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Browse Prior Art Database

One Latch per Position Counter

IP.com Disclosure Number: IPCOM000094481D
Original Publication Date: 1965-Feb-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Owen, CE: AUTHOR

Abstract

The ring counter has only one latch per position and is operated by staggered shift and reset pulses. Assume latch A to be set to its on condition. The next shift pulse sets latch B to its on condition due to forward feed from latch A. Latch C is not set by forward feed from latch B because it is inhibited by the A connection. Latch A is still on. The reset pulse following the shift pulse resets latch A due to feedback from latch B. Thus, there is slight overlap of output pulses.

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One Latch per Position Counter

The ring counter has only one latch per position and is operated by staggered shift and reset pulses. Assume latch A to be set to its on condition. The next shift pulse sets latch B to its on condition due to forward feed from latch
A. Latch C is not set by forward feed from latch B because it is inhibited by the A connection. Latch A is still on. The reset pulse following the shift pulse resets latch A due to feedback from latch B. Thus, there is slight overlap of output pulses.

The reset pulse must be off when the shift pulse is on. The front edge of the reset pulse must be clear of the back edge of the shift pulse to avoid race conditions. The circuit can also be used as an open chain instead of a ring counter.

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