JPS5797148A - Branch control system of microprogram - Google Patents

Branch control system of microprogram

Info

Publication number
JPS5797148A
JPS5797148A JP17346180A JP17346180A JPS5797148A JP S5797148 A JPS5797148 A JP S5797148A JP 17346180 A JP17346180 A JP 17346180A JP 17346180 A JP17346180 A JP 17346180A JP S5797148 A JPS5797148 A JP S5797148A
Authority
JP
Japan
Prior art keywords
code
address
branch
control
control memory
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP17346180A
Other languages
Japanese (ja)
Other versions
JPS6130295B2 (en
Inventor
Kiyosumi Sato
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17346180A priority Critical patent/JPS5797148A/en
Publication of JPS5797148A publication Critical patent/JPS5797148A/en
Publication of JPS6130295B2 publication Critical patent/JPS6130295B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/22—Microcontrol or microprogram arrangements
    • G06F9/26—Address formation of the next micro-instruction ; Microprogram storage or retrieval arrangements
    • G06F9/262—Arrangements for next microinstruction selection

Landscapes

  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)

Abstract

PURPOSE:To execute a branch control without making a control memory larger than required, by operating a desired address by use of a next address code provided in a micro-instruction, and a selected branch index code. CONSTITUTION:In an area of a block ''0'' of a control memory 2, an index field SI for generating an address of a branch destination is provided. When an address controlling circuit 4 discriminates a branch instruction, one of said branch index codes SI0-SI3 is selected by a next address code NA in the micro- instruction which has been read out from the control memory 2, and an address control code AC, said code NA and the selected branch index code SI are operated by an operating means 9, new address information is generated, and the control memory 2 is accessed. In this way, the instruction function is expanded without making the control memory 2 larger than required, and complicated control is executed.
JP17346180A 1980-12-09 1980-12-09 Branch control system of microprogram Granted JPS5797148A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17346180A JPS5797148A (en) 1980-12-09 1980-12-09 Branch control system of microprogram

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17346180A JPS5797148A (en) 1980-12-09 1980-12-09 Branch control system of microprogram

Publications (2)

Publication Number Publication Date
JPS5797148A true JPS5797148A (en) 1982-06-16
JPS6130295B2 JPS6130295B2 (en) 1986-07-12

Family

ID=15960897

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17346180A Granted JPS5797148A (en) 1980-12-09 1980-12-09 Branch control system of microprogram

Country Status (1)

Country Link
JP (1) JPS5797148A (en)

Also Published As

Publication number Publication date
JPS6130295B2 (en) 1986-07-12

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