Chapter 4
Register Descriptions
© National Instruments Corporation
4-45
VXI-MXI User Manual
Interrupt Status/Control Register
VXIbus Address:
Base A 2A (hex)
Attributes:
Read/Write
R
15
14
13
12
11
10
9
LINT3
LINT2
LINT1
BKOFF
TRIGINT
SYSFAIL
ACFAIL
8
LINT3
LINT2
LINT1
0
BKOFFIE TRIGINTIE SYSFAILIE ACFAILIE
W
R
7
6
5
4
3
2
1
IRQ7
IRQ6
IRQ5
IRQ4
IRQ3
IRQ2
IRQ1
0
0
DIRQ7
DIRQ6
DIRQ5
DIRQ4
DIRQ3
DIRQ2
DIRQ1
W
ACFAILINT
SYSFAILINT
This register is used to configure local interrupts, drive the VMEbus IRQ lines individually, and
reflect the status of the VMEbus IRQ lines. The upper byte (bits 15 through 8) of this register is
cleared on a hard reset. The lower byte (bits 7 through 0) is cleared on hard and soft resets.
Bit
Mnemonic
Description
15-13r/w LINT[3-1]
Local Interrupt Line Bits
These bits select the VMEbus interrupt request line onto which the
local VXI-MXI interrupts are routed. The local interrupts are
BKOFF, TRIGINT, ACFAIL, and SYSFAIL.
LINT3 LINT2 LINT1
VMEbus Interrupt Request Line
0
0
0
Local Interrupt Disabled
0
0
1
Interrupt Request Line 1
0
1
0
Interrupt Request Line 2
0
1
1
Interrupt Request Line 3
1
0
0
Interrupt Request Line 4
1
0
1
Interrupt Request Line 5
1
1
0
Interrupt Request Line 6
1
1
1
Interrupt Request Line 7
