Chapter 4
Register Descriptions
VME-MXI-2 User Manual
4-52
© National Instruments Corporation
DMA Interrupt Status/ID Register (DMAISIDR)
VMEbus A24 or A32 Offset:
20 (hex)
Attributes:
Read/Write
16, 8-bit accessible
15
14
13
12
11
10
9
8
0
0
0
0
0
0
0
0
7
6
5
4
3
2
1
0
DMASID[7]
DMASID[6]
DMASID[5]
DMASID[4]
DMASID[3]
0
1
1
This register provides the Status/ID information during IACK cycles for the DMA
interrupt. If SID8 and SIDLA are both set in the DMA Interrupt Configuration Register
(DMAICR), only the VME-MXI-2 module’s logical address is provided and this register
is not used. If SID8 is clear in the DMAICR (16-bit Status/ID) this register provides the
upper 8 bits of the Status/ID and the VME-MXI-2 module’s logical address is placed on
the lower 8 bits.
Bit
Mnemonic
Description
15-8
0
Reserved
These bits are reserved. Write each of these bits
with 0 when writing the DMAISIDR. The value
these bits return when read is meaningless.
7-3
DMASID[7:3]
DMA Status/ID 7 through 3
These bits can be written with any value to
uniquely identify the DMA interrupt during an
IACK cycle. When SID8 is clear in the
DMAICR (16-bit Status/ID), these bits provide
bits 15 through 11 of the Status/ID. When SID8
is set (8-bit Status/ID) and SIDLA is clear in the
DMAICR, these bits provide bits 7 through 3 of
the Status/ID. These bits are cleared on a hard
reset and are not affected by a soft reset.
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