CPU <> Memory chip communication interface
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From: Skybuck Flying on 5 Aug 2005 02:20 "Pooh Bear" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message news:42F2F56E.2B3369B2(a)hotmail.com... > > Skybuck Flying wrote: > > > Nice introduction to signals across a wire. > > > > http://penguin.dcs.bbk.ac.uk/academic/technology/physical-layer/asynchronous/index.php > > > > I never understood the difference between voltage and ampere... to bad this > > page doesn't discuss how ampere is related to voltage. (voltage<->ampere > > very confusing ) > > That's pretty fundamental. The classic example is to compare electricity to water. > > Voltage is like water pressure - current is like water flow. With no pressure no water > flows. The larger the pipe ( less resistance to flow ) the more water flows. In a similar > way, the less electrical resistance, the more Amps flow in a circuit for a given voltage. Does this mean a pipe diameter (of a certain material) always allows a certain maximum voltage ? So if the source of the voltage becomes to high the pipe blows ? :) Probably yes, ok that's easy. Now what about two different pipes: Pipe A has a large diameter with a maximum of 100 volts to flow through it. Pipe B has a small diameter with a maximum of 15 volts to flow through it. Source A has a pressure of 14 volts and is connected to pipe A. Source B has a pressure of 14 volts and is connected to pipe B. I have two meters. I stick a voltmeter A in pipe A.... what would it measure ? I stick a voltmeter B in pipe B... what would it measure ? Both would probably measure 14 volts. The difference would be the ampere. The flow through pipe B would have to be faster, since it's smaller. The flow through pipe A could be slower, since it's wider. According to your explanation: Sticking an ampere meter in pipe A should show a lower ampere. Sticking an ampere meter in pipe B should show a higher ampere. If this is how it works I think I understand it a little bit :) However microelectronics are very very very small. So for me it's hard to see the diameter and the resistance... (resistance is related to the material ;)) :) Ok I think I am starting to get it. Let's see even a more complex example: Pipe A is split up into Pipe A1 with a diameter of allowing 5 volts Pipe A2 with a diameter of allowing 95 volts. Now a good question is the following: The voltage at pipe A1 would be 5 volts ? or would it blow up ? It could be possible that the remaing 9 volts would simply go into pipe A2... It probably depends on the strength of pipe A1... At this point I really wouldn't know what the answer is ;) Maybe it's related to the resistance or something... if it could resists 15 volts it might survive... But I don't think this is what resistance means ? or maybe it does ? I thought resistance means how much voltage is lost.... Maybe this is the correct answer after all... if Pipe A1 has a resistance of 9 volts it could allow 5 volts to flow through it... But what would happen to the other 9 volts ? Would it go lost in Pipe A1 or would it flow through Pipe A2 without loss ? I dont think the voltage would be simply halfed... since that's not how water behaves ;) So the point is: The concepts pressure, flow, maybe even resistance are easy to understand... but how it behaves in reality especially in electronics is a little bit more difficult to understand ;) Unless the answers are really simple... so I am curious what the answer(s) would be :) Especially the splitting up of the pipe question ;) Bye, Skybuck.
