Browse Prior Art Database

Sequence Distributed ROS Control

IP.com Disclosure Number: IPCOM000089356D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kerrigan, M: AUTHOR [+2]

Abstract

Control ROS (read-only storage) chips store microinstructions which make up a microprogram. In order to avoid storing repetitions of the same microinstructions which are part of different microprogram sequences, use has been made of a separate sequencer ROS which stores next addresses of nonrepetitive microinstructions in the control ROS. By changing the sequencer ROS, new sequences of control ROS microinstructions required for the execution of new logical functions can be implemented.

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Sequence Distributed ROS Control

Control ROS (read-only storage) chips store microinstructions which make up a microprogram. In order to avoid storing repetitions of the same microinstructions which are part of different microprogram sequences, use has been made of a separate sequencer ROS which stores next addresses of nonrepetitive microinstructions in the control ROS. By changing the sequencer ROS, new sequences of control ROS microinstructions required for the execution of new logical functions can be implemented.

A further reduction in the size of the control ROS as well as an increase in the number of functions which may be performed by combinations of the control ROS microinstructions is achieved by placing not only the next address field in the external sequencer ROS but also the branch, exit and start instruction fields. New functions are accommodated merely by adding additional sequencer ROS chips which permit new sequences through the control ROS chips without increasing the instructions stored in the control ROS.

Recent technology advances permit rapid cycling through the control ROS many times, under control of the sequencer ROS, for maximum flexibility in the use of control ROS fields for executing desired logical functions.

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