Browse Prior Art Database

Ternary Memory

IP.com Disclosure Number: IPCOM000097771D
Original Publication Date: 1961-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Melan, EH: AUTHOR [+2]

Abstract

Certain magnetic elements, for example, multi-aperture magnetic cores, cores constructed of separate concentric rings and cores constructed of segments of different materials display tri-stable characteristics. In other words, they possess a double threshold hysteresis loop such as that shown.

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Ternary Memory

Certain magnetic elements, for example, multi-aperture magnetic cores, cores constructed of separate concentric rings and cores constructed of segments of different materials display tri-stable characteristics. In other words, they possess a double threshold hysteresis loop such as that shown.

The circuit shows a winding pattern for a matrix memory array constructed of such tri-stable cores. An inhibit or bias winding supplying one unit of bias current Ib in the direction of negative remanence passes through all the cores. Each core also has passing through it a word line Wy capable of supplying two units of current 2 IWy in either the positive or negative remanence direction. There is also a bit line Bx capable of supplying either one unit or two units of current IBx or 2IBx in the direction of positive remanence. Output currents appear on sense lines Sx.

For reading into the memory, two units of current in the direction of positive remanence are applied to the Wy line of the selected memory location. Either zero, one, or two units of current in the direction of positive remanence are applied to the Bx line of the selected memory location. The hysteresis diagram shows that two units of current 21 are needed to switch the core to its I state and three units of current 3I to switch the core to its 2 state. Therefore:

0IBx + 2IWy - Ib = I and the core remains in its 0 state. IBx + 2IWy - Ib = 2I and the core shifts to its I state. 2IBx + 2IWy - Ib =...