Combinational Logic Discussion D2.5. Combinational Logic Combinational Logic inputsoutputs Outputs depend only on the current inputs.

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Presentation transcript:

Combinational Logic Discussion D2.5

Combinational Logic Combinational Logic inputsoutputs Outputs depend only on the current inputs

Sample Combinational Circuit

From circuit to truth table

From truth table to circuit

No reduction With reduction abcxy Using K-maps to reduce Direct implementation

2-variable 3-variable 4-variable Recall… Karnaugh Maps for logic reduction

Ummmm, NO. Let the software minimize for you…

BCD 7-Segment Decoder

BCD 7-Segment Decoder – K-map for ‘a’

BCD 7-Segment Decoder All signals: a, b, c, d, e, f, g

Structural VHDL for the BCD to 7-seg Decoder

DECLARING THE COMPONENTS THAT YOU WILL USE

Structural VHDL for the BCD to 7-seg Decoder WIRE IT UP

Structural VHDL for the BCD to 7-seg Decoder OR… AN EASIER WAY USING GATES FROM THE 1164 STANDARD LIBRARY (STILL STRUCTURAL)

Structural VHDL for the BCD to 7-seg Decoder OR… EVEN EASIER YET A BEHAVIORAL DESCRIPTION