Figure 2-9. Scxi-1163 Module Id Register Timing Diagram - National Instruments SCXI-1163 User Manual

Chapter 2
To read from the Module ID Register, follow these steps:
1. Initial conditions:
SS* asserted low.
SERDATIN = don't care.
DAQD*/A = 0.
= 1.
SERCLK = 1 (and has not changed since DAQD*/A went low).
2. For each bit to be read:
SERCLK = 0.
SERCLK = 1. This rising edge clocks the data.
Read the level of the SERDATOUT line.
3. Pull DAQD*/A high. This disables further reads from the Module ID Register. If you want,
you can write address FFFF (hexadecimal) to the Address Handler. This selects the Parking
Register and makes the module registers more immune to noise.
4. Pull low to deassert the SS* line and establish conditions for writing a new slot-select
number to the Slot 0 Slot-Select Register.
5. If you are not selecting another slot, write zero to the Slot 0 Slot-Select Register.
Figure 2-9 illustrates a read of the SCXI-1163 Module ID Register.
SLOT0SEL*
DAQD*/A
SS*
SERCLK
SERDATOUT
0

Figure 2-9. SCXI-1163 Module ID Register Timing Diagram

© National Instruments Corporation
0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
byte 0 = 18 byte 1 = 0
T DAQD*/A high to SERDATOUT high
delay
byte 2 = 0 byte 3 = 0
2-23
Configuration and Installation
T
delay
600 nsec
SCXI-1163 User Manual