GENERAL DESCRIPTION
The W83977EF/CTF 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, and configurable plug-and-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 and OnNow CIR(W83977CTF only) Wake-Up.

FEATURES
General
 • Plug & Play 1.0A compatible
 • Supports 12 IRQs, 4 DMA channels, full 16-bit address decoding
 • Capable of ISA Bus IRQ Sharing
 • Compliant with Microsoft PC98 Hardware Design Guide
 • Supports DPM (Device Power Management), ACPI
 • Reports 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
 • Supports vertical recording format
 • DMA enable logic
 • 16-byte data FIFOs
 • 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 signal is 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 3-mode FDD, and its Win95 driver
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