DE1226147B - Magnetic core storage device - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

H03k

German KL: 21 al - 36/16

Number: 1226147

File number: N 21746 VIII a / 21 al

Filing date: June 23, 1962

Opening day: October 6, 1966

The invention relates to a magnetic core memory device with memory cores made of magnetic material which has remanence and with at least two groups of lines for selecting and driving the magnetic cores. S. In such a known magnetic storage device, the pulses simultaneously fed to the lines, the first and the second group are each effective on storage cores of magnetic material with a rectangular hysteresis loop coupled to the lines, the one at the intersection of the line of the first group and the line of the second group attached core is magnetized by both pulses. The strength of the magnetic field generated by a pulse in a core must not exceed the coercive force, while the strength of the magnetic field in the core magnetized by both pulses must exceed the coercive force in order to be able to change the state of remanence of this core. The ao permissible pulse strength is relatively low in these memories, so that the switching time, ie the time during which the core changes its remanence state under the control of both pulses, is relatively long. ; During the reading of remanent states of a core in such a known memory under the control of two pulses, an already read core can provide an output signal which is dependent on the ratio between the saturation inductance and the remanent induction, while a core that has not yet been read is under control of a pulse can provide an output signal which occurs via the reading line common to all cores and which is dependent on the ratio between the induction at a magnetic field strength equal to d @ $ half of the coercive force and the remanent induction. In order to reduce the two possible A and output signals to a minimum at the same time, magnetic materials are used in the known storage devices whose square ratio, i.e. the ratio between the saturation induction and the induction of the core magnetized in the opposite sense by a magnetic field of half the coercive force comes as close as possible to the value 1.

To compensate for the insufficient squareness of the hysteresis loop of magnetic cores with high remanence and thus for the neutralization of interfering signals, it is known to each magnetic core assign an auxiliary core with high remanence or relatively low remanence, with im Magnetic core storage device

Applicant:

N. V. Philips' Gloeilampenfabrieken,

Eindhoven (Netherlands)

Representative:

Dr. rer. nat. P. Roßbach, patent attorney,

Hamburg 1, Mönckebergstr. 7th

Named as inventor:

Wijnand Johannes Schoenmakers,

Eindhoven (Netherlands)

Claimed priority:

Netherlands of June 27, 1961 (266 427)

In the last case, several magnetic cores with high remanence can be assigned to such an auxiliary core. ; In contrast, it is the purpose of the invention to create a memory of the type mentioned at the outset, in which the switching time of the cores is considerably shorter and cores made from a magnetic one can be used Material that has remanence, with no requirements for the square ratio of the Materials are provided.

The magnetic core memory device is characterized in that each memory core is coupled in opposite directions with two through parallel connection to a single line of a first group of combined auxiliary lines which ^1, each coupled to an auxiliary core of magnetically saturable material, the line of the first group unipolar current pulses supplied which are split into two partial currents flowing through the two auxiliary lines, which magnetize the storage core in opposite directions, each auxiliary core being connected to a line of the second group through which a bias current flows and which counteracts the magnetic effect of the auxiliary line through which a partial current may flow and sets the auxiliary core in the saturation range, and means are present for at least partial cancellation of the bias of the one or

609 669/371

1226 14t ■■■ · ■: - '■■ "- ■■■" ^:: -

of the other auxiliary belonging to a memory core - the second 'flu' - coupled. The cores are also such that an auxiliary line flowing through the auxiliary line coupled to this auxiliary windings 22 of the core of a storage column core is coupled with the same control line of the second group to counteract the passage of the current to the core. In the example, the windings 21 produce flux changes and a unipolar current pulse supplied to the first group of the line of the 5 -ψιά '^ Ι -miteinanler is connected to the relevant control lines. · Mainly flows through the other auxiliary line and, for the sake of simplicity, the drawing shows a disconnected T-line that is coupled to all of the storage cores with the storage core in the desired remanence-coupled state. '"left. This line can be known to, not here

