Technical data
Register Descriptions
MVME4100 Single Board Computer Programmer’s Reference (6806800H19B)
36
3.1.8 PCI Bus Status Registers
The MVME4100 Status Registers provide PCI bus configuration information for each of the PCI
busses.
Table 3-9 PCI Bus 1 Status Register
REG PCI Bus 1 Status Register - 0xF200 0008
BIT76543 210
Field RSVD RSVD RSVD RSVD PCI_1_64B PCIX_1 PCI_1_SPD
OPERRRRRR RRR
RESET00001 X10
PCI_1_SPD PCI Bus 1 Speed. Indicates the frequency of PCI bus 1.
00: 33 MHz
01: 66 MHz
10: 100 MHz
11: 133 MHz
PCIX_1 PCI-X Bus 1. A set condition indicates that bus 1 is operating in PCI-X mode.
Cleared indicates PCI mode.
PCI_1_64B PCI Bus 1 64-bit. A set condition indicates that bus 1 is enabled to operate in 64-
bit mode. Cleared indicates 32-bit mode.
RSVD Reserved for future implementation.
Table 3-10 PCI Bus 2 Status Register
REG PCI Bus 2 Status Register - 0xF200 0009
BIT7 6 543 210
Field 3.3V_VIO 5.0V_VIO RSVD RSVD PCI_2_64B PCIX_2 PCI_2_SPD
OPERR R RRR RRR
RESET X X X 0 1 X X X