CAL_ERROR Decode for Write Latency Calibration

CAL_ERROR Decode for Write Latency 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 Latency Calibration 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 Latency Calibration
Error Code	Description	Recommended Debug Step
37	Could not find the data pattern given the amount of movement available.
38	Write Latency found rank to rank skew greater than expected. Check margin for the byte for earlier stages of calibration. Probe the DQS/DQ signals (and DM if applicable).	Check DQS and CK trace lengths for all the ranks. Ensure the maximum trace length is not violated. For debug purposes, try a lower frequency.
39	Positive sanity check failed.	Check read data margins from earlier stages of calibration. Check signal integrity during reads on the DQS and DQ.