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Chapter 4
Register Descriptions
Slot 0 Register Descriptions
Slot 0 has three registers–the FIFO Register, the Hardscan Register, and the Slot-Select Register.
Only the Slot-Select Register is relevant to this module. The Slot-Select Register is a 16-bit
write-only register that determines with which slot the data acquisition board speaks when
SLOT0SEL* is released high. With the SCXI-1001 chassis, the Slot-Select Register also
determines in which chassis the desired slot is. Write to the Slot-Select Register using the
SLOT0SEL* line. Maintain software copies of the Slot-Select Register.
If you are using multiple chassis, it is important to understand the architecture of the Slot-Select
Register. Although each chassis has its own physical Slot-Select Register, all are written to at
the same time. The jumper settings in Slot 0 of a chassis determine with which chassis number
Slot 0 is identified. From the software perspective, only one Slot-Select Register exists in a
system composed of multiple chassis.
© National Instruments Corporation
4-7
SCXI-1163 User Manual
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