Chapter 4
Register Descriptions
© National Instruments Corporation
4-35
VME-MXI-2 User Manual
VMEbus Interrupt Control Register (VICTR)
VMEbus A16 Offset:
2A (hex)
Attributes:
Write Only
16, 8-bit accessible
15
14
13
12
11
10
9
8
LINT[3]
LINT[2]
LINT[1]
0
BKOFFIE
0
SFIE
AFIE
7
6
5
4
3
2
1
0
0
DIRQ[7]
DIRQ[6]
DIRQ[5]
DIRQ[4]
DIRQ[3]
DIRQ[2]
DIRQ[1]
This register allows the VME-MXI-2 to assert the VMEbus IRQ[7:1] lines and provides
enable bits for the various VME-MXI-2 local interrupts.
Bit
Mnemonic
Description
15-13
LINT[3:1]
Local Interrupt Level
These bits determine which VMEbus interrupt
level the local interrupt conditions will assert.
The local interrupt conditions are the BKOFF,
SFINT, and AFINT bits of the VMEbus Interrupt
Status Register (VISTR). Each condition can be
individually enabled in this register. Write a
number in the range 1 through 7 to these bits to
select the desired interrupt level. Writing a 0 to
these bits globally disables the local interrupt.
These bits are cleared by a hard reset and are not
affected by a soft reset.
12
0
Reserved
This bit is reserved. Write a 0 when writing to
this bit.
11
BKOFFIE
Back Off Interrupt Enable
Writing a 1 to this bit enables the BKOFF
interrupt condition in the VMEbus Interrupt
Status Register (VISTR) to assert the VMEbus
IRQ[7:1] selected by LINT[3:1]. This bit is
cleared by a hard reset and is not affected by a
soft reset.
10
0
Reserved
This bit is reserved. Write a 0 when writing to
this bit.
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