|
In a -5 to 5 volt system, minus values are treated the same as positive. the 0 is in between 0 and 0.8 and the 1 is in between 2.5 volts and 5.
Panasonic developed three state chips which read 0.8 to 2.5 volts as a third value.
|
|
|
|
|
I always thought zero was 1070/2025 Hz and 1 was 1270/2225 Hz (that is up/down).
At least that is how 0 and 1 was represented when I learned my first BASIC programming. Oh well, that was way back in late 1975. Maybe newer implementations use different representations.
|
|
|
|
|
Every circuit has noise and dark current, both of which tend to increase with temperature. Whatever the circuit treats as a logic 0 or 1 is within a certain tolerance.
Marc
|
|
|
|
|
In a lot of chips I've worked with there is an internal threshold (sometimes external resistor) that if the voltage is above "X" it is on, if below it is off.
Serial ports work like this with either a 5vdc reference or a 2.5vdc reference and then is split down the middle. there is an effect called field magnetism (bleed)where other external voltages can influence (and will) the wire voltage so you never get a clean 0vdc. So chip manufactures tend to build this into the chips.
a signal could look like: 4.5, 1.2, 3.8, 0.6, (on,off,on,off) and still be perfectly valid, that's where oscilloscopes come in handy for troubleshooting. 
|
|
|
|
|
The reality is that all circuits are really analog, they don't instantly change from one state to another.
So, the transition is never at one extreme or the other. If the chip claims to work at say 0 and +5 there is some point before +5 that the circuit decides the signal is a 1 and some point before 0 that it decides that the signal is a 0 (replace 0 and +5 with your favorite voltages for representing 1 and 0.)
In diagrams they like to draw straight lines and sharp corners but the reality that none of the lines are straight and none of the corners or sharp. In fact, there is usually some amount of overshoot at the corners and a certain amount of settle time. They have a couple of pictures here of what overshoot looks like.
So, if they used the 0 or the +5 for the actual 1 and 0 indicator it would get very tricky because the signal (at least at the corners) tends to bound around the min and the max voltage...
|
|
|
|
|
Not sure what you mean by currency. You generally have voltage, current, and resistance.
As for 0 and 1, generally this is a measure of voltage only. And most of the time 0 is near ground potential and 1 is near Vcc (the voltage common to the circuit). So if your wondering if there might be some amount of residual voltage - yes. In fact it with a typical circuit, most of the time the pins will not be exactly or Vcc. They will be slightly higher than 0 or slightly lower then Vcc. And occasionally, you can actually et something that is very close to half way between, but such a situation is generally a result of some problem in the circuit.
Having said all this, in most cases in working with a digital circuit it helps to set the scale and simply lance at the value. High and low will be very obvious.
|
|
|
|
|
I saw a lot of good answers here, but wanted to point out that there are some very common devices in personal computer architecture that use multiple voltage levels to represent more data - MLC solid state devices, one example of which is the Triple Level Cell SSD from Samsung. These use 8 voltage levels to represent 8 bits of information per cell (as far as I remember). The details have gotten a little hazy, but this^] article explains it pretty well. In other words, 0 is only represented by the accepted range of the voltage present, as any other value would be.
|
|
|
|
|
Algerian Airlines this time....does anyone else think Nagy should fly to Hungary instead of taking the car? 
Seriously though is anyone going to fly in the next few days it would be squeaky bum time wouldn't it?
|
|
|
|
|
I would prefer to fly, but the cost for four with luggage and a hire car when we get there is stupidly expensive compared to the tunnel & 6 tanks of fuel.
The time saved is actually negligible, when you consider door to door is close to ten hours flying to get down to Fured.
|
|
|
|
|
Nagy Vilmos wrote: I would prefer to fly,
I love to drive across Europe, the furthest I've done is Salou, not sure how that compares distance wise with where you're going.
|
|
|
|
|
I just chickened and it is about the same distance +/- a dead fox or two.
|
|
|
|
|
Do you stop on the way? Sleep in the car or get a hotel?
|
|
|
|
|
We almost go straight through. We'll cross over and stay the night with friends in Brussels, then tomorrow we'll depart around 6 and should be on the beach before sunset. 
|
|
|
|
|
Quote: The time saved is actually negligible,
Really? but you do have to cross over on the wrong side o' the road? , Quote: Fured?
do you mean Balatonfured...
|
|
|
|
|
glennPattonPUB wrote: do you mean Balatonfured...
Igen. That is where we summer, dontchaknow.
|
|
|
|
|
Well I do now, Blantonfured was about the only Holiday location I knew of in Hungry! 
|
|
|
|
|
We've had a house there some six years now and I love it.
|
|
|
|
|
Well at least Malaysian Airline didn't get the hat trick, glad I'm not due to fly anywhere at the moment! 
|
|
|
|
|
Well I am flying from Germany to India. I hope there would me no excitement
cheers,
Super
------------------------------------------
Too much of good is bad,mix some evil in it
|
|
|
|
|
no excitement = no excrement.
|
|
|
|
|
GinNagy cannot flight. There are safety regulations on maximum amount of alcohol per aircraft.
THESE PEOPLE REALLY BOTHER ME!! How can they know what you should do without knowing what you want done?!?!
-- C++ FQA Lite
|
|
|
|
|
CPallini wrote: There are safety regulations on maximum amount of alcohol per aircraft.
Does it include the cargo?
|
|
|
|
|
Shameel wrote: Does it include the self-loading-cargo?
FTFY
|
|
|
|
|
If we keep messing around like this we'll end up as a stone age society, again.
We'll have the knowledge but not the virtue to have nice things.
|
|
|
|
|
When you go to the cinema you'll be hit back into the stone age!
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
