address decoders

Azuma Hashimoto (azuma_h@hotmail.com) Thu, 07 Dec 2000 11:37:56 -0800 

From: "Azuma Hashimoto" <azuma_h@hotmail.com>
Subject: address decoders
Date: Thu, 07 Dec 2000 11:37:56 -0800



Hi.  I have a question about exercise 7 from the microcomputer architecture 
handout.  In it we are supposed to draw out a diagram for a microcomputer.  
But when you did it in class the address decoder only gets an 18 bit 
address?
Why is that?  Is it because the I/O chip could always potentially be active 
with any other activity?  So that when you have the EPROM and I/O active at 
the same time the address decoder needs
16(for EPROM) + 2(for I/O) = 18 bits?????
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