ROBO-503/ROBO-503N
ROBO-503/ROBO-503N User’s Manual
7
2.3.1 CPU/GX1 and CS5530A
The NS Geode GX1 along with the CS5530A companion chip provide the basic functionality
and buses of the system:
n
Interface to SDRAM, 64-bit data bus. PC100 compliant SDRAM must be used.
n
PCI interface provided by GX1 CPU.
n
PCI to ISA Bridge provided by CS5530A.
n
VGA controller with video memory shared with system memory (UMA). The image
data is transferred to the companion chip by means of
Pixel
bus.
n
CRT and TFT interface. Data provided by the
Pixel
and
Video
interface from the CPU.
The TFT interface and SA part of the ISA bus share pins as described later.
n
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.
n
USB integrated in the CS5530A.
n
IDE interface support Ultra DMA. Tow connectors are provided: A 44 pin pitch 2.0mm
standard IDE interface on the primary controller and a Compact Flash connector on the
secondary controller.
n
Digital audio interface to an AC97 compliant audio codec.
2.3.2 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 as well as a TFT interface which support the modes listed
below:
The TFT panel interface is available as a parallel interface in the CN3 connector.
2.3.3 PCI Bus
The PCI-bus on the board is provided by the GX1 CPU and will always run at 33MHz.
The GX1 CPU provides support for up to three bus masters. These bus master signals are
used by the CS5530A and dual Intel 82559ER Ethernet controllers.
