# chap14 - ECEn/CS 224 Chapter 14 Homework Solutions 14.1...

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Last updated: 10/27/2006 ECEn/CS 224 Chapter 14 Homework Solutions 14.1 Design a 2-bit gray code counter with a CLR input and a INC input. In the case CLR = INC = ‘1’, have the counter also increment. CLR INC Q 1 Q 0 N 1 N 0 0 0 0 0 0 0 0 0 0 1 0 1 0 0 1 0 1 0 0 0 1 1 1 1 0 1 0 0 0 1 0 1 0 1 1 1 0 1 1 0 0 0 0 1 1 1 1 0 1 0 0 0 0 0 1 0 0 1 0 0 1 0 1 0 0 0 1 0 1 1 0 0 1 1 0 0 0 1 1 1 0 1 1 1 1 1 1 0 0 0 1 1 1 1 1 0 N 1 = INC•Q 0 + CLR’•INC’•Q 1 N 0 = INC•Q 1 ’ + CLR’•INC’•Q 0 CLR INC Q 1 Q 0 00 01 11 10 00 N 1 01 1 1 11 1 1 1 10 1 CLR INC Q 1 Q 0 00 01 11 10 00 1 1 N 0 01 1 1 1 11 1 10 D Q D Q Q 0 Q 1 Q 1 INC CLR Q 0 Q 1 Q 0 N 1 N 0 INC INC CLR INC CLK CLK

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Last updated: 10/27/2006 14.2 Modify the transition table for the counter in the previous problem to contain a static output. This output (call it Z ) should be asserted any time the current counter value is not equal to ‘00’. Finally, write the equation for Z . CLR
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chap14 - ECEn/CS 224 Chapter 14 Homework Solutions 14.1...

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