Intel SE7525GP2 Product Specification - Page 22
Processor Voltage Regulator Devices VRDs, Reset Configuration Logic, Processor Module Presence - server motherboard
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Functional Architecture Intel® Server Boards SE7320SP2 and SE7525GP2 3.1.1 Processor Voltage Regulator Devices (VRDs) The server board has two voltage regulator devices (VRDs) that provide the appropriate voltages to the installed processors. Each VRD is compliant with the VRD 10.1 specification and is designed to support Intel® Xeon® processors that require up to a sustained maximum current of 105 amps and peak support of 120 amps. The server boards support the flexible motherboard (FMB) specification for all 800-MHz FSB Intel® Xeon® processors with respect to current requirements and processor speed requirements. FMB is an estimation of the maximum values the 800-MHz FSB versions of the Intel Xeon processors will have over their lifetime. The value is only an estimate and actual specifications for future processors may differ. At present, the current demand per FMB is a sustained maximum of a 105 amps and peak support of 120 amps. 3.1.2 Reset Configuration Logic The BIOS determines the processor stepping, cache size, etc through the CPUID instruction. All processors in the system must operate at the same frequency; have the same cache sizes and same VID. No mixing of product families is supported. Processors run at a fixed speed and cannot be programmed to operate at a lower or higher speed. 3.1.3 Processor Module Presence Detection The server boards provide logic to detect the presence and identity of installed processors. In dual processor configurations, the onboard mini-baseboard management controller (mBMC) must read the processor voltage identification (VID) bits for each processor before turning on the VRD. If the VIDs of the two processors are not identical, then the mBMC will not turn on the VRD. Prior to enabling the embedded VRD, circuitry on the server board ensures that the following criteria are met: In a uni-processor configuration, processor 1 is installed. Only supported processors are installed in the system to prevent damage to the MCH. In dual processor configurations, both processors support the same FSB frequency. 3.1.4 GTL2006 The GTL2006 is a 13-bit translator designed for 3.3V to GTL/GTL+ translations to the system bus. The translator incorporates all the level shifting and logic functions required to interface between the processor subsystem and the rest of the system. 10 Revision 4.0