General Description

The F71805 is the featured IO chip specifically for PC system. Equipped with one IEEE 1284 parallel port, two UART port and FDC, F71805 provides SIR and Flash ROM Interface. Integrated with hardware monitor, F71805 supports 9 sets of voltage sensor and 4 voltage fault signal outputs, 3 sets of creative auto-controlling fans and 3 temperature sensor pins for the accurate current type temp. measurement for CPU thermal diode or external transistors 2N3906.

Features

General Functions

● Comply with LPC Spec. 1.0

● Supports 24 GPIO pins. One set of GPIO supports High/Low Level/Pulse selection.

● 48 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 under run conditions

● Built-in address mark detection circuit to simplify the read electronics

● 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 Win95/98/2K/XP driver

UART

● Two high-speed 16C550 compatible UART with 16-byte FIFOs

● Fully programmable serial-interface characteristics

● Baud rate up to 115.2K