82C836 Datasheet, PDF (19/205 Pages) List of Unclassifed Manufacturers – Single-Chip 386sx AT

s Signal Descriptions
Pin Assignments
Signal Descriptions
A signal name prefixed by a hyphen, such as -RAS0, specifies an active-low signal.
Tables 2-1 through 2-6 describes the functions and characteristics of the signals on
each pin or group of pins for the 82C836 chipset.
Table 2-1. Clock Input and Output Signals
Pin
Type
122
Input
121
Output
3
Input
2
Output
56
Output
Name
OSC1
OSC2
CXIN
PROCCLK
BUSCLK
Description
14.318MHz crystal oscillator input, either from an external
oscillator module or from a crystal that is also tied to OSC2.
The 82C836 circuit is an inverting amplifier and relies on low
crystal impedance at resonance (i.e. series resonance).
14.318MHz crystal oscillator output from the internal crystal
oscillator. If an external oscillator module is used, leave
OSC2 unconnected.
CPU clock oscillator input from an external oscillator. Serves
as the source for PROCCLK.
Processor Clock output to the 80386sx processor. The
frequency of PROCCLK is twice the processor’s internal
clock frequency.
Bus Clock output to the 8042 and AT bus.
2-2 Revision 3.0
PRELIMINARY
Chips and Technologies, Inc.