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For further information, please refer to the data book of the AMD Geode
3.2 Companion
AMD Geode™ CS5536 companion device
The AMD Geode™ CS5536 companion device is designed to work with an integrated processor North
Bridge component such as the AMD Geode™ GX/LX processor. Together, the Geode GX/LX processor
and Geode CS5536 companion device provide a system-level solution well suited for the high-
performance and low-power needs of a host of embedded devices including digital set-top boxes,
mobile computing devices, thin client applications, and single board computers.
The internal architecture uses a single, high-performance modular structure based on GeodeLink™
architecture. This architecture yields high internal speed (over 4 GB/s) data movement and
extremely versatile internal power management. The GeodeLink™ architecture is transparent to
application software. Communication with the Geode GX/LX processor is over a 33/66 MHz PCI bus.
The Geode CS5536 companion device incorporates many I/O functions, including some found in
typical Super-I/O chips, simplifying many system designs. Since the graphics subsystem is entirely
contained in the Geode GX/LX processor, system interconnect is simplified. The device contains
state-of-the-art power management that enables systems, especially battery powered systems, to
significantly reduce power consumption.
Audio is supported by an internal controller, designed to connect to multiple AC97 compatible
codecs. An IR (infrared) port supports all popular IR communication protocols. The IR port is shared
with one of two industry-standard serial ports that can reach speeds of 115.2 kbps. An LPC (low pin
count) port is provided to facilitate connections to a Super-I/O should additional expansion, such as
a floppy drive, be necessary, and/or to an LPC ROM for the system BIOS
The hard disk controller is compatible to the ATA-5 specification. The bus mastering IDE controller
includes support for two ATA-compliant devices on one channel. The CS5536 companion device
provides four Universal Serial Bus (USB) 2.0 compliant ports, supporting low speed, full speed, and
high speed connections. All four ports are individually automatically associated with either the Open
Host Controller Interface (OHCI) or the Enhanced Host Controller Interface (EHCI) depending on the
attached device type. A real-time clock (RTC) keeps track of time and provides calendar functions.
A suite of 82xx devices provides the legacy PC functionality required by most designs, including two
PIC's (programmable interrupt controllers), one PIT (programmable interval timer) with three
channels, and DMA (direct memory access) functions. The CS5536 companion device contains eight
MFGPT's (multi-function general purpose timers) that can be used for a variety of functions. A
number of GPIO's (general purpose input/outputs) are provided, and are assigned to system
functions on power-up.
State-of-the-art power management features are attained with the division of the device into two
internal power domains. The GPIO's and multi-function timers are distributed into each domain
allowing them to act as wakeup sources for the device. The device provides full ACPI (Advanced
Configuration Power Interface) compliance and supports industry-standard Wakeup and Sleep
modes.
TME-104-CLR-LX800-R1V3.doc
GeodeLink PCI Bridge
Security Block
Rev. 1.3
TM
LX 800
13(53)
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