From: Pooh Bear on 5 Aug 2005 02:35 Skybuck Flying wrote: > I have no idea what a north bridge and south bridge chip is... but could > this be the same design ? :):):) Yeah ! No surprise sunshine ! Why not simply do some self-study ? It worked for me. Graham
From: Pooh Bear on 5 Aug 2005 02:37 Skybuck Flying wrote: > "Pooh Bear" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message > news:42F2F56E.2B3369B2(a)hotmail.com... > > > > Skybuck Flying wrote: > > > > > Nice introduction to signals across a wire. > > > > > > > http://penguin.dcs.bbk.ac.uk/academic/technology/physical-layer/asynchronous/index.php > > > > > > I never understood the difference between voltage and ampere... to bad > this > > > page doesn't discuss how ampere is related to voltage. (voltage<->ampere > > > very confusing ) > > > > That's pretty fundamental. The classic example is to compare electricity > to water. > > > > Voltage is like water pressure - current is like water flow. With no > pressure no water > > flows. The larger the pipe ( less resistance to flow ) the more water > flows. In a similar > > way, the less electrical resistance, the more Amps flow in a circuit for a > given voltage. > > Does this mean a pipe diameter (of a certain material) always allows a > certain maximum voltage ? > > So if the source of the voltage becomes to high the pipe blows ? :) That would be exceptional and irrelevant to any sensible understanding. I'm getting bored of your trolling now..... Graham
From: Skybuck Flying on 5 Aug 2005 03:48 "Pooh Bear" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message news:42F3092F.FA71FA17(a)hotmail.com... > > Skybuck Flying wrote: > > > "Pooh Bear" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message > > news:42F2F56E.2B3369B2(a)hotmail.com... > > > > > > Skybuck Flying wrote: > > > > > > > Nice introduction to signals across a wire. > > > > > > > > > > http://penguin.dcs.bbk.ac.uk/academic/technology/physical-layer/asynchronous/index.php > > > > > > > > I never understood the difference between voltage and ampere... to bad > > this > > > > page doesn't discuss how ampere is related to voltage. (voltage<->ampere > > > > very confusing ) > > > > > > That's pretty fundamental. The classic example is to compare electricity > > to water. > > > > > > Voltage is like water pressure - current is like water flow. With no > > pressure no water > > > flows. The larger the pipe ( less resistance to flow ) the more water > > flows. In a similar > > > way, the less electrical resistance, the more Amps flow in a circuit for a > > given voltage. > > > > Does this mean a pipe diameter (of a certain material) always allows a > > certain maximum voltage ? > > > > So if the source of the voltage becomes to high the pipe blows ? :) > > That would be exceptional and irrelevant to any sensible understanding. > > I'm getting bored of your trolling now..... I am not trolling I am trying to understand it. But ok I can see how a dirty mind might think that's funny. And in case you didn't understand that sentence here it is again: So if the pressure of source of the voltage becomes to high the pipe blows ? Without the smiley :D :P :D Bye, Skybuck.
From: Skybuck Flying on 5 Aug 2005 03:49
"Skybuck Flying" <nospam(a)hotmail.com> wrote in message news:... > > "Pooh Bear" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message > news:42F3092F.FA71FA17(a)hotmail.com... > > > > Skybuck Flying wrote: > > > > > "Pooh Bear" <rabbitsfriendsandrelations(a)hotmail.com> wrote in message > > > news:42F2F56E.2B3369B2(a)hotmail.com... > > > > > > > > Skybuck Flying wrote: > > > > > > > > > Nice introduction to signals across a wire. > > > > > > > > > > > > > > http://penguin.dcs.bbk.ac.uk/academic/technology/physical-layer/asynchronous/index.php > > > > > > > > > > I never understood the difference between voltage and ampere... to > bad > > > this > > > > > page doesn't discuss how ampere is related to voltage. > (voltage<->ampere > > > > > very confusing ) > > > > > > > > That's pretty fundamental. The classic example is to compare > electricity > > > to water. > > > > > > > > Voltage is like water pressure - current is like water flow. With no > > > pressure no water > > > > flows. The larger the pipe ( less resistance to flow ) the more water > > > flows. In a similar > > > > way, the less electrical resistance, the more Amps flow in a circuit > for a > > > given voltage. > > > > > > Does this mean a pipe diameter (of a certain material) always allows a > > > certain maximum voltage ? > > > > > > So if the source of the voltage becomes to high the pipe blows ? :) > > > > That would be exceptional and irrelevant to any sensible understanding. > > > > I'm getting bored of your trolling now..... > > I am not trolling I am trying to understand it. But ok I can see how a dirty > mind might think that's funny. > > And in case you didn't understand that sentence here it is again: > > So if the pressure of source of the voltage becomes to high the pipe blows ? Ok one more try: So if the pressure of source of the voltage becomes to high the pipe blows up ? ;) Bye, Skybuck. |