Product specifications

Design Guide - VT82C694X Apollo Pro133 with VT82C686A
Preliminary Revision 0.5, November 19, 1999 Signal Connectivity and Design Checklist
88
Technologies, Inc.
We ConnectWe Connect
GENERAL PURPOSE I/O
Signal Name I/O Connection
GPIOA(GPIO8) IO 4.7K ohm pull-up to VCC3 if no multiplexed function is applied.
GPIOB(GPIO9)/FAN2 IO Same as the above.
GPIOC(GPIO10)/
CHAS
IO Same as the above.
GPIOD(GPIO11) IO Same as the above.
GPIOE/
OC1/
SERIRQ/
DRQ2
IO
I
I
I
Same as the above.
GPIOF/
OC0/
DACK2#
IO
I
I
Same as the above.
HARDWARE MONITORING
Signal Name I/O Connection
VSENS1
I Connected to a monitored voltage (usually VCC2) through a voltage divider circuitry.
VSENS2
I Connected to a monitored voltage (usually 2.5V) through a voltage divider circuitry.
VSENS3
I Connected to a monitored voltage (usually VCC) through a voltage divider circuitry.
VSENS4
I Connected to a monitored voltage (usually +12V) through a voltage divider circuitry.
TMPSENS1
I Connect to a thermister that is near the sensed component or device.
TMPSENS2
I Same as the above.
VREF
P Connected to each thermister through a 10K ohm (1%) series resistor.
FAN1
I Connect to a fan tachometer output
FAN2/GPIOB(GPIO9) IO Same as the above.
CHAS/GPIOC(GPIO10) IO Connect to chassis intrusion circuitry.
XD INTERFACE
Signal Name I/O Connection
XDIR/PCS0#/GPO12 O Connect to the direction control of a 74F245 transceiver that buffers the X-Bus data and
ISA Bus data.
SOE#/MCCS#/GPO13 O Connect to the output enable control of two 74F245 transceivers that buffers the secondary
IDE data bus data and ISA address bus when the audio function is enabled.
CHIP SELECTS
Signal Name I/O Connection
PCS0#/GPO12/XDIR
O
Connect to addressed devices which drive data to the SD pins if XDIR and SOE# are
disabled and the X-Bus is not implemented.
MCCS#/GPO13/
SOE#
O
Connect to the chip enable control of a micro-controller chip if XDIR and SOE# are
disabled and the X-Bus is not implemented.
ROMCS#/KBCS#
O
Connect to the chip enable control of BIOS ROM. 4.7K ohm pull-down for Socket-7
configuration or 4.7K ohm pull-up to VCC3 for Slot-1 configuration.