SPRADK1 September   2025 AM620-Q1 , AM623 , AM625 , AM625-Q1 , AM625SIP , AM62A1-Q1 , AM62A3 , AM62A3-Q1 , AM62A7 , AM62A7-Q1 , AM62L , AM62P , AM62P-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Spread-Spectrum Clocking
    1. 1.1 SSC Modulation Rate
    2. 1.2 SSC Modulation Depth
    3. 1.3 SSC Spread Type
    4. 1.4 SSC Modulation Profile
  5. 2PLL SSC Implementation Details
    1. 2.1 PLL SSC Configuration Registers
    2. 2.2 PLL SSC Implementation Sequence With DSS PLL17 on AM62Px
  6. 3SSC Conclusion and Considerations

1.3 SSC Spread Type

The clock frequency variation can be affected only on the negative side (lower frequency) or on both positive side (higher frequency) and negative side. When varied equally on both sides, the spread type is referred as centered. When varied on the negative side only, the spread type is referred to as down spread.

The AM62x, AM62Ax, AM62Px, and AM62Lx SoCs support both center and down spread.

CAUTION:

Use center spread with caution because center spread increases the highest frequency of the interface above the nominal value. Care must be taken so that the interface is designed to handle this slightly higher frequency. Conversely, down spread results in an average frequency that is less than the nominal frequency.