Chapter 4
Register Descriptions
© National Instruments Corporation
4-43
VME-MXI-2 User Manual
VMEbus Interrupt Acknowledge Register 6 (VIAR6)
VMEbus A16 Offset:
3C (hex)
Attributes:
Read Only
32, 16, 8-bit accessible
31
30
29
28
27
26
25
24
I6[31]
I6[30]
I6[29]
I6[28]
I6[27]
I6[26]
I6[25]
I6[24]
23
22
21
20
19
18
17
16
I6[23]
I6[22]
I6[21]
I6[20]
I6[19]
I6[18]
I6[17]
I6[16]
15
14
13
12
11
10
9
8
I6[15]
I6[14]
I6[13]
I6[12]
I6[11]
I6[10]
I6[9]
I6[8]
7
6
5
4
3
2
1
0
I6[7]
I6[6]
I6[5]
I6[4]
I6[3]
I6[2]
I6[1]
I6[0]
This register generates a VMEbus Interrupt Acknowledge (IACK) cycle for interrupt
level 6 when read from the MXIbus and returns the Status ID received from the
interrupter. It can generate 32-bit, 16-bit, or 8-bit IACK cycles. Generating an 8-bit
IACK cycle requires reading offset 3D (hex). When read from the VMEbus, this register
does not generate an IACK cycle and returns FFFFFFFF (hex).
Bit
Mnemonic
Description
31-0
I6[31:0]
Level 6 Interrupter Status ID
These bits return the Status ID received during
the IACK cycle.
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