GENERAL DESCRIPTION
W83877TF/TG is an enhanced version from Winbonds most popular I/O chip W83877F --- which integrates the disk drive adapter, serial port (UART), IrDA 1.0 SIR, parallel port, configurable Plug-and-Play registers for the whole chip --- plus additional powerful features: ACPI / legacy power management, serial IRQ, and IRQ sharing.

FEATURES
General:
• Plug & Play 1.0A Compliant
• Support 8 IRQs (ISA), or 15 IRQs (Serial IRQ), 3 DMA channels, and 480 re-locatable address
• Capable of ISA Bus IRQ Sharing
• Comply with Microsoft PC 97 Hardware Design Guide
• Support DPM (Device Power Management), ACPI
• Report ACPI status interrupt by SCI signal from SCI pin, serial IRQ IRQSER pin, or IRQ A~H pins
• Single 24MHz/48MHZ clock input

FDC:
• Compatible with IBM PC AT disk drive systems
• Variable write pre-compensation with track selectable capability
• DMA enable logic
• Supports 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 signalwas forced to be 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, 2M bps data transfer rate
• Supports vertical recording format
• Support 3-mode FDD, and its Win95 driver
• 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)
• Maximum baud rate is up to 921k bps for 14.768MHz and 1.5M bps for 24MHz

Infrared:
• Supports IrDA version 1.0 SIR protocol with maximum baud rate up to 115.2K bps
• Supports SHARP ASK-IR protocol with maximum baud rate up to 57600 bps

Parallel Port:
• Compatible with IBM parallel port
• Supports PS/2 compatible bi-directional parallel port
• 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; and Extension 2FDD mode supports disk drives A and B through parallel port
• Enhanced printer port back-drive current protection

Others:
• Programmable configuration  settings
• Immediate or automatic power-down mode for the power management
• All hardware power-on settings have internal pull-up or pull-down resistors as default value
• Dedicated Infrared Communication Pins

Package:
• 100-pin QFP (W83877TF/TG), and also 100-pin LQFP (W83877TD/TG)