AMD AX2000DMT3C User Guide - Page 52

Preliminary Information AMD Athlon™ XP Processor Model 6 Data Sheet 24309E-March 2002 Thermal Protection Characterization. The following section describes parameters relating to thermal protection. The implementation of thermal control circuitry to control processor temperature is left to the manufacturer to determine how to implement. Thermal limits in motherboard design are necessary to protect the processor from thermal damage. TSHUTDOWN is the temperature for thermal protection circuitry to initiate shutdown of the processor. TSD_DELAY is the maximum time allowed from the detection of the over-temperature condition to processor shutdown to prevent thermal damage to the processor. Systems that do not implement thermal protection circuitry or that do not react within the time specified by TSD_DELAY can cause thermal damage to the processor during the unlikely events of fan failure or powering up the processor without a heat-sink. The processor relies on thermal circuitry on the motherboard to turn off the regulated core voltage to the processor in response to a thermal shutdown event. Thermal protection circuitry reference designs and thermal solution guidelines are found in the following documents: ■ AMD Athlon™ Processor-Based Motherboard Design Guide, order# 24363 ■ Thermal Diode Monitoring Circuits, order# 25658 ■ AMD Thermal, Mechanical, and Chassis Cooling Design Guide, order# 23794 ■ http://www1.amd.com/products/athlon/thermals Table 15 on page 41 shows the TSHUTDOWN and TSD_DELAY specifications for circuitry in motherboard design necessary for thermal protection of the processor. 40 Electrical Data Chapter 7