Browse Prior Art Database

Read/Write Decoder

IP.com Disclosure Number: IPCOM000074410D
Original Publication Date: 1971-Apr-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Walker, EL: AUTHOR

Abstract

This decoder will decode signals for both reading and writing.

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Read/Write Decoder

This decoder will decode signals for both reading and writing.

During a write operation a bubble is introduced at the front end on every decoder on the chip. As the bubbles propagate in the direction indicated by the arrow 10, they cross over the address lines 12a, 14a, 16a. The address lines are formed into loops directly in the path of the bubbles. As can be seen these loops are oriented in different directions and the loops in each decoder path, such as path 10, are arranged in a particular combination of directions peculiar to that path. Thus the magnetic field introduced by current passing through an address line will enhance the bubble in one decoder path and implode the bubble in the adjacent decoder path. Hence half the bubbles will be imploded as they cross the first address line 12a and half the remaining bubbles will be imploded as they cross the second address line 14a, and so on. Since half the bubbles are imploded as they cross each address line, a decoder with n address lines will eliminate all but one of the 2n bubbles that are introduced into the decoder. The current directions illustrated for the address lines 12a to 16a are those which will pass a bubble through the illustrated decoder line 10.

During the read operation, all the bubbles take the path 18 till point (a) is reached. The path the bubble takes thereafter will depend on the direction of the current flowing in the address lines 12 to 16. At each address line the bub...