Signal Description
2.2PCI Express* Interface
Table 2.  | PCI Express* Interface Pins | 
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  | Signal  | I/O  | 
  | Description  | 
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  | REFCLKp/  | I  | PCI Express* Reference Clocks: 100 MHz differential clock pair  | |
  | REFCLKn  | |||
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  | |
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  | PCI Express* Serial Data Transmit: PCI Express* differential data transmit  | |
  | PETp[7:0]/  | 
  | signals  | |
  | O  | X8  | Mode: All PETp[7:0]/PETn[7:0] are used.  | |
  | PETn[7:0]  | |||
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  | X4  | Mode: Only PETp[3:0]/PETn[3:0] are used.  | |
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  | X1  | Mode: Either PETp[0]/PETn[0] is used or PETp[7]/PETn[7] is used.  | 
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  | PCI Express* Serial Data Receive: PCI Express* differential data receive  | |
  | PERp[7:0]/  | 
  | signals  | |
  | I  | X8  | Mode: All PERp[7:0]/PERn[7:0] are used.  | |
  | PERn[7:0]  | |||
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  | X4  | Mode: Only PERp[3:0]/PERn[3:0] are used.  | |
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  | X1  | Mode: Either PERp[0]/PERn[0] is used or PERp[7]/PERn[7] is used.  | 
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  | PCI Express* Compensation Inputs: Analog signals. Connect to a  | |
  | PE_RCOMP[1:0] | I  | 24.9 Ω ±1%   | |
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  | signals.  | |
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  | Total | 36  | 
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Intel® 41210 Serial to Parallel PCI Bridge Developer’s Manual  | 15  |