Design a 2-bit countdown counter using D flip-flops and binary coding. This circuit has an input X. When X=0 flip-flops preserve their states. When X=1 next state is 1 less than the previous state. e.g. When X=1 if present state is 11 then the next state should be 10.

Electric Motor Control
10th Edition
ISBN:9781133702818
Author:Herman
Publisher:Herman
Chapter22: Sequence Control
Section: Chapter Questions
Problem 6SQ: Draw a symbol for a solid-state logic element AND.
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Design a 2-bit countdown counter using D flip-flops and binary coding.

  • This circuit has an input X.
  • When X=0 flip-flops preserve their states.
  • When X=1 next state is 1 less than the previous state. e.g. When X=1 if present state is 11 then the next state should be 10.
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