Register Descriptions
Chapter 4
VXI-MXI User Manual
4-26
© National Instruments Corporation
INTX Interrupt Configuration Register (on VXI-MXIs with INTX only)
VXIbus Address:
Base A 12 (hex)
Attributes:
Read/Write
R/W
15
14
13
12
11
10
9
0
EINT7EN
EINT6EN
EINT5EN
EINT4EN
EINT3EN
EINT2EN
EINT1EN
8
R/W
7
6
5
4
3
2
1
0
EINT7DIR
EINT6DIR
EINT5DIR EINT4DIR
EINT3DIR EINT2DIR
EINT1DIR
0
This register on the INTX daughter card is used to configure the mapping of the seven VMEbus
interrupts lines to and from the seven INTX interrupt lines.
Bit
Mnemonic
Description
15,7r/w
0 Zero
Bits
These bits read back as zero to indicate that this register contains
the extended interrupt mapping bits. Writes to these bits have no
effect.
14-8r/w
EINT[7-1]EN
Extended Interrupt Enable Bits
Setting these bits individually enables the corresponding VMEbus
IRQ lines to drive or receive the corresponding INTX interrupt
line. The corresponding EINTDIR bits select whether the INTX
interrupt line is driven or received by the VMEbus IRQ line.
These bits are cleared on a hard reset.
6-0r/w
EINT[7-1]DIR
Extended Interrupt Direction Bits
When the corresponding EINTxEN bits are clear, these bits have
no meaning. When the corresponding EINTxEN bits are set, these
bits control the routing of the INTX IRQ signals. When
EINTxDIR is clear, the corresponding VMEbus IRQ line drives the
INTX IRQ line. If the EINTxDIR bit is set, the INTX IRQ line
drives the corresponding VMEbus IRQ line.
EINTxEN
EINTxDIR
Routing
0
X
Disabled
1
0
VME IRQ X drives INTX IRQ
1
INTX IRQ drives VME IRQ X