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Chapter 4 Register Descriptions
© National Instruments Corporation 4-7 VXI-MXI User Manual
VXIbus Status/Control Register
VXIbus Address: Base Address + 4 (hex)
Attributes: Read/Write
R
15 14 13 12 11 10 9
1 MODID* 1 ACCDIR
8
0
0
00 0000
W
R
7
654321
RDY PASS
1
RESET
0
00000
0
0 RESET
W
EDTYP
E
VERSIO
N
This register provides status information about this VXIbus device and provides a bit to force the
VXI-MXI into a Soft Reset state. The RESET bit is cleared on a hard reset. Hard and soft resets
have no effect on the other bits on this register.
Bit Mnemonic Description
15r/w, 1 Reserved Bits
14-10w,
9r/w, 8w, These bits are reserved and read back as ones. Write a zero when
7-2w, 1r/w writing to these bits.
14r MODID* MODID Line Status Bit
This bit is zero when the device is selected by the MODID line,
and one when the device is not selected by the MODID line. This
bit is read only.
13-10r EDTYPE Extended Device Type Class Bits
These bits are driven low by an optional daughter card installed on
the two 96-pin daughter card connectors. They identify the
daughter card and its capabilities. When a daughter card is not
installed, these bits are all ones. The INTX daughter card has been
assigned extended device type class hex E; therefore, when the
VXI-MXI includes this option, these bits are hex E. These bits are
read only.
8r ACCDIR Access Direction Bit
When this bit is one, the current access to the Status register
originated from a device on the MXIbus. When this bit is zero, the
current access to the Status register originated from a device on the
VMEbus. This bit is read only.