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Replace 54 pin memory with 66 pin memory? Will this possibly work?
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u666sa:
Task -- replace W9825G6JH 4 M x 4banks x 16 BITS SDRAM in 54 tsop2 with HY5DU121622CTP-D43 8M x 4banks x 16bits in 66 tsop2. 


Legend:
66 pin chip 54 pin chip


Possible questionable things:
1.. LDQS, UDQS situation. Not used?
2.. VREF. Should come on after VDDQ. What to do?
3.. LDM, UDM situation. Does connecting to LDQM and UDQM looks legit?
4.. /CK differential. Can it just be connected to CK?

Datasheets:
54 pin chip --  W9825G6JH.PDF (803.78 kB - downloaded 21 times.)
66 pin chip --  HYSCS02664-1.pdf (1623.9 kB - downloaded 22 times.)

What do you think?  :-//
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