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AM3352: Risk for pull up resistor on DDR3 reset signal

gao gao
Prodigy 10 points
Part Number: AM3352

Tool/software:

I need TI hardware team to tell me if there is a risk of adding a 10K Ω pull-up resistor to the reset pin of the AM3352 DDR3 chip, and if it may cause the device to fail to power on? I added a pull-up resistor to this signal in my design, but ISSI FAE requested to remove this resistor and add a 4.7K Ω pull-down resistor.
I would like to know if there are any risks associated with my design, such as the possibility of DDR initialization failure or inability to boot up?

Best regards

  • 0
    TI__Guru* 86180 points

    Yes, technically there should be a pull down to keep the reset signal low during power ramp.  In practice, i have never seen an issue during power up, because eventually, the DDR controller will drive the RESET signal low to generate the proper power up sequence that the memory expects.  This will be part of the initialization sequence performed by the DDR driver.

    Regards,

    James