Intel X38ML Product Specification - Page 81
Standard Fan Management
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Intel® Server Board X38ML Platform Management 5.15.1.2 IERR Monitoring The BMC monitors the internal error (IERR) signal from each processor and maps it to the IERR offset of the associated processor status sensor. 5.15.2 Digital Thermal Sensor The processor supports a digital thermal sensor that provides a relative temperature reading defined as the number of degrees below the processor's thermal throttling trip point, also called the PROCHOT threshold. When a processor reaches this temperature, the processor's PROCHOT signal asserts, indicating one or more of the processor's built-in Thermal Control Circuits (TCC) has been activated to limit further increases in temperature by throttling the processor. The digital thermal sensor reading value is always less than or equal to zero. A reading of zero indicates the PROCHOT threshold is reached. The reading remains at zero until the temperature goes back below the PROCHOT threshold. The digital thermal sensors are located on the processor Platform Environment Control Interface (PECI) bus. The default SDR configuration has no thresholds programmed or event generation enabled because the sensor is expected to reach its maximum value of zero during normal operation. 5.15.2.1 PECI Interface The platform environment control interface is a one-wire, self-clocked bus interface that provides a communication channel between Intel processors and chipset components to the BMC's integrated PECI subsystem. The PECI bus communicates environment information such as temperature between the managed components, referred to as the PECI client devices, and the management controller, referred to as the PECI system host. The PECI standard supersedes older methods, such as the thermal diode, for gathering thermal data. Refer to the Platform Environment Control Interface (PECI) Reference Firmware External Architecture Specification for more information about this interface standard. 5.16 Standard Fan Management The BMC controls and monitors the system fans. Each fan is associated with a fan speed sensor that detects fan failure and may also be associated with a fan presence sensor for hotswap support. For redundant fan configurations, the fan failure and presence status determines the fan redundancy sensor state. The system fans are divided into fan domains, each of which has a separate fan speed control signal and a separate configurable fan control policy. A fan domain can have a set of temperature and fan sensors associated with it. These are used to determine the current fan domain state. A fan domain has three states: sleep, nominal, and boost. The sleep and boost states have fixed fan speeds, although they can be configured by OEM SDRs. The nominal state has a variable speed determined by the fan domain policy. See Section 5.16.2. An OEM SDR record is used to configure the fan domain policy. The Set SM Signal command can be Revision 1.3 69 Intel order number E15331-006