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CARD-PCI/GX Hardware Manual
1.1 System Overview
SCE8720Cxx (CARD-PCI/GX) is provided with almost all the functions usually equipped
on a mother board. These functions are accessed via the 280-pin main connector and 20-
pin connector.
As for 280-pin connector, manufacturer's genuine part is utilized. Functions accessed via
the 280-pin connector are PCI extended bus, CRT or TFT LCD panel display, 2-channel
USB, primary IDE, LIMITED ISA extended bus (*1), keyboard and mouse, 2-channel
serial/parallel port and AC97 interface. FDD and a part of interrupt of ISA are accessed
via the 20-pin connector.
SCE8720Cxx has Geode GX-LV 200MHz (CPU CHIP), Geode CS5530 (Companion chip),
97317 (Super IO) all built-in. As the main memory, SCE8720Cxx has a 32MB or 64MB of
synchronous D-RAM and has utilized the unified memory method, in which a part of the
synchronous D-RAM is used as the display memory. Generally, it is said that the unified
memory method results in low-performance. However, with SCE8720Cxx, high
performance is realized by compressing the data for display refreshing. In addition,
SCE8720Cxx has a built-in CPU core power regulator (VRM) and a built-in CLOCK
generator with built-in PLL.
SDRAM
32/64MB
Main
Memory&
V-RAM
Flash BIOS
256KB
Figure1.1 Block diagram of SCE8720Cxx
2
(*1: LIMITED ISA = ISA with limited capability)
Clocks
VRM
Geode GXLV
(CPU&North)
200MHz 2.2V
CS5530
(South&display)
PC97317(Super IO)
EPSON
PCI expansion
AC97
CRT
TFT
USB*2CH
IDE
LIMITED ISA expansion
KB/MOUSE
Serial*2CH
Parallel
FDD
Rev.A
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