Chapter 1 Board Description and Memory Maps
MVME3100 Programmer’s Guide (V3100A/PG1)
13
PCI Bus Status Registers
The PCI Bus Status registers provide PCI bus configuration information for each of the PCI buses.
PCI_A_SPD
PCI bus A speed. Indicates the frequency of PCI bus A.
00: 33 MHz
01: 66 MHz
10: 100 MHz
11: 133 MHz
PCIX_A
PCI-X bus A. A set condition indicates that bus A is operating in
PCI-X mode. A cleared condition indicates PCI mode.
PCI_A_64B
PCI bus A 64-bit. A set condition indicates that bus A is enabled to operate in 64-bit mode. A cleared
condition indicates 32-bit mode.
RSVD
Reserved for future implementation.
Table 1-10. PCI Bus A Status Register
REG
PCI Bus A Status Register - 0xE2000004
BIT
7
6
5
4
3
2
1
0
FIELD
RSVD
RSVD
RSVD
RSVD
PCI_A_
64
B
PCIX_A
PCI_A_
SPD
OPER
R
R
R
R
R
R
R
R
RESET
0
0
0
0
1
X
0
1