System Overview
PEB-7431VL User’s Manual
1-5
1.4 System
Architecture
1.4.1
CPU and Chipset STPC Atlas (System on Chip)
The STPC Atlas system on chip provide the basic functionality and buses of the
system:
Interface to SDRAM, 64-bit data bus.
PCI interface provided by STPC Atlas.
PCI to ISA Bridge provided by STPC Atlas.
VGA controller with video memory shared with system memory (UMA).
IDE interface support Ultra DMA. Tow connectors are provided: A 40 pin pitch
2.54mm standard IDE interface on the primary controller and a Compact Flash
connector on the secondary controller.
1.4.2
STPC Atlas Graphics
The Graphics is based on the STPC Atlas system on chip and this integrated 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 STPC Atlas system on chip. This
controller provides a CRT as well as a TFT interface.
1.4.3 PCI
Bus
The PCI-bus on the board is provided by the STPC Atlas and will always run at
33MHz.
The STPC Atlas provides support for up to two bus masters. These bus master
signals are used by the Realtek 8139C Ethernet controller.
1.4.4 SDRAM
Interface
This board uses SDRAM in the compact DIMM-168 form factor. 3.3V PC 100
SDRAM modules are recommended to use.
