User`s guide

20 • Registers Format
3.13 Extended I/O Ports
The PCI-9111 provides four extended input signals and four extended
output signals. The signals are on the 37 pin connector. The extended
output signals can be read back from the high nibble (4 MSBs) of the
extended input port. Note that the output EDO pins on CN3 (37 pin
connector) can be set as one of the following mode by software. The
definition of the setting value can be found in header file of the library
ACL_PCI.H.
1. EDO_INPUT EDO mode 1
2. EDO_OUT_EDO EDO mode 2
3. EDO_OUT_CHN EDO mode 3
The output EDO value can be put on the EDO pins only when the EDO is
set as mode 2. Under mode 1, the EDO output value will not be put on the
EDO pins, therefore the EDO signals are used as input only port. Under
mode 3, the EDO pins presents the high nibble (4 MSBs) of the AD
channel number no matter auto channel scan (ASCAN) bit is set or not.
Address: BASE + 4h
Attribute: write only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+4h X X X X EDO3 EDO2 EDO1 EDO0
BASE+5h X X X X X X X X
Address: BASE + 4h
Attribute: read only
Data Format:
Bit 7 6 5 4 3 2 1 0
BASE+4h EDO3 EDO2 EDO1 EDO0 EDI3 EDI2 EDI1 EDI0
BASE+5h X X X X X X X X
3.14 Digital I/O register
There are 16 digital input channels and 16 digital output channels are
provided by the PCI-9111. The address Base + 1C is used to access
digital inputs and control digital outputs.
Address: BASE + 2h
Attribute: read only
Data Format: