Figure 6-7. Control Word To Configure Port A As Mode 2 Bidirectional Data Bus - National Instruments 6508 PCI-DIO-96 User Manual

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D7 D6 D5
1 1 X

Figure 6-7. Control Word to Configure Port A as Mode 2 Bidirectional Data Bus

During a mode 2 data transfer, you can obtain the status of the
handshaking lines and interrupt signals by reading port C. The port C
status-word bit definitions for a mode 2 transfer are shown as follows.
D4 D3 D2
X X 1/0
6-17
Chapter 6 Programming
D1 D0
1/0 1/0
Port C
PC <2..0>
1 = Input
0 = Output
Port B
1 = Input
0 = Output
Group B Mode
0 = Mode 0
1 = Mode 1
PCI-DIO-96 User Manual