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1. Introduction

The Graphcore IPU hardware connects to the server chassis using PCIe. The PCIe CEM interface includes an SMBus which can be used by the chassis to read out specific parameters from the PCIe card.

1.1. Abbreviations

Name	Description
ACK	Acknowledge bit
ARP	Address Resolution Protocol
CEM	Card Electromechanical specification
ICU	IPU Control Unit (the microcontroller on the PCIe card)
IPU	Intelligence Processing Unit
NACK	A `1` in the ACK bit position
PCIe	Peripheral Component Interconnect Express
PEC	Packet Error Code
POST	Power On Self-Test
RMA	Return Machine Authorisation process
SMBus	System Management Bus

See the Graphcore glossary for definitions of other Graphcore-specific terminology.

1.2. Conventions

The term word stands for 16 bits.