QDR-II+ has additional signal that does not exist in QDR-II

Question: Does the QDR-II+ has any additional signal that does not exist in QDR-II?

 

Answer:

Yes, the QDR-II has one additional signal compare to the QDR-II, and it is the QVLD signal. The QDLD - Valid Output Indicator - signal indicates valid output data. QVLD is edge aligned with CQ and CQ#. For more details, please see the application note AN4065 - QDR™-II, QDR-II+, DDR-II, and DDR-II+ Design Guide