SDAA315 March   2026 AM2432 , AM625 , AM62A7 , AM62D-Q1 , AM62L , AM62P , AM6442

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Terminology
  6. 3 PHY Tuning Algorithm
  7. 4 Key Tuning Parameters
    1. 4.1 Parameter Configurations for Non-DQS PHY Tuning Algorithm
    2. 4.2 Parameter Configurations for DQS PHY Tuning Algorithm
  8. 5 Prerequisites for PHY Tuning Algorithm
    1. 5.1 Hardware Requirements
      1. 5.1.1 Flash Device Preparation
      2. 5.1.2 PHY Configuration
    2. 5.2 Attack Vector
    3. 5.3 Passing vs Failing Region
    4. 5.4 Master vs Bypass Mode
      1. 5.4.1 Bypass Mode
      2. 5.4.2 Master Mode
  9. 6 Need for a Newer Tuning Algorithm
    1. 6.1 Temperature Variations
  10. 7 Algorithm Implementation
    1. 7.1 DQS PHY Tuning Algorithm
      1. 7.1.1 Diagonal Selection
      2. 7.1.2 Valid Read Delays Selection
      3. 7.1.3 Corner Points Identification
        1. 7.1.3.1 Corner Point Selection for Only One Read Delay Value
        2. 7.1.3.2 Corner Point Selection for Two Different Read Delay Values
      4. 7.1.4 Tuning Point Selection
    2. 7.2 Non - DQS PHY Tuning Algorithm
      1. 7.2.1 Fix Tx DLL Value
      2. 7.2.2 Find Rx Window 1
      3. 7.2.3 Find Rx Window 2
      4. 7.2.4 Choose Larger Rx Window
      5. 7.2.5 Calculate the OTP
      6. 7.2.6 Temperature Consideration
  11. 8 Tuning Enhancements
    1. 8.1 Tuning Time Optimization – Skip Tuning Feature
    2. 8.2 Runtime Validation – Validate OTP
  12. 9 Summary
  13. 10References

8.1 Tuning Time Optimization – Skip Tuning Feature

MCU+ SDK 11.02 has a feature to skip PHY Tuning. This feature reduces boot time for later stages. For systems with multi-stage boot processes, tuning can be performed once in the first stage, such as in the primary bootloader, and reused in subsequent stages by performing the following steps:

  1. First boot stage performs the complete tuning and stores the parameter values in hardware registers.
  2. When Skip Tuning is enabled in SysConfig, subsequent stages retrieve the saved parameters for direct application by the driver.