Panasonic JS-170FR Series, Service Manual

Page: 32 / 161

2-2
Description of Main PCB Circuits
2.1.1 CPU PENTIUM-II 266MHz or 333MHz (Refer to the page 4-1.)
The CPU is operated at an operating clock signal frequency of 66MHz with the use of a mobile PENTIUM-II the core voltage of
which is +1.6V.
Details of CPU operation are obtainable from the relevant catalog.
2.1.2 Chip set FW82443BX, FW82371EB (Refer to the page 4-1 and page 4-3.)
As a control chip set for CPU’s peripheral circuits, two units in a pair of FW82443BX and FW82371EB are used.
The FW82443BX is directly combined with the CPU, and it is mainly in charge of memory control and PCI bus control.
In order to realize the AT compatibility, the FW82371EB is internally equipped with the basic LSI and the control circuit that
functions as a bridge circuit between the PCI bus and the ISA bus.
When the power supply is ON, the FW82443BX is used to execute initializing setting for the hardware with the aid of the memory
address bus (MAB 6#
~
12#).
For other details, refer to the relevant catalogs.
FUNCTION
MAB6# Buffer Mode
1 : Mobile
0 : Desktop
MAB7# MM Config
1 : Tri-stste
0 : Normal
MAB9# AGP
1 : Disable
0 : Enable
MAB10# Quick Start
1 : Quick
Start
0 : Stop Clock
MAB11#
Queue
Depth 1 : 4
0 : 1
MAB12# CLOCK
1 : 100MHz
0 : 66MHz