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

2.5.1.10 Transmitter Specifications

Transmitter IO allows de-emphasis options as per PCIe3.0 guidelines.

Table 2-4 Transmitter Specifications
Preset Number (see Note (1)) Preshoot (dB) De-Emphasis (dB) C-1 C+1 Va.Vd Vb/Vd Vc/Vd
P4 0.0 0.0 0.000 0.000 1.000 1.000 1.000
P1 0.0 -3.5 ±1 dB 0.000 -0.167 1.000 0.668 0.668
P0 0.0 -6.0 ± 1.5 dB 0.000 -0.250 1.000 0.500 0.500
P9 3.5 ± 1 dB 0.0 -0.166 0.000 0.688 0.688 1.000
P8 3.5 ± 1 dB -3.5 ±1 dB -0.125 -0.125 0.750 0.500 0.750
P7 3.5 ± 1 dB -6.0 ± 1.5 dB -0.100 -0.200 0.800 0.400 0.600
P5 1.9 ± 1 dB 0.0 -0.100 0.000 0.800 0.800 1.000
P6 2.5 ± 1 dB 0.0 -0.125 0.000 0.750 0.750 1.000
P3 0.0 -2.5 ± 1 dB 0.000 -0.125 1.000 0.750 0.750
P2 0.0 -4.4 ± 1.5 dB 0.000 -0.200 1.000 0.600 0.600
P10 0.0 See note (2) 0.000 See note (2) 1.000 See note (2) See note (2)
(1) Reduced swing signaling must implement presets #4, #1, #9, #5, #6 and #3. Full swing signaling must implement all of the above presets.
(2) P10 boost limits are not fixed, since its de-emphasis level is a function of the LF level that the Tx advertises during training. This approach permits both full and reduced swing transmitters to use P10 for testing to their respective boost limits.
Table 2-5 Vmargin for Different Swing Modes
Full-Swing Mode Reduced Swing Mode
000 No margining (FS) 61% FS
001 87% of FS 53% of FS
010 76% of FS 44% of FS
011 63% of FS 39% of FS
100 50% of FS 31% of FS
101 37% of FS 22% of FS
110 26% of FS 14% of FS