Nuvoton Technology Corp. 新唐科技 - LPC Super I/O for Desktop & Server
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LPC Super I/O for Desktop & Server 

Part No. NCT6775F
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The NCT6775F, a member of Nuvoton’s LPC Super I/O product line, supports serial port interface, parallel port interface, FDC, PS/2 interface, GPIO, hardware monitoring functions, Intel PECI, AMD SB-TSI, CIR functions, port 80 functions, digital-to-analog output and power saving at S5 state.
The NCT6775F monitors several critical parameters in PC hardware, including power supply voltages, fan speeds and temperatures. In terms of temperature monitoring, the NCT6775F adopts the Current Mode (dual current source) and thermistor sensor approach. The NCT6775F also supports the SMART FAN control system and SMART Tracking, which makes the system more stable and user-friendly.
The NCT6775F supports four – 360K, 720K, 1.2M, 1.44M, or 2.88M – disk drive types and data transfer rates of 250 Kb/s, 300 Kb/s, 500 Kb/s, 1 Mb/s, and 2 Mb/s. The disk drive adapter supports the functions of 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 NCT6775F provides one high-speed serial communication port (UART), which includes a 16-byte send/receive FIFO, a programmable baud rate generator, complete modem-control capability and a processor interrupt system. The UART supports legacy speeds up to 115.2K bps as well as even higher baud rates of 230K, 460K, or 921K bps to support higher speed modems.
The NCT6775F supports the PC-compatible printer port (SPP), the bi-directional printer port (BPP), the enhanced parallel port (EPP) and the extended capabilities port (ECP).
The NCT6775F provides flexible I/O control functions through a set of general purpose I/O (GPIO) ports. These GPIO ports may serve as simple I/O ports or may be individually configured to provide alternative functions.
The NCT6775F supports the SST (Simple Serial Transport) interface, Intel PECI (Platform Environment Control Interface) and AMD SB-TSI interface. The NCT6775F supports separated BUSSEL input and output pins for over-clocking. It also supports separated VID input and output pins for Vcore voltage adjustment.
The NCT6775F supports a processor VID to DAC (Digital to Analog Converter) output function. It also supports 3 DAC voltage outputs. All the above DACs could be programmed by BIOS or software.
The NCT6775F supports to decode port 80 diagnostic messages on the LPC bus. This could help on system power on debugging. It also supports two-color LED control to indicate system power states.
The configuration registers inside the NCT6775F support mode selection, function enable and disable, and power-down selection. Furthermore, the configurable PnP features are compatible with the plug-and-play feature in Windows, making the allocation of the system resources more efficient than ever.

  • Support disk drive adapter
  • Support 1 serial port (UART)
  • Support PC-compatible printer port (SPP) / Extended Capabilities Port (ECP) / Enhanced Parallel Port (EPP)
  • Support 8042 keyboard controller with PS/2 mouse support
  • Support general purpose I/O ports
  • Support CIR receiver and transmitter for Windows XP, Vista and Windows 7
  • Support PECI host, SST client, AMD SB-TSI interface
  • Support decode port 80 diagnostic messages on the LPC bus
  • Support EuP power saving while the system is at S5 state
  • Support SMBus isolation, SMBus master and slave.
  • Support separated BUSSEL input and output pins for over-clocking
  • Support a processor VID to DAC (Digital to Analog Converter) output function; 3 DAC voltage outputs
  • Support H/W Monitor functions, including voltage detection, temperature detection, fan speed detection and fan speed control.
Diagram N/A
Package 128-pin QFP
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