PCE外部布线规范,PCI Express External Cabling Specification

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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