PPT Slide

7 – Sequential Logic Examples

© 1996 Gaetano Borriello

Digital combination lock (equations for intermediate signals)

49

equal = (equal1 & equal2);

code1 = (mux2 & C2_1

# mux1 & C1_1

# mux3 & C3_1);

code2 = (mux2 & C2_2

# mux1 & C1_2

# mux3 & C3_2);

code3 = (mux2 & C2_3

# mux1 & C1_3

# mux3 & C3_3);

code4 = (mux2 & C2_4

# mux1 & C1_4

# mux3 & C3_4);

equal1 = (!code1 & !value1 & !code2 & !value2

# code1 & value1 & !code2 & !value2

# !code1 & !value1 & code2 & value2

# code1 & value1 & code2 & value2);

equal2 = (!code3 & !value3 & !code4 & !value4

# code3 & value3 & !code4 & !value4

# !code3 & !value3 & code4 & value4

# code3 & value3 & code4 & value4);

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