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For 32-Mbit RAM pin out we will provide the ADDR(20) on pin 54 in the 54 pin TSOP II package and the HSB# will be sacrificed.
If we were to do a 64M (4M x16), the extra address (A21) would be on pin 1.
The ADDR(22-26) will be assigned to next set of NC pins like 26, 27, 28, 29.
I hope this answers your query.
Thanks and Regards,