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3_组合逻辑设è®&iexcl

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1 Outline • Analyze the Logic Circuits • Synthesis using Logic Gates • Hazards & Glitches • Logic Design using MSI • Logic Design using PLD (talk about later)
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2 How to Analyze • Logic Circuits • Finding the Boolean functions from inputs to outputs • Truth/Function Table • Analyze to tell the function
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3 Analyzing the logic circuit D C B A Y 2 Y 1 Y 0 Y 2 =((DBA)’(DC)’)’ =((DBA)’)’+((DC)’)’ =DBA+DC Y 1 =((DC’A’)’(DC’B’)’ (D’CB)’)’ =DC’A’+DC’B’ +D’CB Y 0 =((D’B’)’(D’C’)’)’ =D’B’+D’C’
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4 Truth Table 0 0 1 1 1 1 1 0 1 0 1 1 1 0 0 0 1 0 1 1 1 0 1 0 0 1 1 0 0 0 1 1 0 1 1 1 0 0 1 0 1 0 0 0 1 0 0 1 1 1 0 0 0 0 1 0 0 0 1 1 1 0 1 1 0 0 1 1 0 0 0 1 0 0 1 0 1 1 0 0 0 1 0 0 0 1 0 1 0 0 1 1 0 0 1 0 0 0 0 1 0 0 0 0 1 1 0 0 0 0 0 0 Y 0 Y 1 Y 2 A B C D Y 0 Y 1 Y 2 A B C D
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5 Synthesis Procedure • Definition Logically • Truth Table • Simplification • Logic Functions • Logic Circuits
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6 Definition Logically • Compare Two 2-bit Numbers • Inputs: A 1 A 0 and B 1 B 0 • Outputs: LT(A<B), EQ(A=B), GT(A>B) • Next Step: Truth Table
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7 Comparators(1) A A 1 A 0 B 1 B 0 LT EQ GT Block Diagram
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This note was uploaded on 03/28/2011 for the course EE 30230563 taught by Professor Rongluo during the Spring '09 term at Tsinghua University.

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