5.11.2. Fan controller system
The Fan board has a CPLD to do the fan controller function. The CPLD on the Fan board can control the
Fan’s PWM signal for adjust Fan speed and count the Fan’s Tach signal for Fan speed reporting. CPU
can read the thermal sensor to get thermal information, and then adjust Fan speed to reduce system’s
thermal. The Fan’s CPLD had included I2C thermal watchdog to avoid system shutdown. If the register
count to zero, the Fan speed will be set to high speed.
The CPLD information is “CPLD 5M1270ZF256C5N 3.3V FBGA256 LT/LF ALTERA”
Front to Back Fan module with red color handle
Back to Front Fan module with blue color handle
Table 28 Fan Module Speed
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