General > General Technical Chat
How to pronounce XOR...really?
MK14:
Rather than arguing about it, build it! ( 74LVC1G386 ).
(Or cheat and look at the datasheet for >2 input XOR gates)
Here is one (3 input XOR).
https://www.nexperia.com/products/analog-logic-ics/control-logic/gates/exclusive-or-gates/series/74LVC1G386.html
https://assets.nexperia.com/documents/data-sheet/74LVC1G386.pdf
The ANSWER (as regards a real life 3 input XOR gate) is, it is an **ODD/EVEN PARITY gate/device, not an ALL(but only 1)=1 gate/device (e.g. for valid/correct input of exactly/only one button pressed/selected, on all inputs).
** ODD or EVEN depends on if you use XOR or XNOR, and how you wire it up and interpret it.
JohnnyMalaria:
--- Quote from: 16bitanalogue on March 07, 2021, 02:44:29 am ---
--- Quote from: JohnnyMalaria on March 07, 2021, 01:03:58 am ---
--- Quote from: 16bitanalogue on March 07, 2021, 12:25:01 am ---2. any odd inputs are high - output is HIGH
--- End quote ---
Well, that's just modern bullshit. I assume you are referring to cascaded XOR gates used for parity.
The X means EXCLUSIVE. One, not none, not more than one - One. Whoever first applied the term in the parity cases symbolizes the steady erosion of precise use of terminology that I see rampant in papers published by younger scientists. I suspect the same is true in T, E and (I hope not) M.
How old is your prof? I'd wager <35.
--- End quote ---
You could walk through the binary arithmetic of a multi-input ZOR gate with examples of both interpretations, and even look up standard IEEE 91 - you know because this is an engineering forum.
Perhaps write an angry email to the creator of Logisim on why he allows for both interpretations.
Maybe write some Verilog code?
Or continue to rant and rave over "correct" language and pronunciations from your porch rocking chair because if those are different than your own then it means someone doesn't know electronics concepts.
The absurdity. :-DD
--- End quote ---
Logical functions aren't electronic concepts. You are confusing mathematical function with electronic implementation.
IEEE 91 provides a standard for drawing symbols. It doesn't dictate the mathematics though it is clear about the the function of the exclusive or operator.
I'm sorry you consider the need for accuracy as ranting. It's a little odd that you are lackadaisical yet bring a national standard to the table. The problem with standards is that you can have conflicting ones. What IEEE say, IEC may say differently.
By all means call your parity function a "zor", but write it as such to avoid confusion with xor.
Cubdriver:
--- Quote from: MK14 on March 07, 2021, 10:11:26 am ---Rather than arguing about it, build it! ( 74LVC1G386 ).
(Or cheat and look at the datasheet for >2 input XOR gates)
Here is one (3 input XOR).
https://www.nexperia.com/products/analog-logic-ics/control-logic/gates/exclusive-or-gates/series/74LVC1G386.html
https://assets.nexperia.com/documents/data-sheet/74LVC1G386.pdf
The ANSWER (as regards a real life 3 input XOR gate) is, it is an **ODD/EVEN PARITY gate/device, not an ALL(but only 1)=1 gate/device (e.g. for valid/correct input of exactly/only one button pressed/selected, on all inputs).
** ODD or EVEN depends on if you use XOR or XNOR, and how you wire it up and interpret it.
--- End quote ---
Nexperia did a nice job of making that truth table more difficult to read by using 'H' and 'L' rather than the more common (in my experience, anyway) '1' and '0', thus making the it appear to be filled with uniform square blocks as opposed to fat zeroes and skinny ones that are much easier to differentiate. Perhaps the uniformity appears more pleasing aesthetically to an artistic type, but it makes it a hell of a lot more difficult to quickly interpret the information the table is meant to convey.
-Pat
MK14:
--- Quote from: Cubdriver on March 07, 2021, 02:58:12 pm ---Nexperia did a nice job of making that truth table more difficult to read by using 'H' and 'L' rather than the more common (in my experience, anyway) '1' and '0', thus making the it appear to be filled with uniform square blocks as opposed to fat zeroes and skinny ones that are much easier to differentiate. Perhaps the uniformity appears more pleasing aesthetically to an artistic type, but it makes it a hell of a lot more difficult to quickly interpret the information the table is meant to convey.
-Pat
--- End quote ---
There is always the Texas Instruments version:
https://www.ti.com/lit/ds/symlink/sn74lvc1g386.pdf
But it also seems to use the H/L format.
rsjsouza:
H/L was ths standard used in the TI TTL databook, which was a very popular (if not the most popular) reference for logic gates.
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