GENERAL DESCRIPTION
The W83977EF is an evolving product from Winbonds most popular I/O chip W83877F --- which integrates the disk drive adapter, serial port (UART), IrDA 1.0 SIR, parallel port, configurable plugand-play registers for the whole chip --- plus additional powerful features: ACPI, 8042 keyboard controller with PS/2 mouse support, 14 general purpose I/O ports, full 16-bit address decoding, OnNow keyboard Wake-Up, OnNow mouse Wake-Up.

FEATURES
General
• Plug & Play 1.0A compatible
• Support 12 IRQs, 4 DMA channels, full 16-bit address decoding
• Capable of ISA Bus IRQ Sharing
• Compliant with Microsoft PC98 Hardware Design Guide
• Support DPM (Device Power Management), ACPI
• Report ACPI status interrupt by SCI# signal issued from any of the 12 IQRs pins or GPIO xx
• Programmable configuration settings
• single 24/48 Mhz clock input

FDC
• Compatible with IBM PC AT disk drive systems
• Variable write pre-compensation with track selectable capability
• Support vertical recording format
• DMA enable logic
• 16-byte data FIFOs
• Support floppy disk drives and tape drives
• Detects all overrun and underrun conditions
• Built-in address mark detection circuit to simplify the read electronics
• FDD anti-virus functions with software write protect and FDD write enable signal (write data signal was forced to be inactive)
• Support up to four 3.5-inch or 5.25-inch floppy disk drives
• Completely compatible with industry standard 82077
• 360K/720K/1.2M/1.44M/2.88M format; 250K, 300K, 500K, 1M, 2M bps data transfer rate
• Support 3-mode FDD, and its Win95 driver

UART
• Two high-speed 16550 compatible UARTs with 16-byte send/receive FIFOs
• MIDI compatible
• Fully programmable serial-interface characteristics:
    --- 5, 6, 7 or 8-bit characters
    --- Even, odd or no parity bit generation/detection
    --- 1, 1.5 or 2 stop bits generation
• Internal diagnostic capabilities:
    --- Loop-back controls for communications link fault isolation
    --- Break, parity, overrun, framing error simulation
• Programmable baud generator allows division of 1.8461 Mhz and 24 Mhz by 1 to (216-1)
• Maximum baud rate up to 921k bps for 14.769 Mhz and 1.5M bps for 24 Mhz

Infrared
• Support IrDA version 1.0 SIR protocol with maximum baud rate up to 115.2K bps
• Support SHARP ASK-IR protocol with maximum baud rate up to 57,600 bps

Parallel Port
• Compatible with IBM parallel port
• Support PS/2 compatible bi-directional parallel port
• Support Enhanced Parallel Port (EPP) − Compatible with IEEE 1284 specification
• Support Extended Capabilities Port (ECP) − Compatible with IEEE 1284 specification
• Extension FDD mode supports disk drive B; and Extension 2FDD mode supports disk drives A and B through parallel port
• Enhanced printer port back-drive current protection

Keyboard Controller
• 8042 based with optional F/W from AMIKKEYTM-2, Phoenix MultiKey/42TM or customer code
• With 2K bytes of programmable ROM, and 256 bytes of RAM
• Asynchronous Access to Two Data Registers and One status Register
• Software compatibility with the 8042 and PC87911 microcontrollers
• Support PS/2 mouse
• Support port 92
• Support both interrupt and polling modes
• Fast Gate A20 and Hardware Keyboard Reset
• 8 Bit Timer/ Counter
• Support binary and BCD arithmetic
• 6MHz, 8 MHz, 12 MHz, or 16 MHz operating frequency

General Purpose I/O Ports
• 14 programmable general purpose I/O ports; 6 dedicate, 8 optional
• General purpose I/O ports can serve as simple I/O ports, interrupt steering inputs, watching dog timer output, power LED output, infrared I/O pins, general purpose address decoder, KBC control I/O pins

OnNow Funtions
• Keyboard Wake-Up by programmable keys
• Mouse Wake-Up by programmable buttons

Package
• 128-pin PQFP