Avalue EPI-LX800 - Manual (Page 19)

User’s Manual
EPI-LX800 Series User’s Manual 19
The Geode CS5536 companion device incorporates many I/O functions, including some
found in typical superI/O chips, simplifying many system designs. Since the graphics
subsystem is entirely contained in the Geode GX3 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
superI/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-6 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
battery-backed 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 PICs (programmable interrupt controllers), one PIT (programmable interval
timer) with three channels, and DMA (direct memory access) functions. The CS5536
companion device contains eight MFGPTs (multi-function general purpose timers) that can
be used for a variety of functions. A number of GPIOs (general purpose input/outputs) are
provided, and are assigned to system functions on power-up (i.e., LPC port).
State-of-the-art power management features are attained with the division of the device into
two internal power domains. The GPIOs 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.
For implementation details and suggestions for this device, see the supporting
documentation (i.e., application notes, schematics, etc.) on the AMD Alchemy™ and
Geode™ Developer Support web site.