The status of Write Per-Bit DBI Deskew can also be determined by decoding the CAL_ERROR result according to the table below. Execute the Tcl commands noted in the Manually Analyzing the XSDB Output section to generate the XSDB output containing the signal results.
| Error Code | Description | Recommended Debug Step |
|---|---|---|
| 24 | No valid data found for a given bit in the byte by incrementing DQS ODELAY first and then DBI ODELAY. | Check the alignment of DQS to DBI during a write burst with a scope on the PCB. Check the DQS-to-CK alignment. Check the WRLVL fields in XSDB for a given byte. |
| 25 | Noise region not found for a given bit in the byte by incrementing DBI ODELAY using step size of 10 taps. | Check for a mapping issue. This usually implies a delay is not moving when it should. Check the connections going to the XPHY and ensure the correct RIU is selected based on the byte being adjusted. |
| 26 | Noise region not found for a given bit in the byte by incrementing DBI ODELAY using step size of 1 tap. | Check for a mapping issue. This usually implies a delay is not moving when it should. Check the connections going to the XPHY and ensure the correct RIU is selected based on the byte being adjusted. |