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
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