User manual

Chapter 5 Register Descriptions
VXI-MXI-2 User Manual 5-4 © National Instruments Corporation
VXIbus ID Register (VIDR)
VXIbus Configuration Offset: 0 (hex)
Attributes: Read Only 32, 16, 8-bit accessible
15 14 13 12 11 10 9 8
DEVCLASS[1] DEVCLASS[0] ADSPC[1] ADSPC[0] MANID[11] MANID[10] MANID[9] MANID[8]
76 54 321 0
MANID[7] MANID[6] MANID[5] MANID[4] MANID[3] MANID[2] MANID[1] MANID[0]
This register contains information about the VXI-MXI-2. You can determine the device
class, the address spaces in which the VXI-MXI-2 has operational registers, and the
manufacturer ID of the VXI-MXI-2. This register conforms to the VXIbus specification.
When accessed with a 32-bit cycle, the bits of this register appear on bits 31 to 16 along
with the VXIbus Device Type Register (VDTR) on bits 15 to 0. Hard and soft resets have
no effect on this register.
Bit Mnemonic Description
15-14 DEVCLASS[1:0] Device Class
These bits return 01 (binary) to indicate that the
VXI-MXI-2 is an Extended Class device.
13-12 ADSPC[1:0] Address Space
These bits indicate the address spaces in which
the VXI-MXI-2 has operational registers. These
bits return 00 (binary) when the VXI-MXI-2 is
configured for A16/A24 space or 01 (binary)
when configured for A16/A32 space. Refer to
Chapter 7, VXIplug&play for the VXI-MXI-2, or
Appendix B, Programmable Configurations, for
information on configuring the address space of
the VXI-MXI-2.
11-0 MANID[11:0] Manufacturer ID
These bits return FF6 (hex) to indicate that the
manufacturer of the VXI-MXI-2 is National
Instruments.