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Chapter 4
Register Descriptions
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:
Word Size:
Bit Map:
15
14
X
X
7
6
CHS3
CHS2
Bit
15–9
8–4
3–0
SCXI-1121 User Manual
Write-only
16-bit
13
12
X
X
5
4
CHS1
CHS0
Name
Description
X
Don't care bits.
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.
SL<3..0>
Slot Bit 3 through 0—These bits determine which slot in
the selected chassis is selected.
11
10
X
X
3
2
SL3
SL2
4-6
9
8
X
CHS4
1
0
SL1
SL0
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