Slot-select register – National Instruments SCXI-1121 User Manual
Page 88
Chapter 4
Register Descriptions
4-6
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Slot-Select Register
The Slot-Select Register contains 16 bits that determine which module in which chassis will
be enabled for communication when the SLOT0SEL* line is set to one. An SCXI-1000
chassis will select the appropriate module in its chassis, regardless of the chassis number
written. The Slot-Select Register will shift in the data present on the MOSI line, bit 16 first,
when SLOT0SEL* is cleared to zero.
Type:
Write-only
Word Size:
16-bit
Bit Map:
Bit
Name
Description
15-9
X
Don’t care bits.
8-4
CHS<4..0>
Chassis Bit 4 through 0—These bits determine which
chassis is selected. On the SCXI-1000 chassis, these bits
are don’t cares.
3-0
SL<3..0>
Slot Bit 3 through 0—These bits determine which slot in
the selected chassis is selected.
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