Intel E5-2600, E5-4600 Platform Environmental Control Interface Peci, Input Device Hysteresis

Electrical Specifications

7.1.5Platform Environmental Control Interface (PECI)

PECI is an Intel proprietary interface that provides a communication channel between Intel processors and chipset components to external system management logic and thermal monitoring devices. The processor contains a Digital Thermal Sensor (DTS) that reports a relative die temperature as an offset from Thermal Control Circuit (TCC) activation temperature. Temperature sensors located throughout the die are implemented as analog-to-digital converters calibrated at the factory. PECI provides an interface for external devices to read processor temperature, perform processor manageability functions, and manage processor interface tuning and diagnostics. Please refer to Section 2.5, “Platform Environment Control Interface (PECI)” for processor specific implementation details for PECI.

The PECI interface operates at a nominal voltage set by VTTD. The set of DC electrical specifications shown in Table 7-17is used with devices normally operating from a VTTD interface supply.

7.1.5.1Input Device Hysteresis

The PECI client and host input buffers must use a Schmitt-triggered input design for improved noise immunity. Please refer to Figure 7-1and Table 7-17.

Figure 7-1. Input Device Hysteresis

	VTTD
	Maximum VP	PECI High Range
	Minimum VP		Minimum	Valid Input
			Hysteresis	Signal Range
Maximum VN
Minimum VN		PECI LowRange
	PECI Ground

7.1.6System Reference Clocks (BCLK{0/1}_DP, BCLK{0/ 1}_DN)

The processor core, processor uncore, Intel® QuickPath Interconnect link, PCI Express* and DDR3 memory interface frequencies) are generated from BCLK{0/1}_DP and BCLK{0/1}_DN signals. There is no direct link between core frequency and Intel QuickPath Interconnect link frequency (for example, no core frequency to Intel QuickPath Interconnect multiplier). The processor maximum core frequency, Intel QuickPath Interconnect link frequency and DDR memory frequency are set during manufacturing. It is possible to override the processor core frequency setting using software. This permits operation at lower core frequencies than the factory set maximum core frequency.

154	Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
	Datasheet Volume One