ADLINK PCI-7396 - Manual (Page 31)

Operation Theorem
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4
Operation Theorem
The operation theorem of the functions on PCI-7396 card is described in
this chapter. The operation theorem can help you to understand how to
manipulate or to program the PCI-7396.
4.1 Digital I/O Ports
4.1.1 Introduction
The PCI-7396 has 2/4 PPIs on board. Each 24-bit PPI is divided into three
8-bit I/O ports: A, B, and C. All of these 6/12 ports can be programmed as
input or output independent.
4.1.2 External Trigger
The pin-99 EXTTRG support user to receive an external trigger to latch
input data. User can use function _7396_Set_Event_Edge to set EXTTRG
pin to be active high or active low.
Figure 4.1 External Trigger Function Block
Edge
Control
Regist
EXTTR
INPUT DATA to PC
Read Data