How to use properly DDR3 calibration method of MPR and pre-defined value.

[takayuki_ishii]

Hello, 

I have one question about proper use of DDR calibration method, with MPR and with pre-defined value.

In Read Calibration and Read DQS Gating Calibration, it have 2 metho, with MPR and with pre-defined value.

In what case are you supposed to use each function?

  with MPR : one time after board designed to generate pre-defined value.

  with pre-designed value : In product, one time in DDR initialization on power up sequence.

Is it correct?

Best regards,

Ishii.

[art · Accepted solution]

Yes, your understanding is correct. The MPR method should be used once at the product bring-up stage to generate a pre-defined calibration value, that then should be used each time at power-on boot-up.

Have a great day,
Artur

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[takayuki_ishii]

Hello Artur

Thank you for your answer.

I will report it to my customer.

Best regards,

Ishii.