LRDIMM MWD Cycle Training - 1.0 English

Versal Adaptive SoC Programmable Network on Chip and Integrated Memory Controller 1.0 LogiCORE IP Product Guide (PG313)

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1.0 English
This training finds the correct cycle to maintain the set Write Latency value in the DRAM. In this training mode, the controller pre-programs the data buffer MPR registers with the expected pattern, issues write commands to load the data into memory, and issues reads to the memory. The data buffer compares the read data with the expected data and feeds back the result on to the DQ bus. Calibration identifies the correct cycle based on the result of the comparison.
Table 1. MWD Cycle Training Register
Register Name Quantity Description
Fx_DB_DWL_MWD_LAT Rank Data Buffer to DRAM latency [8:6] and Data Buffer phase [5:0]