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I am debugging the UniPHY External Memory Interface. The following message is displayed. What does this mean?
<message>
Initial failing calibration stage: Read Calibration - Guaranteed Read Failure
Read Calibration in the message corresponds to the read/write part when the DDR memory is initialized.
This state indicates that reading and writing during initial operation have failed.
For details of each stage, please refer to Page 7, "Figure 13–3. Debugging Tips" in the URL link below.
https://www.altera.com/en_US/pdfs/literature/hb/external-memory/emi_uniphy_ref_emif_toolkit.pdf
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