3
13
02
92
82
72
62
52
42
32
22
12
01
91
81
71
61
51
41
31
21
11
09876543210
Name CONFIG_DATA
Data ‘D’ Data ‘C’ Data ‘B’ Data ‘A’
Operation R/W R/W R/W R/W
Reset n/a n/a n/a n/a
Offset $CFC $CFD $CFE $CFF
Bit (DL) 01234567891
01
11
21
31
41
51
61
71
81
92
02
12
22
32
42
52
62
72
82
93
03
1
Name CONFIG_DATA
Data ‘A’ Data ‘B’ Data ‘C’ Data ‘D’
Operation R/W R/W R/W R/W
Reset n/a n/a n/a n/a
Offset $CF8 $CF9 $CFA $CFB
Bit (DH) 01234567891
01
11
21
31
41
51
61
71
81
92
02
12
22
32
42
52
62
72
82
93
03
1
Name CONFIG_DATA
Data ‘D’ Data ‘C’ Data ‘B’ Data ‘A’
Operation R/W R/W R/W R/W
Reset n/a n/a n/a n/a