User`s guide

Registers • 31
3.16 Extended I/O Ports
The PCI-9111 provides four extended input signals and four extended output
signals. The signals are available on the 37-pin connector. The extended
output signals can be read back from the 4 MSB of the extended input port.
Note that the output EDO pins on CN3 (37 pin connector) can be set to any one
of the following modes by software. The definition of the set value can be found
in the 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 only be send to the EDO pins if the EDO is set as
mode 2. Under mode 1, the EDO output value does not get sent to the EDO
pins; therefore the EDO signals are used as an input only port. Under mode 3,
the EDO pins holds the 4 MSB of the AD channel number even if 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