Slot-select register – National Instruments SCXI-1163 User Manual
Page 54
Register Descriptions
Chapter 4
SCXI-1163 User Manual
4-8
© National Instruments Corporation
Slot-Select Register
The Slot-Select Register contains 16 bits that determine which module in which chassis is
enabled for communication when the SLOT0SEL* line is high. An SCXI-1000 chassis selects
the appropriate module in its chassis, regardless of the chassis number written. The Slot-Select
Register shifts in the data present on the MOSI line, bit 15 first, when SLOT0SEL* is low.
Type:
Write-only
Word Size:
16-bit
Bit Map:
15
14
13
12
11
10
9
8
X
X
X
X
X
X
X
CHS4
7
6
5
4
3
2
1
0
CHS3
CHS2
CHS1
CHS0
SL3
SL2
SL1
SL0
Bit
Name
Description
15-9
X
Don't care bits – Unused.
8-4
CHS<4..0>
Chassis Bit 4 through 0 – Determine which chassis is
selected. On the SCXI-1000 chassis, these are don't care
bits.
3-0
SL<3..0>
Slot Bit 3 through 0 – Determine which slot in the selected
chassis is selected.