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Sebastian Wendel 2024-02-18 12:53:24 +01:00
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@ -27,32 +27,32 @@
<a href="https://en.wikipedia.org/wiki/Toroid">toroids</a>
(rings) of a
<a href="https://en.wikipedia.org/wiki/Hard_magnetic_material">hard
magnetic material</a>
magnetic material</a>
(usually a
<a href="https://en.wikipedia.org/wiki/Ferrite_(magnet)#Semi-hard_ferrites">semi-hard
ferrite</a>). Each core stores one
ferrite</a>). Each core stores one
<a href="https://en.wikipedia.org/wiki/Bit">bit</a>
of information. Two or more wires pass through each core, forming an
X-Y array of cores. When an electrical current above a certain
threshold is applied to the wires, the core will become magnetized.
The core to be written is selected by powering one X and one Y wire
to half of the required power, such that only the single core at the
intersection is written. Depending on the direction of the currents,
the core will pick up a clockwise or counterclockwise magnetic field,
storing a 1 or 0.
This writing process also causes electricity to be
X-Y array of cores. When an electrical current above a certain
threshold is applied to the wires, the core will become magnetized.
The core to be written is selected by powering one X and one Y wire
to half of the required power, such that only the single core at the
intersection is written. Depending on the direction of the currents,
the core will pick up a clockwise or counterclockwise magnetic field,
storing a 1 or 0.
This writing process also causes electricity to be
<a href="https://en.wikipedia.org/wiki/Electromagnetic_induction">induced</a>
into nearby wires. If the new pulse being applied in the X-Y wires is
the same as the last applied to that core, the existing field will do
nothing, and no induction will result. If the new pulse is in the
opposite direction, a pulse will be generated. This is normally
picked up in a separate &quot;sense&quot; wire, allowing the system
to know whether that core held a 1 or 0. As this readout process
requires the core to be written, this process is known as
the same as the last applied to that core, the existing field will do
nothing, and no induction will result. If the new pulse is in the
opposite direction, a pulse will be generated. This is normally
picked up in a separate &quot;sense&quot; wire, allowing the system
to know whether that core held a 1 or 0. As this readout process
requires the core to be written, this process is known as
<i>destructive
readout</i>, and requires additional circuitry to reset the core to
its original value if the process flipped it.
readout</i>, and requires additional circuitry to reset the core to
its original value if the process flipped it.
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