Features: General
· Plug & Play 1.0A Compliant
· Support 13 IRQs, 4 DMA channels, full 16-bit addresses decoding
· Capable of ISA Bus IRQ Sharing
· Compliant with Microsoft PC97 Hardware Design Guide
• Support DPM (Device Power Management), ACPI
· Programmable configuration settings
· 24 or 14.318 Mhz clock input
FDC
· Compatible with IBM PC AT disk drive systems
· Variable write pre-compensation with track selectable capability
· Support vertical recording format
· DMA enable logic
· 16-byte data FIFOs
· Support 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 was forced to be inactive)
· Support 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
• Support 3-mode FDD, and its Win95 driver
UART
· Two high-speed 16550 compatible UARTs with 16-byte send/receive FIFOs
· 3rd UART with 32-byte send/receive FIFO is supported for IR function [W83977AF only]
· 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 up to 921k bps for 14.769 Mhz and 1.5M bps for 24 MhzPinout
Specifications
| PARAMETER |
RATING |
UNIT |
| Power Supply Voltage |
-0.5 to 7.0 |
V |
| Input Voltage |
-0.5 to VDD+0.5 |
V |
| RTC Battery Voltage VBAT |
4.0 to 1.8 |
V |
| Operating Temperature |
0 to +70 |
° C |
| Storage Temperature |
-55 to +150 |
° C |
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.DescriptionThis data sheet covers two products: W83977F, and W83977AF whose pin assignment, and most of the functions are the same. W83977AF is an advanced version of W83977F featuring the FIR function.
W83977F/ AF is an evolving product 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 plugand- 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 provides the functions of IrDA 1.1 (MIR for 1.152M bps or FIR for 4M bps).
The disk drive adapter functions of W83977F/ AF 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/ AF greatly reduces the number of components required for interfacing with floppy disk drives. The W83977F/ AF 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/ AF provides 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 alone provides independent 3rd UART (32-byte FIFO) dedicated for IR function.
The W83977F/ AF 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 95TM, which makes system resource allocation more efficient than ever.
W83977F/ AF 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/ AF also has auto power management to reduce power consumption.
The keyboard controller W83977AF 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 AMIKEYTM -2, Phoenix MultiKey/42TM, or customer code.
The W83977F/ AF 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/ AF is made to fully comply with MicrosoftTM 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/ AF is made to meet the specification of PC97's requirement in the power management: ACPI and DPM (Device Power Management).
W83977AF Data Sheet
