Chapter 4
Register Descriptions
© National Instruments Corporation
4-9
VXI-MXI User Manual
VXIbus Extender Registers
These registers are defined for VXIbus extender devices.
MODID Register
VXIbus Address:
Base A 8 (hex)
Attributes:
Read/Write
R/W
15
14
13
12
11
10
9
0
0
OUTEN
MODID12
MODID11
MODID10
MODID9
MODID8
8
R/W
7
6
5
4
3
2
1
MODID7
MODID6
MODID5
MODID4
MODID3
MODID2
MODID1
MODID0
0
This register provides control and status of the MODID lines when the VXI-MXI is installed in
Slot 0.
Bit
Mnemonic
Description
15-14r/w 0
Reserved
Bits
These bits are reserved and read back as zeros. Write a zero when
writing to these bits.
13r/w
OUTEN
MODID Output Enable Bits
When this bit is set, the VXI-MXI is enabled to drive the MODID
lines. When this bit is cleared, the MODID drivers are disabled.
This bit should only be set when the VXI-MXI is in Slot 0. This
bit is cleared on both hard and soft resets.
12-0r/w
MODID[12-0]
MODID Drive Bits
If the OUTEN bit is set, setting one of these bits drives the
corresponding MODID line high, and clearing the bit drives the
line low. Independent of OUTEN, reading these bits always
returns the current status of the corresponding MODID lines. Hard
and soft resets have no effect on these bits.