LPC47S45X datasheet(9/259 Pages) SMSC

9 / 259 page

SMSC LPC47S45x

Page 9 of 259

Rev. 06-01-06

DATASHEET

GENERAL DESCRIPTION

The LPC47S45x is a 3.3V PC2001 compliant Super I/O controller designed for server applications. The LPC47S45x

implements the LPC interface, a pin reduced ISA interface which provides the same or better performance as the

ISA/X-bus with a substantial savings in pins used. The part provides 55 GPIO pins, ACPI support, an X-Bus

interface, two SMBus controllers, a fan speed control output, a fan tachometer input and four ISA IRQs that can be

routed to any of the serial IRQs. The LPC47S45x also provides Power on Elapsed Time counters for Main Power and

Standby Power, power supply on/off control, and a Real Time Clock.

The X-Bus interface allows the LPC47S45x to interface to as many as four external components that have an eight

bit data bus and occupy up to 4 contiguous I/O address ports. It is accessible by either the SMBus or the LPC

interface. It is capable of interfacing to an LCD Panel Interface Controller without any external logic and it can be

used for Port 80h “snooping”.

The LPC47S45x offers two SMBus controllers that share the same pin interface. The SMBus slave only device

provides external access to an LCD controller that can be attached to the X-Bus. It is capable of disabling the floppy

port, the serial ports, and the parallel port. The SMBus slave only device can also tristate the Serial Port 2 interface

so that it may be muxed with an external UART controller. The LPC47S45x is equipped with two counters that may

be monitored either by the SMBus slave only device or by the LPC interface, which monitor the length of time VCC

and VTR are active.

The LPC47S45x incorporates a keyboard interface, SMSC's true CMOS 765B floppy disk controller, advanced digital

data separator, two 16C550 compatible UARTs, one Multi-Mode parallel port which includes ChiProtect circuitry plus

EPP and ECP, and Intelligent Power Management. The true CMOS 765B core provides 100% compatibility with IBM

PC/XT and PC/AT architectures in addition to providing data overflow and underflow protection.

The SMSC

advanced digital data separator incorporates SMSC's patented data separator technology, allowing for ease of

testing and use. The on-chip UARTs are compatible with the NS16C550. The parallel port is compatible with IBM

PC/AT architecture, as well as IEEE 1284 EPP and ECP. The LPC47S45x incorporates sophisticated power control

circuitry (PCC). The PCC supports multiple low power down modes.

The LPC47S45x supports the ISA Plug-and-Play Standard (Version 1.0a) and provides the recommended

functionality to support Windows 2000, Windows Me, and PC2001. The I/O Address, DMA Channel and Hardware

IRQ of each logical device in the LPC47S45x may be reprogrammed through the internal configuration registers.

There are 480 I/O address location options, a Serialized IRQ interface, and three DMA channels.

LPC47S45X Datasheet(PDF) 9 Page - SMSC Corporation