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DDR2 OCD calibration problem
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hello_asic



Joined: 22 Sep 2009
Posts: 1
Location: China
Post26 Oct 2009 14:08   

DDR2 OCD calibration problem
In OCD Calibration mode, DDR Controller must compare the voltage of DQ,DQS/DQSN which DDR2 SDRAM output.
I don't know how can I compare the DQ,DQS/DQSN voltage is all right??

Are we just need to compare the high level('1') or low level('0') of the DQ,DQS/DQSN pin?

Is anybody know how to do OCD Calibration of DDR2,especially the adjust mode of OCD. Thank you very much.
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