Geode™ CS5530A I/O Companion
Multi-Function South Bridge
General Description
The CS5530A I/O companion is designed to work in conjunction with a GX-series processor (i.e., GX1, GXLV,
GXm); all members of the National Semiconductor®
Geode™ family of products. Together, the Geode processor and CS5530A provide a system-level solution well
suited for the high performance needs of a host of devices
which include digital set-top boxes and thin client devices.
Due to the low power consumption of the GX-series processors, this solution satisfies the needs of battery powered devices such as National’s WebPAD™ system, and
thermal design is eased allowing for fanless system
design.
The CS5530A I/O companion is a PCI-to-ISA bridge (South
Bridge), ACPI-compliant chipset that provides AT/ISA style
functionality. The device contains state-of-the-art power
management that enables systems, especially battery
powered systems, to significantly reduce power consumption.
Audio is supported through PCI bus master engines which
connect to an AC97 compatible codec such as the National
Semiconductor LM4548. If industry standard audio is
required, a combination of hardware and software called
Virtual System Architecture® (VSA™) technology is provided.
The Geode GX-series processors’ graphics/video output is
connected to the CS5530A. The CS5530A graphics/video
support includes a PLL that generates the DOT clock for
the GX-series processors (where the graphics controller is
located), video acceleration hardware, gamma RAM plus
three DACs for RGB output to CRT, and digital RGB that
can be directly connected to TFT panels or NTSC/PAL
encoders. The digital RGB output can also be connected to
the National Semiconductor Geode CS9211 graphics companion (a flat panel display controller) for DSTN panel support.
Geode™ CS5530A Internal Block Diagram
PCI Bus
USB
PCI to USB Macro
PCI to X-Bus / X-Bus to PCI Bridge
PCI Configuration
Registers
Active Decode
Address Mapper
X-Bus Arbiter
GPIOs
GPCS
Pwr Mgmt, Traps,
Events, and Timers
X-Bus
Graphics
and Video
from CPU
Display
Audio/Codec/MPU
Interface
MPEG, DOT Clock
CSC and SCL
RGB/FP Interface
ISA Bus Interface
AT Ports, ISA Megacells
Geode™ CS9211
Graphics Companion
Joystick
AT Compatibility Logic
Display Interface
CS5530A Support
Ultra DMA/33
IDE
Interface
AC97 Codec
(e.g., LM4548)
Joystick / Game Port
ISA Bus
PC97317 SIO
IDE
National Semiconductor and Virtual System Architecture are registered trademarks of National Semiconductor Corporation.
Geode, VSA and WebPAD are trademarks of National Semiconductor Corporation.
For a complete listing of National Semiconductor trademarks, please visit www.national.com/trademarks.
© 2001 National Semiconductor Corporation
www.national.com
Geode™ CS5530A I/O Companion Multi-Function South Bridge
May 2001
Revision 1.1
