National Instruments 6508 PCI-DIO-96 - Manual (Page 57)

Chapter 6 Programming
© National Instruments Corporation 6-11 PCI-DIO-96 User Manual
Figure 6-2 shows the control word written to the Configuration Register
to configure port B for input in mode 1. Notice that port B does not have
extra input or output lines from port C.
Figure 6-2. Control Word to Configure Port B for Mode 1 Input
During a mode 1 data read transfer, read port C to obtain the status of
the handshaking lines and interrupt signals. See the Port C Status-Word
Bit Definitions for Input (Ports A and B), Port C Status-Word Bit
Definitions for Output (Ports A and B), and Port C Status-Word Bit
Definitions for Bidirectional Data Path (Port A Only) sections later in
this manual for detailed definitions.
D7 D6 D5 D4 D3 D2 D1 D0
1 X X X X 1 X 1