The Difference between QDRII(or QDR2) and QDRII+ (or QDR2+ )

Question: 1) What is the difference between QDR II(or QDR2) and QDR II+(or QDR2+) ?  2) Can QDR II+(or QDR2+) replace QDR II(or QDR2) ?

 

Answer:

The differences between QDRII(or QDR2) and QDRII+(QDR2+) are listed in the attached Presentation. The QDR-II and QDR-II+ are pin compatible except that QDR-II has C/C# signal and no QVLD signal; while QDR-II+ has QVLD signal and not C/C# signal.