EE40 Lecture 15 - Digital Love

# EE40 Lecture 15 - Digital Love - EE40 Lecture 15 Digital...

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EE40 Lecture 15 - Digital Love Neel Shah 7/29/11

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Class Grading rebalance HW 25%, Lab 25%, MT1 15%, MT2 15%, Final 20% Final Exam 8/12 Will be open book and open notes And about the same or less difficulty Can’t ask more crazy questions – not my area But it will be comprehensive… Curve will adjust to maintain the grade spread bSpace curve function also sucks Midterm 2 to come back next Wed
Class Reading assignments / practice problems Submit them to me by 8/10 for credit iClicker database wiped Submit your serial # on HW5 and/or HW6 Extra credit applied on top of curve Net average will remain at B So maybe it’s not applied on top of curve? I dunno, you tell me Guest lecture this Friday, 8/5, 12-2 pm

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Last time… We covered the basics of binary math Addition: A + B Multiplication: A * B Inversion: !A or ~A And their logical counterparts “OR” F A B “NOT” F A “AND” F A B
Last time… We covered the concept of “static discipline” The whole circuit obeys a contract to provide output voltages at two discrete levels If our circuit runs on a 5 VDC supply, then these two levels might be 0 V and 5 V They might wiggle a little but that is okay We can relate these levels to 0’s and 1’s for binary operations

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Logical Operations We know the basic operators AND/OR/NOT There is one other curiosity to explore… Q = AB + AB A B Q 0 0 0 0 1 1 1 0 1 1 1 0 This is called an XOR gate Only one of A or B is true! This is an “exclusive” OR = A B
Logical Operations All these logical operations can be inverted: NAND, NOR, XNOR NOT(NOT) = buffer / follower

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Logical Operations DeMorgan’s Laws allow you to recast NAND and NOR operations There are some simpler tricks too, like… And then there’s this one, which should help with…
Z = Shine bat signal C = Crime in progress B = Meet Batman

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EE40 Lecture 15 - Digital Love - EE40 Lecture 15 Digital...

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