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Lecture 6 Combinational Components

Lecture 6 Combinational Components. CSCE 211 Digital Design. Topics Website; Xilinx schematic capture video Lab 1: wiring test Combinational Circuits Decoders Multiplexers Readings 5.4, 5.7. September 11, 2003. Overview. Last Time Lab 1 New Combinational Circuits / Components

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Lecture 6 Combinational Components

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  1. Lecture 6Combinational Components CSCE 211 Digital Design • Topics • Website; Xilinx schematic capture video • Lab 1: wiring test • Combinational Circuits • Decoders • Multiplexers • Readings 5.4, 5.7 September 11, 2003

  2. Overview • Last Time • Lab 1 • New • Combinational Circuits / Components • Decoders • 4x16 from 2x4 decoders • Multiplexers • VHDL –

  3. BreadBoard

  4. Wiring an LED • To wire an led • Hook the positive to Vcc • Hook the negative to a 330 ohm resistor • Hook the resistor to Gnd • Check for loose wires • Check for shorts - +

  5. 74LS00 – Quad 2 input NAND

  6. 74LS04 Hex Inverter

  7. Two Bit adder • How many inputs? • How many outputs? • Do we have enough chips?

  8. Karnaugh Map Simplification • F(W,X,Y,Z) = X WX 00 01 11 10 YZ 00 01 11 10 Z Y W

  9. Karnaugh Map Simplification • F(W,X,Y,Z) = X WX 00 01 11 10 YZ 00 01 11 10 Z Y W

  10. Karnaugh Map Simplification • F(W,X,Y,Z) = X WX 00 01 11 10 YZ 00 01 11 10 Z Y W

  11. Combinational Circuits • A combinational circuit is one that • The outputs are functions strictly of the inputs • There are no feedback loops

  12. Decoders

  13. 3x8 Decoder

  14. 4x16 decoder from 2x4s

  15. Multiplexers • A multiplexer selects one of its inputs to route to its outputs.

  16. Comb

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