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Sequential Controller Made up of Two Control Stores Having Identical contents, Particularly for Controlling A Multi-Length Counter

IP.com Disclosure Number: IPCOM000051147D
Original Publication Date: 1982-Aug-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Giunta, RA: AUTHOR

Abstract

A sequential controller for a device such as a multi-length counter is formed in two segments. Each segment has a control store and a register for the output of the control store. The two control stores are identically programmed. They operate independently except for a line from each segment to the other that carries a Halt/Resume signal. The controller operates the counter either to count only at a selected byte position of the counter or to count as a single multi-position counter.

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Sequential Controller Made up of Two Control Stores Having Identical contents, Particularly for Controlling A Multi-Length Counter

A sequential controller for a device such as a multi-length counter is formed in two segments. Each segment has a control store and a register for the output of the control store. The two control stores are identically programmed. They operate independently except for a line from each segment to the other that carries a Halt/Resume signal. The controller operates the counter either to count only at a selected byte position of the counter or to count as a single multi- position counter.

A control store conventionally has a set of control words that each contain a control bit field and a next address field. The next address field permits the control words to be read in a sequence as a program. Address bits can also be supplied from the device that is controlled or from other signal sources to provide branching in the control program. This general technique is used in a controller for a counter. The counter has 32 bits and it can be operated in a 32 bit binary counting sequence, or a selected one of the four byte positions can be incremented through a sequence while the other byte positions remain unchanged. The B Each segment has a read-only store (ROS) and a register. The nputs to the ROS, shown to the left, are address bits that select a particular control word that is then loaded into the register. Each control word of the ROS provid...