SPRACV3 December   2020 AM6412 , AM6422 , AM6442

 

  1.   Trademarks
  2. 1Simulations
    1. 1.1 SerDes
      1. 1.1.1 Introduction
      2. 1.1.2 Simulator Settings and Model Usage
      3. 1.1.3 Simulation Parameters
      4. 1.1.4 Simulation Methodology
      5. 1.1.5 Reviewing Simulation Results
  3. 2Models
    1. 2.1 IBIS-AMI Model Kit
    2. 2.2 The Kit Structure
    3. 2.3 Contents of the Kit
    4. 2.4 IBIS Analog Models
    5. 2.5 Algorithmic Models
      1. 2.5.1 Transmitter (Tx) Model
        1. 2.5.1.1  TX AMI Parameters for Gen 1
        2. 2.5.1.2  TX AMI Parameters for Gen 2
        3. 2.5.1.3  TX AMI Parameters for Gen 3
        4. 2.5.1.4  TX AMI Parameters for Sgmii
        5. 2.5.1.5  TX AMI Parameters for Qsgmii
        6. 2.5.1.6  TX AMI Parameters for USB3.0
        7. 2.5.1.7  TX AMI Parameters for USB3.1
        8. 2.5.1.8  TX AMI Parameters for USXGMII
        9. 2.5.1.9  TX AMI Parameters for Display Port
        10. 2.5.1.10 Transmitter Specifications
        11. 2.5.1.11 TX_Jitter Injection Parameters
      2. 2.5.2 Receiver (Rx) Model
        1. 2.5.2.1 RX AMI Parameters
        2. 2.5.2.2 Rx Jitter Injection Parameters
    6. 2.6 Valid Simulation Condition
    7. 2.7 Eye Mask Requirement

2.5.1.11 TX_Jitter Injection Parameters

The TX AMI model contains several jitter-related parameters that were introduced with IBIS BIRD 123, and will be incorporated into a future version of the IBIS specification. Most commercial EDA tools that support AMI simulation have already incorporated support for IBIS BIRD 123. If the EDA tool you are using does not yet support the BIRD 123 parameters, do the following:

  1. Open the AMI file for editing.
  2. Delete these parameters.
  3. Set their equivalent functionality directly in the EDA tool. Allegro Sigrity SystemSI supports this functionality.

Allegro Sigrity SystemSI supports thisfunctionality.

The Tx AMI file contains the following jitter parameters:

(Tx_Rj (Usage Info) (List 0.0031 0.0054 0.001064) (Type UI)
     (Description "Tx Random Jitter in UI. It is RMS UI. Values are for BEST TYP WORST corner respectively"))
(Tx_Dj (Usage Info) (List 0.00068 0.01288 0.03168) (Type UI)
     (Description "Tx Bounded Jitter in UI. It is half of pk-to-pk UI. Values are for BEST TYP WORST corner, respectively")) (Tx_DCD (Usage Info) (List 0.0005 0.00064 0.00112) (Type UI)
     (Description "TX Duty Cycle Distortion in UI. Values are for BEST TYP WORST corner respectively"))
Note: Above jitter numbers are for PCIe Gen3.