Vxibus Configuration Registers; Vxibus Id Register - National Instruments VXI-MXI User Manual

Register Descriptions

VXIbus Configuration Registers

These registers are defined by the VXIbus specification for all VXIbus devices.

VXIbus ID Register

VXIbus Address:
Attributes:
15 14 13 12
0 1 1
1
ADDR
DEVCLASS
This register provides information about this device and its configuration. The bits in this
register are configured in hardware as shown above. Hard and soft resets have no effect on this
register.
Bit Mnemonic
15-14r DEVCLASS
13-12r ADDR
VXI-MXI User Manual
Base Address + 0 (hex)
Read Only
11 10 9 8
1 1 1 1
Description
Device Class Bits
These bits indicate the device class of the VXIbus device as
follows:
00 = Memory
01 = Extended
10 = Message-Based
11 = Register-Based
The VXI-MXI is an extended device defined by National
Instruments; therefore, these bits are configured in hardware as
binary 01.
Address Space Bits
These bits indicate the address spaces in which the VXIbus device
has operational registers as follows:
00 = A16/A24
01 = A16/A32
10 = Reserved
11 = A16 Only
The VXI-MXI has operational registers in A16 only; therefore,
these bits are configured in hardware as binary 11.
7 6 5 4
1 1 1 1
MANID
4-4 © National Instruments Corporation
Chapter 4
3 2 1 0
R
0 1 0
1