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04_combinationaldesign

# 04_combinationaldesign - Combinational Logic Design Process...

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84 Combinational Logic Design Process 1. Understand the Problem what is the circuit supposed to do? write down inputs (data, control) and outputs draw block diagram or other picture 2. Formulate the Problem in terms of a truth table or other suitable design representation truth table, Boolean algebra, etc. 3. Choose Implementation Target 4. Follow Implementation Procedure K-maps, Boolean algebra 85 Process Line Control Example Statement of the Problem Rods of varying length (+/-10%) travel on conveyor belt Mechanical arm pushes rods within spec (+/-5%) to one side Second arm pushes rods too long to other side Rods too short stay on belt 3 light barriers (light source + photocell) as sensors Design combinational logic to activate the arms Understanding the Problem Inputs are three sensors, outputs are two arm control signals Assume sensor reads "1" when tripped, "0" otherwise Call sensors A, B, C Draw a picture!

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86 Process Line Control Example (cont.) Where to place the light sensors A, B, and C to distinguish among the three cases?
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04_combinationaldesign - Combinational Logic Design Process...

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