GENERAL DESCRIPTION
One of Winbonds popular series of I/O chips, the W83877F integrates a disk drive adapter, serial port (UART), parallel port, IDE bus interface, and game port decoder onto a single chip. The W83877F is an enhanced version of the W83777F, with additional powerful features such as configurable plug-and-play registers for the whole chip and infrared support in one of the serial ports.

FEATURES
FDC:
● Compatible with IBM PC AT disk drive systems
● Variable write pre-compensation with track selectable capability
● DMA enable logic
● Non-burst mode DMA option
● Supports floppy disk drives and tape drives
● Detects all overrun and underrun conditions
● Data rate and drive control registers
● Built-in address mark detection circuit to simplify the read electronics
● IBM PC system address decoder
● Supports up to two embedded hard disk drives (IDE AT BUS)
● Single 24 MHz crystal input
● FDD anti-virus functions with software write protect and FDD write enable signal, write data signal force inactive
● Supports 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 bps data transfer rate
● Supports vertical recording format
● 16-byte data FIFOs

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)

Parallel Port:
● Compatible with IBM parallel port
● Supports parallel port with bidirectional lines
● Supports Enhanced Parallel Port (EPP)
   - Compatible with IEEE 1284 specification
● Supports Extended Capabilities Port (ECP)
   - Compatible with IEEE 1284 specification
● Extension FDD mode supports disk drive B through parallel port
● Extension Adapter Mode supports pocket devices through parallel port
● Extension 2FDD mode supports disk drives A and B through parallel port
● JOYSTICK mode supports joystick through parallel port

Others:
● Programmable configuration settings
● Immediate or automatic power-down mode for power management
● All hardware power-on settings have internal pull-up or pull-down resistors as default value
● Packaged in 100-pin QFP
● Configurable Plug and Play registers
● Infrared communication port