Browse Prior Art Database

Programmable Strobe Variation

IP.com Disclosure Number: IPCOM000092902D
Original Publication Date: 1967-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Meadows, JE: AUTHOR [+3]

Abstract

In the operation of reading data stored in a magnetic memory, the read currents produce noise that makes it difficult to detect the voltage produced by a storage element. To minimize the effects of this noise, the detecting circuits are turned on only during the short time when a signal is expected. This operation is called strobing.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 93% of the total text.

Page 1 of 2

Programmable Strobe Variation

In the operation of reading data stored in a magnetic memory, the read currents produce noise that makes it difficult to detect the voltage produced by a storage element. To minimize the effects of this noise, the detecting circuits are turned on only during the short time when a signal is expected. This operation is called strobing.

Although many storage elements are read during a single operation, their signals appear in a sequence as the read currents propagate through the memory. Many memories include a strobe delay line 2 that produces a sequence of strobe signals. These are staggered in the same way that signals are expected to appear from consecutive bytes of the word that is being read. The circuit shown provides for advancing or retarding these signals to achieve optimum timing.

The strobe signal on line 3 is applied to delay 2 through one of three paths established by Or 4 and And's 5, 6, and 7. The strobe signal is applied directly to And 5. It is applied to And's 6 and 7 through selected delays, for example, a 5 nanosecond delay and a 10 nanosecond delay. A selected one of the And's is conditioned in response to signals on lines 8 and 9. Or-Invert 12 combines the signals on lines 8 and 9 and controls And 6 to produce the normal timing which is delayed by 5 nanoseconds. A signal on line 8 controls And 5 to advance the strobe signals by 5 nanoseconds with respect to the timing of And 6. A signal on line 9 controls And 7 to...