National Instruments SCXI-1121 - Manual (Page 84)

Chapter 4 Register Descriptions
SCXI-1121 User Manual 4-2 www.natinst.com
Module ID Register
The Module ID Register contains the 4-byte module ID code for the SCXI-1121. This code
number will be read as the first four bytes on the MISO line whenever the module is accessed.
The bytes will appear least significant byte first. Within each byte, data is sent out most
significant bit first. Additional data transfers will result in all zeros being sent on the MISO
line. The Module ID Register is reinitialized to its original value each time the SCXI-1121 is
deselected by the SS* signal on the backplane.
Type: Read-only
Word Size: 4-byte
Bit Map:
Byte 0
Byte 1
Byte 2
Byte 3
7 6 5 4 3 2 1 0
0 0 0 0 0 0 1 0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0
7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0