Org4 - Digital Logic Ch. 4 and Appendix C Gates The most...

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    Digital Logic Ch. 4 and Appendix C
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    Gates The most obvious  gates are AND and  OR We can combine  them to implement  any logic function
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    Conventions Zero volts is logic-0 5 volt is logic-1 Unless we use negative logic Most computers use smaller voltages now 1.5 volt is used by DDR3 memories In this case 1.5 volt is logic-1 Dues to electrical noise the logic levels are  define by a range.
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    Other gates The little circle means  ”not” NOR gate (not-OR) NAND gate WHAT??? WHAT???
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    Truth Tables It is the opposite of an  AND gate It is a NAND gate
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    Example Try to figure out what  this does It is a one bit adder  with carry in.
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    Simpler Drawing
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    Programmable Logic Arrays PLA for short The dots are really fuses inside a chip Fuses can be programmed once Can implement any logic function
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This note was uploaded on 02/13/2012 for the course CSE 1720 taught by Professor Baljko during the Winter '12 term at York University.

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Org4 - Digital Logic Ch. 4 and Appendix C Gates The most...

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