VXi 320222-01 User Manual
Chapter 4
Register Descriptions
© National Instruments Corporation
4-51
VXI-MXI User Manual
IRQ Acknowledge Registers
VXIbus Address:
Base Address + 32 (hex) for IRQ1*
Base Address + 34 (hex) for IRQ2*
Base Address + 36 (hex) for IRQ3*
Base Address + 38 (hex) for IRQ4*
Base Address + 3A (hex) for IRQ5*
Base Address + 3C (hex) for IRQ6*
Base Address + 3E (hex) for IRQ7*
Base Address + 34 (hex) for IRQ2*
Base Address + 36 (hex) for IRQ3*
Base Address + 38 (hex) for IRQ4*
Base Address + 3A (hex) for IRQ5*
Base Address + 3C (hex) for IRQ6*
Base Address + 3E (hex) for IRQ7*
Attributes:
Read Only
R
15
14
13
12
11
10
9
I15
I14
I13
I12
I11
I10
I9
I8
8
R
7
6
5
4
3
2
1
I7
I6
I5
I4
I3
I2
I1
I0
0
These registers generate a VMEbus interrupt acknowledge cycle when they are read from a
MXIbus device.
MXIbus device.
Bit
Mnemonic
Description
15-0r
I[15-0]
Interrupt Acknowledge Status/ID
Reading from these registers generates an interrupt acknowledge
cycle on the VMEbus and returns the Status/ID value from the
interrupt acknowledge cycle. These registers can be used to handle
interrupts across the MXIbus. Each VMEbus IRQ line has a
separate interrupt acknowledge register, as shown above in the
VXIbus Address. The value returned when these registers are read
by a VMEbus device is hex FFFF.
cycle on the VMEbus and returns the Status/ID value from the
interrupt acknowledge cycle. These registers can be used to handle
interrupts across the MXIbus. Each VMEbus IRQ line has a
separate interrupt acknowledge register, as shown above in the
VXIbus Address. The value returned when these registers are read
by a VMEbus device is hex FFFF.