Registers
http://www.motorola.com/computer/literature 2-97
2
PCI RegistersThe PCI Configuration Registers are compliant with the configuration
register set described in the PCI Local Bus Specification, Revision 2.1.
The CONFIG_ADDRESS and CONFIG_DATA registers described in
this section are accessed from the PPC bus within PCI I/O space.
All write operations to reserved registers will be treated as no-op s. That is,
the access will be completed normally on the bus and the data will be
discarded. Read accesses to reserved or unimplemented registers will be
completed normally and a data value of 0 will be returned.
The PCI Configuration Register map of the PHB is shown in Table 2-17.
The PCI I/O Register map of the PHB is shown in Table 2-18
Table 2-17. PCI Configuration Register
3
13
02
92
82
72
62
52
42
32
22
12
01
91
81
71
61
51
41
31
21
11
09876543210 <--- Bit
DEVID VENID $00
STATUS COMMAND $04
CLASS REVID $08
HEADER $0C
MIBAR $10
MMBAR $14
$18 - $7C
PSADD0 $80
PSOFF0 PSATT0 $84
PSADD1 $88
PSOFF1 PSATT1 $8C
PSADD2 $90
PSOFF2 PSATT2 $94
PSADD3 $98
PSOFF3 PSATT3 $9C