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single-cycle cpu implementation

gimmy kaye
Greenhorn

Joined: Feb 27, 2012
Posts: 2
Hi all ,
On the textbooks I 've got I always read that
implementig a single cycle cpu requires two memories
one for data and one for instructions.

why this happens ?

Using a single memory with two read ports (see figure below) wouldn't it be
possibile to fetch the instruction and read
the operand specified in it during the same cycle ?

http://imageshack.us/photo/my-images/195/readports.jpg/
 
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subject: single-cycle cpu implementation