One advantage of this device is that it is interestingly coupled with all cores and the lines fed to the lines of the first group are connected to an amplifier which can handle pulses regardless of the direction in which the point in time when the remanence state of a pulse occurs Cores have to magnetize, the same core is read, is made sensitive.
And the dwell time of the memory is as follows. The cores 15 gate circuits 17 and 18 coupled to the lines of the second group are normally in the state for transition from the magnetically saturated supplying state and feed the current from the state to the magnetically unsaturated state in current sources 19 and 20 to the goal scoring sequence of the small river changes that occur. connected lines of the second gene is very short. Group. This current magnetizes cores 3 and 4

The invention is described below with reference to FIGS. 20 through to the range of magnetic saturation. In

Drawing explained in more detail. · '. ■ * - F i g. 2a is the idealized magnetic characteristic of

Fig. 1 shows an example of magnetic storage cores 3: and 4 illustrating the relationship

chers according to the invention, and between the induction and the current through a

F i g. 2 shows some magnetic characteristics for the winding. indicates. The current through the winding

Explanation of the in Fig. 1 shown example ·. 25 gen 21 and 22 is, for example, equal to Z ₁ , so that the induction

In FIG. 1, K ₁ to K ₉ denote cores from "magnetization" in the flat part of the characteristic curve

table material that has remanence. Everyone who is hired. The change in induction as a result

Storage cores is with two auxiliary lines H ₁ and H ₂ a change in the current intensity is in this case

coupled in series with windings 1 and 2 are particularly low, so that windings 1 and 2

the cores 3 -and-4- made of magnetically saturable material 30 have a low self-induction. The cores 3

rial are connected in series .. The two series - and 4 'and the windings attached to them are

lines of the line H ₁ and the winding 1 un <J of the same dimension, so that a connection point

Line H ₂ and winding 2 are current pulses applied to windings 1 and 2

a coupling with a memory core in opposite directions splits into two equal parts, one of which

connected in parallel in the set sense. 35 part through winding 1 and auxiliary line H ₁

The memory further contains a first group of «■ - and the other part by the winding 2 and the

Control lines S ^ to 7, to which the pulse sources 8 auxiliary line H ₂ 'flows. The auxiliary lines. H ₁ and H ₂

to 10 are connected, and a second group are in the opposite sense with the memory

of control lines 11 to 16. The second group is coupled to the cores so that the magnetic effects

divided into two subgroups, the lines 40 facing each other in terms of the current through the auxiliary lines.

11 to 13 or .14 to 16 included. The lines. equalize on both sides. The two current pulses hit

of the subgroups are via the gates 17 at the connection point of the. Auxiliary lines H ₁

or 18 to the direct current sources 19 or, 20 and H ₂ together and flow: together after the

closed. Connection point of windings 1 and 2 of the

-; The memory cores K ₃ to K ₉ are cores 3 and 4 following next in the same direction at intersections 45

set lines of the first group and line storage row.

are arranged in the second group and form the self-induction of one of the windings 1

made a two-dimensional matrix of or 2 larger in this way, the

Storage elements. The kernels at the crossing point of the. supplied to both windings

put a line of the first group and line 50 pulse in two unequal .. parts. The magnetic

The second group forms a memory row * Effect of the currents through the auxiliary lines H ₁

The antiparallel connections of the memory cores and H ₂ to the memory cores coupled therewith

Cores of a memory row coupled auxiliary line are not balanced in this case, so that the

Genes are magnetic in a certain direction with the same control line as the first storage core

Group coupled. In the example, the anti- 55 are set and the remanence state is set accordingly.

Parallel circuits are connected in series with one another. When the effect of the current through

and in series to the relevant control line ange ^ - the auxiliary line H ₁ prevails, the core z. B.

