Product specifications

Design Guide - VT82C694X Apollo Pro133 with VT82C686A
Preliminary Revision 0.5, November 19, 1999 Signal Connectivity and Design Checklist
86
Technologies, Inc.
We ConnectWe Connect
SERIAL PORTS AND INFRARED INTERFACE
Signal Name I/O Connection
TXD1 O Connected to a corresponding 9-pin serial connector (usually COM1) through a serial
RS232 interface buffer and a 330pF decoupling capacitor to ground.
RXD1 I Same as the above.
RTS1# O Same as the above.
CTS1# I Same as the above.
DTR1# O Same as the above.
DSR1# I Same as the above.
DCD1# I Same as the above.
RI1# I Same as the above.
TXD2 O Connected to a corresponding 9-pin serial connector (usually COM2) through a serial
RS232 interface buffer and a 330pF decoupling capacitor to ground.
RXD2 I Same as the above.
RTS2# O Same as the above.
CTS2# I Same as the above.
DTR2# O Same as the above.
DSR2# I Same as the above.
DCD2# I Same as the above.
RI2# I Same as the above.
IRTX/GPO14 O Connect to an Infrared connector. 4.7K ohm pull-up to VCC.
IRRX/GPO15 IO Connect to an Infrared connector.
SERIAL IRQ
Signal Name I/O Connection
SERIRQ/
GPIOE/
OC1#
DRQ2
I
IO
I
I
4.7K ohm pull-up to VCC3.
INTERNAL KEYBOARD CONTROLLER
Signal Name I/O Connection
KBCK/A20GATE IO/I Connected to a keyboard connector through a 4.7K ohm pull-up to VCC, a 47pF capacitor
to ground, and a series ferrite bead.
KBDT/KBRC IO/I Same as the above.
MSCK/IRQ1 IO/I Connected to a mouse connector through a 4.7K ohm pull-up to VCC, a 47pF capacitor to
ground, and a series ferrite bead.
MSDT/IRQ12 IO/I Same as the above.