System Overview
PEB-2530VL User’s Manual
1-5
1.3 System
Architecture
1.3.1 CPU/GX1
and
CS5530A
The NS Geode GX1 along with the CS5530A companion chip provide the basic
functionality and buses of the system:
Interface to SDRAM, 64-bit data bus. PC100 compliant SDRAM must be used.
PCI interface provided by GX1 CPU.
VGA controller with video memory shared with system memory (UMA). The
image data is transferred to the companion chip by means of
Pixel
bus.
CRT interface. Data provided by the
Pixel
and
Video
interface from the CPU.
Video interface from GX1 to the CS5530A. This data-stream is buffered and
multiplexed with the
Pixel
bus for windowed video viewing. This interface may
assist the processor in connection motion picture decoding.
USB integrated in the CS5530A.
IDE interface support Ultra DMA. Tow connectors are provided: A 44 pin pitch
2.0mm standard IDE interface on the primary and secondary controller and a
Compact Flash connector on the secondary controller.
1.3.2 XPRESS
Graphics
The XPRESS Graphics is based on the GX1 CPU and the CS5530A Companion chip
and this graphics controller is very cost efficient since almost no additional
components are required. This is achieved by using the SDRAM as frame-buffer and
by integrating the graphics engine and display interface in the GX1 CPU and the
CS5530A companion chip. This controller provides a CRT.
1.3.3
PCI Bus & PC/104 Plus interface
The PCI-bus on the board is provided by the GX1 CPU and will always run at
33MHz. A PC/104 Plus connector is equipped onboard for future expansion.
The GX1 CPU provides support for up to three bus masters. These bus master
signals are used by the CS5530A and the Intel 82559 Ethernet controller.
