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Chapter 4 Register Descriptions
© National Instruments Corporation 4-45 VXI-MXI User Manual
Interrupt Status/Control Register
VXIbus Address: Base Address + 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
76
54321
IRQ7 IRQ6 IRQ5 IRQ4 IRQ3 IRQ2 IRQ1
0
0
DIRQ7 DIRQ6 DIRQ5 DIRQ4
DIRQ3
DIRQ2 DIRQ1
W
ACFAILIN
T
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