Entity io_FanControl

Block Diagram of io_FanControl

This module generates a PWM signal for a 3-pin (transistor controlled) or
4-pin fan header. The FPGAs temperature is read from device specific system
monitors (normal, user temperature, over temperature).

For example the Xilinx System Monitors are configured as follows:

                                                                |                                                                                        /-----\
Temp_ov  on=80  |       -       -       -       -       -       -       /-------/                               \
                                                                |                                                /                              |                                \
Temp_ov off=60  |       -       -       -       -       -       /       -       -       -       -       |       -       -       -       -       \----\
                                                                |                                        /                                      |                                                               \
                                                                |                                       /                                               |                                                        | \
Temp_us  on=35  |       -        /---/                                          |                                                        |      \
Temp_us off=30  |       -       /       -       -|-     -       -       -       -       -       |       -       -       -       -       -       -       -|-  \------\
                                                                |  /             |                                              |                                                        |                                       \
----------------|--------|------------|--------------|----------|---------
pwm =                                           |               min      |      medium          |               max                              |      medium  |       min

Generics

Name	Type	Default	Description
CLOCK_FREQ	FREQ
ADD_INPUT_SYNCHRONIZERS	boolean	TRUE
ENABLE_TACHO	boolean	FALSE

Ports

Name	Type	Direction	Description
Clock	std_logic	in	Global Control
Reset	std_logic	in
Fan_PWM	std_logic	out	Fan Control derived from internal System Health Monitor
Fan_Tacho	std_logic	in	Decoding of Speed Sensor (Requires ENABLE_TACHO)
TachoFrequency	std_logic_vector	out

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