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1. INTRODUCtiON..................................................................................................................7
1.1. TERMS AND ACRONYMS .................................................................................................. 7 1.2. OBJECTIVE OF THE SPECIFICATION................................................................................... 8 1.3. REFERENCE DOCUMENTS................................................................................................. 5 8 1.4. DOCUMENTATION CONVENTIONS .................................................................................... 8 1.5. CABLE APPLICATIONS...................................................................................................... 9 2. ELECTRICAL OVERVIEW .............................................................................................11 2.1. PCI EXPRESS SIGNALS................................................................................................... 11 10 2.1.1. Interconnect ............................................................................................................ 11 2.1.2. Electrical Budgets................................................................................................... 13 2.1.3. Eye Diagrams Compliance Measurements............................................................. 18 2.2. AUXILIARY SIGNALS...................................................................................................... 19 2.2.1. Cable Reference Clock............................................................................................ 20 15 2.2.2. Cable Presence Detect............................................................................................ 25 2.2.3. Power ...................................................................................................................... 28 2.2.4. ESD ......................................................................................................................... 28 2.3. L2 POWER STATE TRANSITION ...................................................................................... 29 3. CABLE CONNECTOR DEFINITION..............................................................................30 20 3.1. SIGNAL DESCRIPTION .................................................................................................... 30 3.1.1. PCI Express ............................................................................................................ 30 3.1.2. CREFCLK............................................................................................................... 30 3.1.3. Presence Detect ...................................................................................................... 30 3.1.4. Power ...................................................................................................................... 30 25 3.2. BOARD CONNECTOR ...................................................................................................... 30 3.2.1. Description.............................................................................................................. 30 3.2.2. Physical and Mechanical Performance .................................................................. 30 3.2.3. Electrical Performance........................................................................................... 31 3.2.4. Environmental Performance................................................................................... 32 30 3.2.5. x1 Link..................................................................................................................... 32 3.2.6. x4 Link..................................................................................................................... 32 3.2.7. x8 Link..................................................................................................................... 32 3.2.8. x16 Link................................................................................................................... 33 3.3. SHIELDING ..................................................................................................................... 33 35 3.4. KEYING......................................................................................................................... 33 3.5. MECHANICAL................................................................................................................. 33 4. CABLE SPECIFICATION.................................................................................................34 4.1. INTRODUCTION .............................................................................................................. 34 4.2. REQUIREMENTS.............................................................................................................. 34 40 4.2.1. Physical and Mechanical Performance .................................................................. 34 
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