MVME3100 Programmer’s Guide (V3100A/PG1)
Chapter 1 Board Description and Memory Maps
14
PCI_B_SPD
PCI bus B speed. Indicates the frequency of PCI bus B.
00: 33 MHz
01: 66 MHz
10: 100 MHz
11: 133 MHz
PCIX_B
PCI-X bus B. A set condition indicates that bus B is operating in
PCI-X mode. A cleared condition indicates PCI mode.
PCI_B_64B
PCI bus B 64-bit. A set condition indicates that bus B is enabled to operate in 64-bit mode. A cleared
condition indicates 32-bit mode.
ERDY1
EREADY1. Indicates that the PrPMC module installed in PMC site 1 is ready for enumeration when
set. If cleared, the PrPMC module is not ready for enumeration. If no PrPMC is installed, this bit is
always set.
ERDY2
EREADY2. Indicates that the PrPMC module installed in PMC site 2 is ready for enumeration when
set. If cleared, the PrPMC module is not ready for enumeration. If no PrPMC is installed, the bit is
always set.
5.0V_VIO
5.0V VIO Enabled. This bit set indicates that the PMC bus (PCI bus B) is configured for 5.0V VIO.
3.3V_VIO
3.3V VIO enabled. This bit set indicates that the PMC bus (PCI bus B) is configured to 3.3V VIO.
Table 1-11. PCI Bus B Status Register
REG
PCI Bus B Status Register - 0xE2000005
BIT
7
6
5
4
3
2
1
0
FIELD
3.3V
_VIO
5.0V
_VIO
ERD
Y
2
ERD
Y
1
PCI_B_
64B
PCIX_B
PCI_B_
SPD
OPER
R
R
R
R
R
R
R
R
RESET
X
X
X
0
1
X
X
X