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Hole Coupling Read Only Store

IP.com Disclosure Number: IPCOM000093106D
Original Publication Date: 1967-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Gamblin, RJ: AUTHOR

Abstract

In a linear passive read-only store, as shown in A, one of a plurality of word drivers 2 is selected by a suitable selection network. At a bit position 4, there is either the presence or absence of a linear passive element which connects the drive DL 6 to a bit BL 8. The latter, in turn, connects the corresponding bit position of all the words in the memory together. BL 8 generally returns to a sense amplifier SA 10 in which the absence or presence of a connection at a particular word causes or does not cause an output.

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Hole Coupling Read Only Store

In a linear passive read-only store, as shown in A, one of a plurality of word drivers 2 is selected by a suitable selection network. At a bit position 4, there is either the presence or absence of a linear passive element which connects the drive DL 6 to a bit BL 8. The latter, in turn, connects the corresponding bit position of all the words in the memory together. BL 8 generally returns to a sense amplifier SA 10 in which the absence or presence of a connection at a particular word causes or does not cause an output.

This electromagnetic read-only store is not troubled by multiple reflections and the integration of the output signal to avoid the reflection problem. Additionally, there is significant power saving in the transfer path permitting the use of simpler sense amplifiers.

This read-only store uses electromagnetic coupling between DL 6 and a BL 8 in a high-speed strip line structure. Each DL consists of a strip line which runs between an upper ground plane UGP 12, shown in B, and a center ground plane CGP 14. A BL 8 consists of a strip line which runs between CGP 14 and a lower ground plane LGP 16.

A BL 8 runs at an angle to a DL 6 which ranges between 60 degrees and 75 degrees. The linear passive element which couples a DL 6 with a BL 8 is a hole in CGP 14. If there is no hole in CGP 14, there is no coupling between the lines and a 0 instead of a 1 is expressed.

A suitable bit line is 5 mm wide. Shielding, not shown in B,...