National Instruments SCXI-1120 - page 69

Register Descriptions Chapter 4
SCXI-1120 User Manual 4-6 © National Instruments Corporation
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 high. 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 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
765432 10
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 – These bits 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 – These bits determine which
slot in the selected chassis is selected.