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Configuration and Installation Chapter 2
Lab-NB User Manual 2-12 © National Instruments Corporation
Table 2-2. Port C Signal Assignments
Programming
Mode
Group A Group B
PC7 PC6 PC5 PC4 PC3 PC2 PC1 PC0
Mode 0
I/O I/O I/O I/O I/O I/O I/O I/O
Mode 1 Input
I/O I/O IBF
A
STB
A
* INTR
A
STB
B
* IBFB
B
INTR
B
Mode 1 Output
OBF
A
* ACK
A
* I/O I/O INTR
A
ACK
B
* OBF
B
* INTR
B
Mode 2
OBF
A
* ACK
A
* IBF
A
STB
A
* INTR
A
I/O I/O I/O
* Indicates that the signal is active low.
Timing Specifications
The handshaking lines STB* and IBF are used to synchronize input transfers. The handshaking
lines OBF* and ACK* are used to synchronize output transfers.