Chapter 2 Configuration and Installation
© National Instruments Corporation 2-20 SCXI-1160 User Manual
Use the following procedure for selecting a slot in a particular chassis. Figure 2-8 illustrates the
timing of this procedure with the example of selecting Slot 11 in Chassis 9. Notice that the
factory-default chassis address for the SCXI-1000 is address 0. For information on changing the
address of your chassis, consult the SCXI-1000/1001 User Manual. An SCXI-1000 chassis will
respond to any chassis number.
0
1
0 0
1
1 0
1
1
Chassis ID = 9 Slot 11
SERDATIN
SS*X
Chassis Y
SS*11
Chassis 9
SERCLK
SLOT0SEL*
Tss_dis
Tss_en
Tclk_wait
Tslot0sel*_wait
Tss _ dis
SLOT0SEL* low to SS* disabled 200 nsec maximum
Tclk _ wait
SLOT0SEL* low to first rising edge on SERCLK 75 nsec minimum
Tslot0sel* _ wait
Last rising edge on SERCLK to SLOT0SEL* high 250 nsec minimum
Tss _ en
SLOT0SEL* high to SS* enabled 350 nsec maximum
Figure 2-8. Slot-Select Timing Diagram
To write the 16-bit slot-select number to Slot 0, follow these steps:
1. Initial conditions:
SERDATIN = don't care.
DAQD*/A = 1.
SLOT0SEL* = 1.
SERCLK = 1.
2. Clear SLOT0SEL* to 0. This will deassert all SS* lines to all modules in all chassis.
3. For each bit, starting with the MSB, perform the following action:
a. Set SERDATIN = bit to be sent. These bits are the data that are being written to the
Slot-Select Register.
b. SERCLK = 0.
c. SERCLK = 1. This rising edge clocks the data.