W83977AF-A

This data sheet covers two products: W83977F/G, and W83977AF/AG whose pin assignment, and most of the functions are the same. W83977AF/AG is an advanced version of W83977F/G featuring the FIR function.

W83977F/G, W83977AF/AG are evolving products from Winbond's 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 in one chip --- plus additional powerful features: ACPI, 8042 keyboard controller with PS/2 mouse support, Real Time Clock, 14 general purpose I/O ports, full 16-bit address decoding, TV remote IR (Consumer IR, supporting NEC, RC-5, extended RC-5, and RECS-80 protocols). In addition, W83977AF/AG provides the functions of IrDA 1.1 (MIR for 1.152M bps or FIR for 4M bps).

The disk drive adapter functions of W83977F/G, W83977AF/AG include a floppy disk drive controller compatible with the industry standard 82077/ 765, data separator, write pre-compensation circuit,decode logic, data rate selection, clock generator, drive interface control logic, and interrupt/ DMA logic. The wide range of functions integrated onto the W83977F/G, W83977AF/AG greatly reduces the number of components required for interfacing with floppy disk drives. The W83977F/G,W83977AF/AG supports up to four 360K, 720K, 1.2M, 1.44M, or 2.88M disk drives and data transfer rates of 250 Kb/s, 300 Kb/s, 500 Kb/s,1 Mb/s, and 2 Mb/s.

The W83977F/G, W83977AF/AG provide two high-speed serial communication ports (UARTs), one of which supports serial Infrared communication. Each UART includes a 16-byte send/receive FIFO, a programmable baud rate generator, complete modem control capability, and a processor interrupt system. Both UARTs provide legacy speed with baud rate 115.2k and provide advanced speed with baud rate 230k, 460k, and 921k bps which support higher speed modems. W83977AF/AG alone provides independent 3rd UART (32-byte FIFO) dedicated for IR function.

The W83977F/G, W83977AF/AG supports one PC-compatible printer port (SPP), Bi directional Printer port (BPP) and also Enhanced Parallel Port (EPP) and Extended Capabilities Port (ECP). Through the printer port interface pins, also available are: Extension FDD Mode and Extension 2FDD Mode allowing one or two external floppy disk drives to be connected.

The configuration registers support mode selection, function enable/disable, and power down function selection. Furthermore, the configurable PnP features are compatible with the plug-and-play feature demand of Windows 95^TM, which makes system resource allocation more efficient than ever.

W83977F/G, W83977AF/AG provides functions that comply with ACPI (Advanced Configuration and Power Interface), which includes support of legacy and ACPI power management through SMI or SCI function pins. W83977F/G, W83977AF/AG also has auto power management to reduce power consumption.

The keyboard controller W83977AF-A  is based on 8042 compatible instruction set with a 2K Byte programmable ROM and a 256-Byte RAM bank. Keyboard BIOS firmware is available with optional AMIKEY^TM-2,Phoenix MultiKey/42TM, or customer code.

The W83977F/G, W83977AF/AG provides a set of flexible I/O control functions to the system designer through a set of General Purpose I/O ports. These GPIO ports may serve as simple I/O or may be individually configured to provide a pre-defined alternate function.

W83977F/G, W83977AF/AG is made to fully comply with Microsoft^TM PC97 Hardware Design
Guide. IRQs, DMAs, and I/O space resource are flexible to adjust to meet ISA PnP requirement. Full 16-bit address decoding is also provided. Moreover W83977F/G, W83977AF/AG is made to meet the specification of PC97's requirement in the power management: ACPI and DPM (Device Power Management).