GENERAL DESCRIPTION

The LPC47B27x* is a 3.3V PC98/PC99 compliant Super I/O controller. The LPC47B27x implements the LPC interface, a pin reduced ISA bus interface which provides the same or better performance as the ISA/X-bus with a substantial savings in pins used. The LPC47B27x provides fan control through two fan speed control output pins and two fan tachometer input pins. It also provides 37 general purpose input/output (GPIO) pins, a dual game port interface, MPU-401 MIDI support and ISA IRQ to Serial IRQ conversion.

FEATURES

? 3.3 Volt Operation, 5 Volt Tolerant

? LPC Interface

? Fan Control

- Fan Speed Control Outputs (2)

- Fan Tachometer Inputs (2)

? Programmable Wake-up Event Interface

? PC98, PC99, and ACPI 1.0 Compliant

? Dual Game Port Interface

? MPU-401 MIDI Support

? General Purpose Input/Output Pins (37)

? ISA IRQ to Serial IRQ Conversion

? ISA Plug-and-Play Compatible Register Set

? Intelligent Auto Power Management

? System Management Interrupt

? 2.88MB Super I/O Floppy Disk Controller

- Licensed CMOS 765B Floppy Disk Controller

- Software and Register Compatible with SMSCs Proprietary 82077AA Compatible Core

- Supports Two Floppy Drives Directly

- Configurable Open Drain/Push-Pull Output Drivers

- Supports Vertical Recording Format

- 16-Byte Data FIFO

- 100 IBM? Compatibility

- Detects All Overrun and Underrun Conditions

- Sophisticated Power Control Circuitry (PCC) Including Multiple Powerdown Modes for Reduced Power Consumption

- DMA Enable Logic

- Data Rate and Drive Control Registers

- 480 Address, Up to 15 IRQ and Three DMA Options

? Floppy Disk Available on Parallel Port Pins

? Enhanced Digital Data Separator

- 2 Mbps, 1 Mbps, 500 Kbps, 300 Kbps, 250 Kbps Data Rates

- Programmable Precompensation Modes

? Keyboard Controller

- 8042 Software Compatible

- 8 Bit Microcomputer

- 2k Bytes of Program ROM

- 256 Bytes of Data RAM

- Four Open Drain Outputs Dedicated for Keyboard/Mouse Interface

- Asynchronous Access to Two Data Registers and One Status Register

- Supports Interrupt and Polling Access

- 8 Bit Counter Timer

- Port 92 Support

- Fast Gate A20 and KRESET Outputs

? Serial Ports

- Two Full Function Serial Ports

- High Speed NS16C550A Compatible UARTs with Send/Receive 16-Byte FIFOs

- Supports 230k and 460k Baud Programmable Baud Rate Generator Modem Control Circuitry

- 480 Address and 15 IRQ Options

? Infrared Port

- Multiprotocol Infrared Interface

- 32-Byte Data FIFO

- IrDA 1.0 Compliant

- Consumer IR

- SHARP ASK IR

- 480 Address, Up to 15 IRQ and Three DMA Options

? Multi-Mode? Parallel Port with ChiProtect?

- Standard Mode IBM PC/XT?, PC/AT?, and PS/2? Compatible Bidirectional Parallel Port

- Enhanced Parallel Port (EPP) Compatible - EPP 1.7 and EPP 1.9 (IEEE 1284 Compliant)

- IEEE 1284 Compliant Enhanced Capabilities Port (ECP)

- ChiProtect Circuitry for Protection

- 960 Address, Up to 15 IRQ and Three DMA Options

? LPC Interface

- Multiplexed Command, Address and Data Bus

- Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems

- PME Interface

? 100 Pin QFP Lead-Free RoHS Compliant Package