W83787IF Datasheet, PDF (120/123 Pages) Winbond – WINBOND I/O WITH SERIAL-INFRARED SUPPORT

W83787IF
Application Note 4
Aug 9, 1995
How to test IR function in 787IF?
It is very easy to test the IR Function within the 787IF. I suggest some methods to test it, you can follow below steps to do
it.
A. If you only have an old board with 787F, you can mount 787IF to this old board, i.e., 787IF is pin to pin compatible
with 787F. If you only have a new board with 787IF, you can directly mount 787IF on the board. Then you can check the
787IF all functions including FDC, PRT, COMA, COMB, and IDE function whether they can normal work or not. If it
can normal operation, the first phase has been finished.
B. If you an old board with 787F, then stick up the Pin2 (PDCIN) and Pin3 (PDBDIR) or another Pins which are IR
Receiver (IRRX) and IR Transceiver (IRTX) respectively. Then connected them using another wire and put together with
VDD (5V) and GND to a connector which shows as follows.
787IF
IRRX
IRTX
IRCON
.
IRRX
IRTX
5V
GND
IR
Module
C. Loopback test IR function:
1-1. First, you must configure the configuration registers of 787IF which you can use the program
supplied by Winbond such as W787I.EXE.
How to use the program W787I.EXE?
You should be in the DOS prompt and type W787I command then it show a config IR's draft. In the row
of URIRSEL, you select IR function. (Default is normal function, i.e., COMB)
1-2. Also you can use the DEBUG.EXE command in DOS prompt, then configure 787IF register as shown
follows:
- O 250 89
- O 251 0c
- I 252 20 // This configure COMB from normal function to IR function.
- O 250 00
787I APN 4
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