Intel E7-8891 v2 CM8063601377422 User Manual

Product codes
CM8063601377422
Page of 504
PCU Functional Description
66
Intel
®
 Xeon
® 
Processor E7-2800/4800/8800 v2 Product Family
Datasheet Volume Two: Functional Description, February 2014
10.2
Platform Environment Control Interface (PECI)
The Platform Environment Control Interface (PECI) uses a single wire for self-clocking 
and data transfer. The bus requires no additional control lines. PECI also includes 
variable data transfer rate established with every message. In this way, it is highly 
flexible even though underlying logic is simple.
The PECI bus offers:
• A wide speed range from 2 Kbps to 2 Mbps
• CRC check byte used to efficiently and automatically confirm accurate data delivery
• Synchronization at the beginning of every message minimizes device timing 
accuracy requirements
Note:
The PECI commands described in this document apply primarily to the processor E7 v2 
product family. 
10.2.1
PECI Client Capabilities
The processor PECI client is designed to support the following sideband functions:
• Processor, Memory Buffer and DRAM thermal management
• Platform manageability functions including thermal, power, and error monitoring
Figure 10-1. Power and Thermal Management Architecture Overview
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