SDAA325 August   2026 DRA821U , DRA821U-Q1 , TDA4AEN-Q1 , TDA4VEN-Q1 , TDA4VH-Q1 , TDA4VL-Q1 , TDA4VM , TDA4VM-Q1 , TDA4VP-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 OSPI/QSPI Flash Devices Used on TDA4x EVMs
  6. 3 OSPI Flash Selection Considerations for Custom Boards
  7. 4 OSPI Access Modes
    1. 4.1 Direct Access (DAC)
    2. 4.2 Indirect Access (INDAC)
    3. 4.3 Software Triggered Instruction (STIG)
    4. 4.4 Execute-In-Place (XIP)
    5. 4.5 Recommended OSPI Access Modes
  8. 5 OSPI Clock Frequency Support
  9. 6 OSPI Flashing and Boot Support
  10. 7 OSPI Migration and Required Updates
  11. 8 Verifying OSPI Configuration Using SDK Driver Examples
  12. 9 Common OSPI Issues on TDA4x Devices
    1. 9.1 DAC Addressing Limitation
    2. 9.2 PHY Tuning Issue
  13. 10QSPI Boot Support Considerations
  14. 11Summary
  15. 12References

4.1 Direct Access (DAC)

Direct Access (DAC) mode provides a memory-mapped interface to the external flash. In this mode, read accesses are automatically triggered when the processor accesses the mapped address space.

This mode is commonly used for:

  • High-performance read operations
  • Execute-In-Place (XIP)
  • Code execution directly from external flash

In DAC mode, the flash memory appears in the system memory map.