CAL_ERROR Decode for Write Per-Bit DQ Deskew Calibration

CAL_ERROR Decode for Write Per-Bit DQ Deskew 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 Per-Bit DQ 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.

Table 1. CAL_ERROR Decode for Write Per-Bit DQ Deskew Calibration
Error Code	Description	Recommended Debug Step
21	No valid data found for a given bit in the byte by incrementing DQS ODELAY first and then DQ ODELAY.	Check the alignment of DQS to DQ 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.
22	Noise region not found for a given bit in the byte by incrementing DQ 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.
23	Noise region not found for a given bit in the byte by incrementing DQ 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.