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WinCupl- using Shift register n multiplexer

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jude00

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Name mux ;
PartNo 00 ;
Date 11/04/2011 ;
Revision 01 ;
Designer Engineer ;
Company University of Tulsa ;
Assembly None ;
Location ;
Device V2500C ;

/* *************** INPUT PINS *********************/
PIN 1=clk ; /* */
PIN 3=x ; /* */
PIN 4=r1 ; /* */
PIN 5=r2 ; /* */
PIN 6=r3 ; /* */
PIN 7=r4 ; /* */

/* *************** OUTPUT PINS *********************/
PIN 9=z ; /* */
PIN 12=q0 ; /* */
PIN 13=q1 ; /* */
PIN 14=q2 ; /* */
PIN 15=q3 ; /* */
PIN 16=q4 ; /* */
PIN 24=q5 ; /* */
PIN 25=q6 ; /* */
PIN 26=q7 ; /* */



/*mux*/
z=!q6&!q7&r1 # !q6&q7&r2 # q6&!q7&r3 # q6&q7&r4;

/*shift Register */
q0.d=x;
q1.d=q0;
q2.d=q1;
q3.d=q2;
q4.d=q3;
q5.d=q4;
q6.d=q5;
q7.d=q6;

on my program when i change q6 and q7 i only get the vlaues of R1 on my out put Z, can any one please help me with it ????
 
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