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AM3352: DDR schematic questions

Denny%20Yang99373
Expert 3805 points
Part Number: AM3352


Hi all,

Customer have questions about am3352 schematic, could please help this? thanks!

1, What's the purpose of terminal resistor of DDR clk like below?

2, What's the purpose of the capacity between VTT and 1.5V?

thanks!

BR,
Denny

  • 0
    TI__Guru**** 393215 points
    Hi,

    1. Where did you get this schematic form? This is incorrect. RZ75 must be deleted. The RC termination to 1.5V is required.
    2. These are HF decoupling capacitors for Vtt. Again, termination resistor values are wrong. They must be 50Ohm.

    Please tell your customer to follow the DDR design guidelines, as given in section 7.7.2.3 of the AM335x Datasheet Rev. J. The information in the datasheet supercedes any reference designs available.