National Instruments PCI-DIO-96 User Manual

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National Instruments PCI-DIO-96 User Manual Manual pdf 64 page image

Appendix B Register-Level Programming — Port C Status-Word Bit Definitions for Input (Ports A and B)© National Instruments Corporation B-23 PCI-DIO-96/PXI-6508/PCI-6503 User ManualMode 1—Strobed OutputNote For mode 1 examples, you must configure the don’t care bits appropriately in thecontrol word if you want to use the other ports in combination with the example.Figure B-7 shows the control word written to the Configuration Register to configure port Afor output in mode 1. You can use bits PC4 and PC5 of port C as extra input or output lines.Figure B-7. Control Word to Configure Port A for Mode 1 OutputFigure B-8 shows the control word written to the Configuration Register to configure port Bfor output in mode 1. Notice that port B does not have extra input or output lines left fromport C when ports A and B are both configured for handshaking.Figure B-8. Control Word to Configure Port B for Mode 1 OutputDuring a mode 1 data write transfer, you can obtain the status of the handshaking lines andinterrupt signals by reading port C. Notice that the bit definitions are different for a write anda read transfer.Port C bits PC4 and PC51 = Input0 = OutputD7 D6 D5 D4 D3 D2 D1 D01 0 1 0 1/0 X XXD7 D6 D5 D4 D3 D2 D1 D01 X X X X 1 X0