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Unformatted text preview: ECE 270 Introduction to Digital System Design Fall 2011 TakeHomaWork for Module 6 Due Monday, November 28 1. [10 points] To implement transfer-of-control instructions in the simple computer requires modification of the program counter. Briefly describe the modification that is necessary: Complete the ABEL file below that implements the modified program counter: MODULE pcwl TITLE 'Program Counter with Load Capability' DECLARATIONS CLOCK pin; PC0..PC4 pin istype 'reg_D,buffer'; PCC pin; " PC count enable ARS pin; " asynchronous reset (connected to START) POA pin; " PC output on address bus tri-state enable PLA pin; " PC load from address bus enable " Note: Assume PCC and PLA are mutually exclusive EQUATIONS " retain state load count up by 1 PC0.d = !PCC&!PLA&PC0.q # ___________ # PCC&!PC0.q; PC1.d = !PCC&!PLA&PC1.q # ___________ # PCC&(PC1.q$PC0.q); PC2.d = !PCC&!PLA&PC2.q # ___________ # PCC&(PC2.q$(PC1.q&PC0.q)); PC3.d = !PCC&!PLA&PC3.q # ___________ # PCC&(PC3.q$(PC2.q&PC1.q&PC0.q)); # PCC&(PC3....
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This note was uploaded on 02/12/2012 for the course ECE 270 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.
- Spring '08