F71872
1 General Description
The F71872 is the featured IO chip specifically for PC system. Equipped with one IEEE 1284 parallel
port , two UART port and FDC. The F71872 provides SIR and key board controller compatible with PS/2
keyboard and mouse as well, integrated with hardware monitor, supports 11 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.
The F71872 provides flexible features for multi-directional application. For instance, supports CPU VID
(Intel CPU On The Fly) controlling and comply with VRM10.0, provides 24 GPIO pins which include
pulse/level mode selection, IRQ sharing function also designed in UART feature for particular usage and
accurate current mode H/W monitor will be worth in measurement of temperature.
Furthermore, the F71872 supports an automatic/dynamic over-voltage function (Vcore change) for
application of over-clocking or under clocking. This function provides a pin (VID_OTF#) by external trigger
signal to improve the CPU’s performance by voltage (Vcore) changing automatically when system is going to
run over-clocking or under-clocking. Due to achieve this action, suggest F75133S Loading Gauge can be the
part detects system/CPU loading to decide when issues the over-clocking/under-clocking and dynamic
signals for system executing. Briefly, user can gain more features on motherboard by these two parts which
improve performance and efficiency.
The F71872 is powered by 3.3V voltage, with the LPC interface in the package of 128-QFP.
2 Features
General Functions
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Comply with LPC Spec. 1.0
Support DPM (Device Power Management), ACPI
Support CPU VID (Intel CPU On The Fly) controlling and comply with VRM10.0
Vcore monitoring supports dynamic VID
Support automatic and dynamic vcore change function for over/under clocking use
24 GPIO Pins for flexible application
24/48 MHz clock input
FDC
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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
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July, 2007
V0.28P
FINTEK [ FEATURE INTEGRATION TECHNOLOGY INC. ]
