Entity: io_FanControl

Diagram

FREQ CLOCK_FREQ boolean ADD_INPUT_SYNCHRONIZERS boolean ENABLE_TACHO std_logic Clock std_logic Reset std_logic Fan_Tacho std_logic Fan_PWM std_logic_vector(15 downto 0) TachoFrequency

Description

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Authors: Patrick Lehmann

Entity: Generic Fan Controller

Description:

.. code-block:: none

    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

License:

Copyright 2007-2015 Technische Universitaet Dresden - Germany Chair of VLSI-Design, Diagnostics and Architecture

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and

limitations under the License.

Generics

Generic name Type Value Description
CLOCK_FREQ FREQ
ADD_INPUT_SYNCHRONIZERS boolean TRUE
ENABLE_TACHO boolean FALSE

Ports

Port name Direction Type Description
Clock in std_logic Global Control
Reset in std_logic
Fan_PWM out std_logic Fan Control derived from internal System Health Monitor
Fan_Tacho in std_logic Decoding of Speed Sensor (Requires ENABLE_TACHO)
TachoFrequency out std_logic_vector(15 downto 0)

Signals

Name Type Description
PWM_PWMIn std_logic_vector(PWM_RESOLUTION - 1 downto 0)
PWM_PWMOut std_logic

Constants

Name Type Value Description
TIME_STARTUP_INVERSE FREQ 2 Hz StartUp time
PWM_RESOLUTION positive 4 4 Bit resolution => 0 to 15 steps
PWM_FREQ FREQ 10 Hz
TACHO_RESOLUTION positive 8

Instantiations

Description
PWM signal modulator
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