GENERAL DESCRIPTION
The LPC47B34x* is a 3.3V PC99 compliant Super I/O controller. The LPC47B34x 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 62 GPIO pins and ISA IRQ to serial IRQ conversion.

FEATURES
• 3.3 Volt Operation (5V Tolerant)
• LPC Interface
• Floppy Disk Controller (Supports 2 FDCs)
• Multi-Mode Parallel Port
• Two Full UARTs
• 8042 Keyboard Controller (Internal Latch on IRQ1 and IRQ12)
• Programmable Wakeup Event Interface (nIO_PME Pin)
• SMI Pin
• GPIOs (62)
• ISA IRQ to Serial IRQ Conversion (11 Pins)
• WDT
• Security Register
• ACPI Support Register for Monitoring System Sleep State and SMI Generation
• Intrusion Detection
• LED Control
• Low Battery Warning
• Battery Backup of Certain Wakeup Events
• XNOR Chain
• PC99 and ACPI 1.0 Compliant
• ISA Plug-and-Play Compatible Register Set
• Intelligent Auto Power Management
• 2.88MB Super I/O Floppy Disk Controller
   - Licensed CMOS 765B Floppy Disk Controller
   - Software and Register Compatible with SMSCs Proprietary 82077AA Compatible Core
   - 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 Power-down Modes for Reduced Power Consumption
   - DMA Enable Logic
   - Data Rate and Drive Control Registers
   - 480 Address, up to 15 IRQ and 3 DMA Options
• 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 NS16C550 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
   - IrDA 1.0, HP-SIR, ASK IR Support
• 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 Against Damage Due to Printer PowerOn
   - 480 Address, up to 15 IRQ and 3 DMA Options
• LPC Bus (Pin Reduced ISA) Host Interface
   - Multiplexed Command, Address and Data Bus
   - 8-Bit I/O Transfers
   - 8-Bit DMA Transfers
   - 16-Bit Address Qualification
   - Serial IRQ Interface Compatible with Serialized IRQ Support for PCI Systems
   - Power Management Event (nIO_PME) Interface Pin
• 128 Pin QFP Package