Re: clock, data, and power on same line?
"Jon Slaughter" <Jon_Slaughter@xxxxxxxxxxx> writes:
Is there any theorical reason why this can't be done?
It has been done. The Dallas/Maxim 1-wire protocol has power, clock,
and data all on one wire.
How?
The line is normally at +5v (providing power, devices have a diode and
cap to maintain it during signalling).
Each falling edge is the "clock" signal.
Each rising edge is the "data" signal - short duration low pulse =
binary 1, long duration = binary 0.
.
Relevant Pages
- Re: 96 cabrio possible electrical prob?
... > circumstances the clock has been reset. ... so it's apparently not a system-wide power outage going on here. ... way to stop the clock is to disconnect this wire. ...
(rec.autos.makers.vw.watercooled) - Re: Embedded clocks
... timing or amplitude measurement. ... synchronize the clock to a fixed rate bit stream. ... The one-wire designs change from a classic clock (which draws power all the time) to a more async-based monostable. ... With one wire, the master provides the edges, and the slave the data, and the slave can use very cheap / low power / fast wakeup RC oscillator. ...
(comp.arch.fpga) - Re: [linux-pm] Power Management framework proposal
... this API is not trying to represent the parent-child hierarchy. ... That is not part of the fw: the fw simply expresses parent-child clock ... The very same idea of power mode is something that can maybe fit some ... kernelspace or strictly userspace. ...
(Linux-Kernel) - Re: [linux-pm] Power Management framework proposal
... the clock framework? ... capable drivers having another, embeded devices presenting a third, etc ... the user of this API doesn't care how something is done, it just wants to know what's possible and how to tell the system to switch modes. ... this is more then just setting the clocks on everything becouse some power modes are not easily represented just as clocks. ...
(Linux-Kernel) - Re: The real twin paradox.
... Sue, on the other hand, claims that the traveling twin's clock ... I may give up drinking water because the pipes ... The light in an AC power cord does not weigh much so it ... You can be wrong and the capacitor banks still be required. ...
(sci.physics.relativity) |
|