closed. 'led to the positive remanence state, and if so

The cores 3 and 4, made of magnetically saturable material, are dominated by the windings 21 and 22 respectively, when the effect of the current through the auxiliary line H _{2 is} prevailing, if it gets into the negative remanence state that is interlocked with various control lines. To get a specific memory core, e.g. B. different subgroups of the second group ge the core K ₂ in a certain, z. B. positive couples. The memory cores and the associated remanence state - to lead, cores 3 and 4, which at the .Kreuzungsstteile a pulse on the line 5 and-on a control terminal line of the second group and the lines of 65 of the gate circuit 17 is supplied, whereby the Stream first group are attached, form a storage - "through the line 12 pulse-shaped in a column. The windings 21 of the cores 3 _{converts a Sp'eir value z Q} , which corresponds to the kink in the in FIG. 2 a cherkolonne are with the same control line shown magnetic characteristic of the core 4

is equivalent to. There is no change in induction, so that the switching time of the core 4 is very short. The pulse of the line 5 is fed via the anti-parallel connection of the auxiliary lines H ₁ and H ₂ coupled to the core K ₁ to the connection point of the windings 1 and 2 at the intersection of the lines 12 and 15 with the line 5. The current is divided over the windings 1 and 2, with the largest part flowing through the winding 1, since the current flowing through the winding 2 demagnetizes the core 4 along the steep part of the magnetic characteristic, so that the winding 2 has a high self-induction which counteracts the passage of current. The magnetic effect of the current through the auxiliary line H ₁ exceeds the effect of the current through the auxiliary line H ₂ , and the core K ₂ is brought into the positive remanence state. The setting of the negative remanence state takes place in a corresponding manner in that a pulse is fed to a control terminal of the gate circuit 18, ao whereby the winding 1 receives a high self-induction which counteracts the passage of current. In this case, the current through the auxiliary line H _{2 is} greater than the current through the auxiliary line H ₁ , so ¹ ″ the core K _{2 is} magnetized in a negative sense

The amplitude of the excitation of a storage core due to the difference between the currents through it the auxiliary lines can be chosen many times larger than the coercive force, thereby reducing the memory cores can change their state of remanence within a very short time.

Figure 2b shows a hysteresis loop illustrating the relationship between the induction B and the magnetic field H of a magnetic material suitable for use in the memory according to the invention. A storage core made of such a material has the two remanence states P and N. According to the definition given at the beginning, the rectangular ratio of the material is equal to the ratio between the saturation induction B _s and the induction B ₁ when excited in the opposite sense by a magnetic field - | i? c is equal to half the coercive force Hc. Fig. 2c shows an idealized hysteresis loop of a magnetic material with a squareness ratio equal to 1, which is suitable for use in known memories. The invention thus also has the advantage that cores can be used with a square ratio that differs greatly from the value 1, and that the storage cores can be produced from a cheaper material.

When reading the remanence state of a memory core this is in a certain, z. B.

brought the negative remanence state, and the induction change of the nucleus is caused by a with all cores coupled read line examined. If a nucleus is already in the negative remanence state, so it is satiated in a negative sense, and when the excitation is ceased the induction returns back to the negative remanence state. The induction changes that occur are preferred minimal, so that magnetic materials with a ratio close to 1 between remanent induction and saturation induction are preferred.

Claims (1)

Claim: Magnetic core storage device with storage cores made of magnetic material, the remanence having, and at least two groups of lines for selecting and driving the Magnetic cores, characterized in that each memory core in opposite Direction is coupled with two by parallel connection to a single line a first Group united auxiliary lines, which each with an auxiliary core made of magnetically saturable Material are coupled, the line of the first group being supplied with unipolar current pulses which are split into two partial currents flowing through the two auxiliary lines, which magnetize the memory core in opposite directions, each auxiliary core connected to a line of the second group through which a bias current flows is which of the magnetic effect of the possibly flowed through by a partial current Auxiliary line counteracts and sets the auxiliary core in the saturation range, and where Means are available for at least partially canceling the premagnetization of the one or the other auxiliary core belonging to a memory core, such that a through the with this auxiliary core coupled auxiliary line flowing partial current in the core of the current passage causes counteracting flow changes and one of the leadership of the first group The supplied unipolar current pulse flows mainly through the other auxiliary line and the Sets the memory core to the desired remanence state. Considered publications:
German Patent No. 1,009,237;
U.S. Patents Nos. 2,734,182, 2,666,151,
367. 1 sheet of drawings 609 669/371 9.66 © Bundesdruckerei Berlin