Method and circuit arrangement for sequencing microinstruction sequences in data processing equipment

US4156900A · kind A · utility

Assignee

• Nixdorf Computer AG · DE

Inventors

• Gerhard Gruno · Berlin, DE
• Wolfgang Matschke · Berlin, DE
• Wolfgang Lohnstein · Berlin, DE

Key dates

• Filing date: Apr 18, 1977
• Grant date: May 29, 1979
• Expiry date: Apr 18, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G06F9/265
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

Abstract

A circuit for sequencing microinstruction sequences in data processing equipment in which during the course of a primary sequence subroutine jumps are performed and subsequences are carried out and at the end of each, a return jump into the primary sequence takes place due to the control provided by a temporarily stored return jump address at a point in the sequence at which a two-part branching instruction is to be evaluated. The first part of the branching instruction characterizes a branching function which is to be carried out dependent on a decision which is specified in the second part thereof. The circuit includes a microinstruction storage from which microinstruction sequences are taken over depending upon the output signals from a central fixed-cycle control circuit fed into a microinstruction register and a recoder which is arranged thereafter. The central fixed-cycle control circuit feeds into the microinstruction register, through a control signal which characterizes a return jump, a first output signal for maintaining the return jump instruction stored in the microinstruction register and a second output signal for the additional taking over of the branching instructio…