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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 Address + 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 65432
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
10
VME IRQ X drives INTX IRQ
1 INTX IRQ drives VME IRQ X