Features: FDC:
· Compatible with IBM PC AT disk drive systems
· Variable write pre-compensation with track selectable capability
· DMA enable logic
· Non-burst mode DMA option
· Supports floppy disk drives and tape drives
· Detects all overrun and underrun conditions
· Data rate and drive control registers
· Built-in address mark detection circuit to simplify the read electronics
· IBM PC system address decoder
· Supports up to two embedded hard disk drives (IDE AT BUS)
· Single 24 MHz crystal input
· FDD anti-virus functions with software write protect and FDD write enable signal, write data signal
force 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 bps data transfer rate
· Supports vertical recording format
· 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)
Parallel Port:
· Compatible with IBM parallel port
· Supports parallel port with bidirectional lines
· 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 through parallel port
· Extension Adapter Mode supports pocket devices through parallel port
· Extension 2FDD mode supports disk drives A and B through parallel port
· JOYSTICK mode supports joystick through parallel port
Others:
· Programmable configuration settings
· Immediate or automatic power-down mode for power management
· All hardware power-on settings have internal pull-up or pull-down resistors as default value
· Packaged in 100-pin QFP
· Configurable Plug and Play registers
· Infrared communication portPinout
Specifications
| PARAMETER |
RATING |
UNIT |
| Power Supply Voltage |
-0.5 to 7.0 |
V |
| Input Voltage |
-0.5 to VDD+0.5 |
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.DescriptionOne of Winbond's popular series of I/O chips, the W83877F integrates a disk drive adapter, serial port (UART), parallel port, IDE bus interface, and game port decoder onto a single chip. The W83877F is an enhanced version of the W83777F, with additional powerful features such as configurable plug-and-play registers for the whole chip and infrared support in one of the serial ports.
The disk drive adapter functions of the W83877F 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 and DMA logic. The wide range of functions integrated onto the W83877F greatly reduces the number of components required for interfacing with floppy disk drives. The W83877F supports 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, and 1 Mb/S.
The W83877F 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.
The W83877F supports one PC-compatible printer port. Additional bidirectional I/O capability is available by hardware control or software programming. The parallel port also supports the Enhanced Parallel Port (EPP) and Extended Capabilities Port (ECP).
The W83877F supports two embedded hard disk drive (AT bus) interfaces and a game port with decoded read/write output. The chip's Extension FDD Mode and Extension 2FDD Mode allow one or two external floppy disk drives to be connected to the computer through the printer interface pins in notebook computer applications.
The Extension Adapter Mode of the W83877F allows pocket devices to be installed through the printer interface pins in notebook computer applications according to a protocol set by Winbond, but with upgraded performance. The JOYSTICK mode allows a joystick to be connected to a parallel port with a signal switching cable.
The configuration registers W83877F support mode selection, function enable/disable, and power down function selection. Moreover, the configurable PnP registers are compatible with the plug-and-play feature in Windows 95TM , which makes system resource allocation more efficient than ever.
W83877F Data Sheet
