Chapter 4
Register Descriptions
VME-MXI-2 User Manual
4-24
© National Instruments Corporation
VXIbus Subclass Register (VSCR)
VMEbus A16 Offset:
1E (hex)
Attributes:
Read Only
16, 8-bit accessible
15
14
13
12
11
10
9
8
SC[15]
SC[14]
SC[13]
SC[12]
SC[11]
SC[10]
SC[9]
SC[8]
7
6
5
4
3
2
1
0
SC[7]
SC[6]
SC[5]
SC[4]
SC[3]
SC[2]
SC[1]
SC[0]
The VXIbus Subclass Register (VSCR) is used to specify the precise class of a device
when it indicates with the DEVCLASS[1:0] bits in the VXIbus ID Register (VIDR) that
it is an Extended Class device. The VME-MXI-2 is a Mainframe Extender, which is one
of the VXIbus-defined Extended classes. This register contains the VXIbus Mainframe
Extender subclass code. This register conforms to the VXIbus Mainframe Extender
specification.
Bit
Mnemonic
Description
15-0
SC[15:0]
Subclass
These read-only bits return FFFC (hex).
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