SDAA515 August   2026 TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Detailed Description
    1. 2.1  DDR Inline ECC Overview
      1. 2.1.1 Benefits of DDR Inline ECC
    2. 2.2  ECC Protection Region Planning
    3. 2.3  ECC Capacity Considerations
    4. 2.4  ECC Configuration Guidelines
      1. 2.4.1 ECC Generation Phase
      2. 2.4.2 ECC Protection Phase
    5. 2.5  Why DDR Priming Is Required
    6. 2.6  DDR Priming Using DRU
    7. 2.7  DRU Resource Allocation
    8. 2.8  SBL Integration
    9. 2.9  Recommended Initialization Flow
    10. 2.10 Performance Evaluation
    11. 2.11 Troubleshooting Common DDR Inline ECC Deployment Issues
      1. 2.11.1 ECC Checking Enabled Before Priming
      2. 2.11.2 Incorrect ECC Region Configuration
      3. 2.11.3 Read-Modify-Write Disabled
    12. 2.12 Validation and Debug Considerations
  6. 3Summary
  7. 4References

2.11.3 Read-Modify-Write Disabled

Symptoms:

  • ECC mismatches following partial writes
  • Intermittent ECC faults

Root cause:

  • ECC information is not regenerated correctly for sub-word write operations

Solution:

  • Verify RMW functionality remains enabled whenever DDR Inline ECC is enabled