SNAA386 November   2023 CDCE6214 , CDCE6214-Q1 , CDCE6214Q1TM , LMK00301 , LMK00304 , LMK00306 , LMK00308 , LMK00334 , LMK00334-Q1 , LMK00338 , LMK03318 , LMK03328 , LMK3H0102 , LMK6C , LMK6H , LMKDB1108 , LMKDB1120

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Introduction to PCIe
    1. 2.1 The PCIe Link
  6. 3PCIe Clocking Architectures
    1. 3.1 Common Clock Architecture
    2. 3.2 Separate Reference Architecture
    3. 3.3 Spread Spectrum Clocking
    4. 3.4 PCIe REFCLK Topology
    5. 3.5 Noise Folding
  7. 4PCIe Clocking Specifications
    1. 4.1 REFCLK Output Format
    2. 4.2 PCIe Jitter Requirements
    3. 4.3 PCIe Time Domain Requirements
  8. 5REFCLK Measurement Technique
    1. 5.1 Clock Generator Measurement Results
      1. 5.1.1 PNA Measurement Result without SSC
      2. 5.1.2 PCIe Filtered PNA Result without SSC
      3. 5.1.3 PNA Measurement Result, With SSC
      4. 5.1.4 PCIe Filtered PNA Result, With SSC
      5. 5.1.5 Time Domain PCIe Measurement Result
    2. 5.2 Clock Buffer Measurement Results
      1. 5.2.1 PNA Measurement Result
      2. 5.2.2 PCIe Filtered PNA Result
      3. 5.2.3 Time Domain PCIe Measurement Result
  9. 6Texas Instruments Products with PCIe Compliance
  10. 7Summary
  11. 8References

5.1.4 PCIe Filtered PNA Result, With SSC

Table 5-3 shows the result of the SSC PNA capture after post processing using the PCIe Gen 6.0 filters. With the addition of SSC, each of the filter combinations continue to pass the PCIe Gen 6.0 limit of 100 fs of RMS jitter.

Table 5-3 LMK3H0102 Detailed PCIe Gen 6 Measurements, With SSC
PCIe Gen Clock Architecture Noise Fold Filter Combination PLL1 f1 PLL1 ζ1 PLL2 f2 PLL2 ζ2 CDR f3 Jitter (fs) Limit (fs) Status
6 CCS 3 1 5.000e+5 14.0 5.000e+5 14.0 1.000e+7 10.825 100.0 PASS
6 CCS 3 2 5.000e+5 14.0 5.000e+5 0.73 1.000e+7 12.809 100.0 PASS
6 CCS 3 3 5.000e+5 14.0 1.000e+6 14.0 1.000e+7 19.740 100.0 PASS
6 CCS 3 4 5.000e+5 14.0 1.000e+6 0.73 1.000e+7 17.380 100.0 PASS
6 CCS 3 5 5.000e+5 0.73 5.000e+5 14.0 1.000e+7 12.809 100.0 PASS
6 CCS 3 6 5.000e+5 0.73 5.000e+5 0.73 1.000e+7 7.595 100.0 PASS
6 CCS 3 7 5.000e+5 0.73 1.000e+6 14.0 1.000e+7 22.194 100.0 PASS
6 CCS 3 8 5.000e+5 0.73 1.000e+6 0.73 1.000e+7 18.944 100.0 PASS
6 CCS 3 9 1.000e+6 14.0 5.000e+5 14.0 1.000e+7 19.740 100.0 PASS
6 CCS 3 10 1.000e+6 14.0 5.000e+5 0.73 1.000e+7 22.194 100.0 PASS
6 CCS 3 11 1.000e+6 14.0 1.000e+6 14.0 1.000e+7 21.601 100.0 PASS
6 CCS 3 12 1.000e+6 14.0 1.000e+6 0.73 1.000e+7 20.718 100.0 PASS
6 CCS 3 13 1.000e+6 0.73 5.000e+5 14.0 1.000e+7 17.380 100.0 PASS
6 CCS 3 14 1.000e+6 0.73 5.000e+5 0.73 1.000e+7 18.944 100.0 PASS
6 CCS 3 15 1.000e+6 0.73 1.000e+6 14.0 1.000e+7 20.718 100.0 PASS
6 CCS 3 16 1.000e+6 0.73 1.000e+6 0.73 1.000e+7 15.170 100.0 PASS