CAL_ERROR Decode for Write DQS to DQ/DBI Centering Calibration

CAL_ERROR Decode for Write DQS to DQ/DBI Centering Calibration - 1.0 English

Versal Adaptive SoC Soft DDR4 SDRAM Memory Controller LogiCORE IP Product Guide (PG353)

Document ID

PG353

Release Date

2023-10-18

Version

1.0 English

The status of Write DQS to DQ/DBI Centering 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

Table 1. CAL_ERROR Decode for Write DQS to DQ/DBI Centering Calibration
Error Code	Description	Recommended Debug Step
27	Right edge of write data not found by incrementing DQS 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.
28	Right edge of write data not found by incrementing DQS 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.
29	Positive sanity check failed.	Check CAL_ERROR_BIT__, CAL_ERROR_DATA_NIBBLE__, CAL_ERROR_PHY_NIBBLE__ XSDB registers to determine which nibbles/bits failed. Check margin found during previous stages of calibration for the given byte that failed.