Manual

EBM-CX700 Series
20 EBM-CX700 Series User’s Manual
1.6.4 VIA VT1211 Super I/O
The VT1211 is a full function Super I/O chip with a Floppy Disk Controller, an IEEE-1284
Parallel Port interface, two 16C550-UART-based serial port interfaces, a VFIR (Very Fast
IR) Controller, a game port which supports 2 joysticks, a MIDI interface, and a 4M
Flash-ROM interface.
The integrated Hardware Monitor Controller controls the speed of 2 fans, monitors 2 fan
tachometers, and has a Pentium II thermal diode and 5 universal analog inputs for
measuring voltage or temperature (by connecting external thermistors).
The VT1211 meets the "Microsoft PC98 and PC99 system design guide" requirements and
is ACPI ready, and a hardware monitor engine is built in to monitor system health.
Key Features
• LPC (Low Pin Count) Interface
— Complies with Intel Low Pin Count Interface Specification Revision 1.0
— Supports LDRQ#, SERIRQ protocols
• Hardware Monitor Controller
— Built-in 8-bit Analog to Digital Converter
— One thermal input for Pentium II type thermal diode
— 1 intrinsic Vcc voltage monitor input
— 5 external Universal Channels for monitor inputs
— Monitors 2 fan tachometer inputs
— 1 chassis open detection input
— WatchDog comparison of all monitored values
— Provides VID0 - VID4 support for P6 class CPU
— Over temperature indicator output
— Over limit of fan and voltage indicator output
— Provides beep tone warning
— Serial Bus slave mode supported
• Fan Speed Controller
— Provides fan on-off and speed control
— Supports 2 programmable Pulse Width Modulation (PWM) outputs
— Duty cycle resolution of 1/256
• Flash-ROM Interface
— Supports up to 4MB flash ROM
• SmartGuardian Controller
— Provides automatic temperature to fan speed control
— Supports mix-and-match for temperature inputs and fan speed control outputs