# Lecture-03 - EEE 333 VHDL L-03 CMOS Digital Logic Fall 2009...

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EEE 333: VHDL, L-03 Fall 2009, ASU David R. Allee, [email protected] , GWC 234 CMOS Digital Logic

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EEE 333, ASU, D.Allee Lecture 03 - 2 - Highlight Boolean algebra Elementary Boolean gates Combinational logic Boolean logic with CMOS Elementary CMOS gates: INV, NAND, NOR More complicated gates: MUX, XOR, etc. Construction of logic path and units Reading: Chapter 2 in Wolf’s book A good place to practice your Boolean logic: http://educ.queensu.ca/~compsci/resources/BoolLogic/ass
EEE 333, ASU, D.Allee Lecture 03 - 3 - What Are We Doing Here? This class is about “hardware description languages” and implementing digital designs in FPGAs Much of the class is about learning VHDL, which looks like a programming language However, it is important to remember that the goal is to build digital hardware In general it helps to remember (always) that you’re building hardware The important implications are Your code must be synthesizable to be of value You have to think a lot about the timing of events So we’ll start with a quick review of digital logic basics

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EEE 333, ASU, D.Allee Lecture 03 - 4 - A CMOS Inverter The simplest logic unit of digital circuits V in V out C L V DD 0 1 1 0 Out In V in V out C L V in V in
EEE 333, ASU, D.Allee Lecture 03 - 5 - Dynamic Logic Operations V in V out C L (a) Low-to-high V out R p V DD C L (b) High-to-low In Out 0 1 1 0 V out R n V DD C L

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EEE 333, ASU, D.Allee Lecture 03 - 6 - Highlight Boolean algebra Elementary Boolean gates Combinational logic Boolean logic with CMOS Elementary CMOS gates: INV, NAND, NOR More complicated gates: MUX, XOR, etc. Construction of logic path and units Reading: Chapter 2 in Wolf’s book A good place to practice your Boolean logic: http://educ.queensu.ca/~compsci/resources/BoolLogi c/assocdistrib.html
EEE 333, ASU, D.Allee Lecture 03 - 7 - Digital Electronics Digital is an approximation to the analog nature Example: digital sound is encoded as 44.1 kHz, 16 bit audio

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