ADLINK Technology PCI-7200 Especificaciones Pagina 33

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Operation Theorem 23
4
Operation Theorem
In PCI-7200, there are four data transfer modes can be used for digital
I/O access and control, these modes are:
1. Direct Program Control: the digital inputs and outputs can be
read/written and controlled by its corresponding I/O port address directly.
2. Internal Timer Pacer Mode: the digital input and output operations
are paced by internal timer pacer and transferred by bus mastering DMA.
3. External Clock Mode: the digital input operation is clocked by
external I_REQ strobe and transferred by bus mastering DMA.
4. Handshaking: through REQ and ACK signals, the digital I/O can have
simple handshaking data transfer.
4.1 Direct Program Control
The digital I/O operations can be controlled by I/O port BASE+10
for digital input and BASE+14 for digital output.
The I/O port address BASE is assigned by system BIOS, please
refer to Section 5 for more detailed description.
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