Browse Prior Art Database

Read/Write Control

IP.com Disclosure Number: IPCOM000074411D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Walker, EL: AUTHOR

Abstract

This write control will allow information to be uniquely written into a single-shift register without affecting remaining shift registers on a chip.

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Read/Write Control

This write control will allow information to be uniquely written into a single- shift register without affecting remaining shift registers on a chip.

When new information is to be written into the shift register a decoded bubble 10 is brought in along the write channel 12, while a bubble 14 from the shift register leaves along the read channel 16. At position 1 the bubbles 10 and 14 are in the shift register and write channels in the locations shown. As the H (X,Y) field rotates from 1 position to 2 position the write line 18 is pulsed in a direction which cancels the field of the T bar directly in front of the shift register bubble 14. At the 2 position of H (X,Y), the decoded bubble 10 proceeds on the right tip of the T bar 20 and the shift register bubble 14, being repelled by the write line, will travel down the H bar 22 toward the 2 position. However, it cannot reach the 2 position due to the repelling force of interaction between the bubbles 10 and 14. This causes the shift register bubble 14 to become stable between 1 and 2 positions on the H bar 22. The data line 24 is now either pulsed to implode the decoded bubble 10 or not pulsed, depending on what new information is to be written into the register. At the same time, the destruct line 26 is pulsed and the shift register bubble 14, which is stable between 1 position and 2 position since there is no in-plane field at this time, implodes. At 4 position of H (X,Y), the new information en...