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66AK2G12: DDR ADDRESS bit

Part Number: 66AK2G12

Hello 

In DDR  soc block has an address width of A[15:0], but my DDR chip has an address width of A[13:0]
i will be interfacing addressA[13:0] lines of DDR chip to soc ddr blockA[13:0]
what should  do with the soc address lines A[15:14], should I leave it floating,pull high,pull low or should I terminate it along with the remaining address group

Babu