External Memory Interface Handbook Volume 2: Design Guidelines: For UniPHY-based Device Families

ID 683385
Date 3/06/2023
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10.7.1.2.3. Power System

Some memory interfaces draw current in spikes from their power delivery system as SDRAMs are based on capacitive memory cells.

Rows are read and refreshed one at a time, which causes dynamic currents that can stress any power distribution network (PDN). The various power rails should be checked either at or as close as possible to the SDRAM power pins. Ideally, you should use a real-time oscilloscope set to fast glitch triggering to check the power rails.