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What's the use of a12 line when interfacing AT91RM9200?

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suryanarayana

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while interfacing at91rm9200 with MT48LC16M16A2TG OR MT48LC16M16A2TP SDRAM IC ,the adressing lines a(0:9) are connected to a(2:11) of controller. and
a(11:12) to a(13:14). a10 is for precharge.why was the a12 left ? what is the use of a12 of the controller?
 

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a10/precharge line from ARM eill simulate A12
 
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