Irq Acknowledge Registers - National Instruments VXI-MXI User Manual

Chapter 4

IRQ Acknowledge Registers

VXIbus Address:
Attributes:
15 14
I15
I14
7 6
I7 I6
These registers generate a VMEbus interrupt acknowledge cycle when they are read from a
MXIbus device.
Bit Mnemonic
15-0r I[15-0]
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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*
Read Only
13 12
I13 I12
5 4
I5 I4
Description
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.
11 10
I11 I10
3 2
I3 I2
4-51
Register Descriptions
9 8
R
I9
I8
1
0
R
I1
I0
VXI-MXI User Manual