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Register Descriptions Chapter 4
VXI-MXI User Manual 4-2 © National Instruments Corporation
Table 4-1. VXI-MXI Register Map
Register Name Offset from Base Type Size
Address (Hex)
VXIbus ID Register 0 Read Only 16-bit
Device Type Register 2 Read Only 16-bit
VXIbus Status/Control Register 4 Read/Write 16-bit
MODID Register 8 Read/Write 16-bit
Logical Address Window Register A Read/Write 16-bit
A16 Window Map Register C Read/Write 16-bit
A24 Window Map Register E Read/Write 16-bit
A32 Window Map Register 10 Read/Write 16-bit
INTX Interrupt Configuration * 12 Read/Write 16-bit
INTX Trigger Configuration * 14 Read/Write 16-bit
INTX Utility Configuration * 18 Read/Write 16-bit
Subclass Register 1E Read Only 16-bit
MXIbus Status/Control Register 20 Read/Write 16-bit
MXIbus Lock Register 22 Read/Write 16-bit
MXIbus IRQ Configuration Register 24 Read/Write 16-bit
Drive Triggers/Read LA Register 26 Read/Write 16-bit
Trigger Mode Selection Register 28 Read/Write 16-bit
Interrupt Status/Control Register 2A Read/Write 16-bit
Status/ID Register 2C Read/Write 16-bit
MXIbus Trigger Configuration Register 2E Read/Write 16-bit
Trigger Sync. Acknowledge Register 34 Write Only 8-bit
Trigger Async. Acknowledge Register 36 Write Only 8-bit
Interrupt Acknowledge for IRQ1 32 Read Only 16-bit
Interrupt Acknowledge for IRQ2 34 Read Only 16-bit
Interrupt Acknowledge for IRQ3 36 Read Only 16-bit
Interrupt Acknowledge for IRQ4 38 Read Only 16-bit
Interrupt Acknowledge for IRQ5 3A Read Only 16-bit
Interrupt Acknowledge for IRQ6 3C Read Only 16-bit
Interrupt Acknowledge for IRQ7 3E Read Only 16-bit
* The three INTX registers at offsets 12, 14, and 18 are only available on VXI-MXIs with the
INTX daughter card option. On VXI-MXIs without the INTX option, the entire range
between offsets 12 and 1C (inclusive) is VXI-MXI Reserved Space.