Chapter 4
Register Descriptions
© National Instruments Corporation
4-5
VME-MXI-2 User Manual
VXIbus Device Type Register (VDTR)
VMEbus A16 Offset:
2 (hex)
Attributes:
Read Only
16, 8-bit accessible
15
14
13
12
11
10
9
8
REQMEM[3]
REQMEM[2]
REQMEM[1]
REQMEM[0]
MODEL[11]
MODEL[10]
MODEL[9]
MODEL[8]
7
6
5
4
3
2
1
0
MODEL[7]
MODEL[6]
MODEL[5]
MODEL[4]
MODEL[3]
MODEL[2]
MODEL[1]
MODEL[0]
This register contains information about the VME-MXI-2 that indicates the amount of
required address space and identifies the model code of the VME-MXI-2. This register
conforms to the VXIbus specification. Hard and soft resets have no effect on this register.
Bit
Mnemonic
Description
15-12
REQMEM[3:0]
Required Memory
These bits determine the amount of memory
space that will be requested by the VME-MXI-2
in either A24 or A32 address space as
determined by the Address Space bits
(ADSPC[1:0]) in the VXIbus ID Register
(VIDR). The amount of space requested will be
256
ADSPC[1:0]
* 2
(23 - REQMEM[3:0])
bytes. Refer
to Chapter 6, VXIplug&play for the VME-MXI-2,
or Appendix B, Programmable Configurations,
for information on configuring the required
memory of the VME-MXI-2.
11-0
MODEL[11:0]
Model Code
These bits return FE9 hex. National Instruments
has assigned this unique code to identify the
VME-MXI-2.
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