EE 1001 Digital Topics Introduction to Electrical Engineering

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Presentation transcript:

EE 1001 Digital Topics Introduction to Electrical Engineering Dr. Chris Carroll MWAH 252 726-7530 ccarroll

Digital Logic Foundation for digital computer design Basics are easy. . . Discrete, two-valued variables Finite number of possible functions Complex operations built from easy basics Combinational circuits (no memory) Sequential circuits (memory)

Combinational Circuits AND gate OR gate NOT gate Inputs X Y Z Combinational Circuit Output (function of what X, Y, and Z are right now)

Sequential Circuits Flip-flops capture “state” of the circuit D Q clock Inputs X Y Z Sequential Circuit Output (function of what X, Y, and Z are right now and the recent history of their values.

Switch Networks You are supplied with an unlimited number of two different kinds of switches Ends connected Ends connected if X = 1 if X = 0 X X

Example Switch Networks Source of 1’s Source of 1’s Source of 0’s Source of 0’s A Network of Switches Function Not A A

AND/OR Switch Networks Source of 1’s Source of 1’s Source of 0’s Source of 0’s Network of Switches Network of Switches A AND B =1 if A=B=1 else =0 A OR B =0 if A=B=0 else =1

AND/OR Switch Networks Source of 1’s Source of 1’s Source of 0’s Source of 0’s A A B B A AND B A OR B A A B B

Complex Switch Network Source of 1’s Source of 0’s Network of Switches 1 if A=0 or if A=B=C=1, else 0

Surprising Switch Network Source of 1’s Source of 0’s B A C 1 if A=0 or if A=B=C=1, else 0 A B C

Computer Architecture How to build a computer Many philosophies Complex Instruction Set Computer (CISC) Reduced Instruction Set Computer (RISC) Always three parts of any computer Central Processing Unit (CPU) Memory (for both program and data) Input/Output (I/O)

Summary Digital is everywhere! Even analog things can be digitized Complexity is manageable High performance, low cost