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JPS56147243A - Microprogram control device - Google Patents

Microprogram control device

Info

Publication number
JPS56147243A
JPS56147243A JP4984980A JP4984980A JPS56147243A JP S56147243 A JPS56147243 A JP S56147243A JP 4984980 A JP4984980 A JP 4984980A JP 4984980 A JP4984980 A JP 4984980A JP S56147243 A JPS56147243 A JP S56147243A
Authority
JP
Japan
Prior art keywords
operation code
register
instruction
memory
outputs
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.)
Pending
Application number
JP4984980A
Other languages
Japanese (ja)
Inventor
Masaki Fujiki
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 JP4984980A priority Critical patent/JPS56147243A/en
Publication of JPS56147243A publication Critical patent/JPS56147243A/en
Pending 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
    • G06F9/264—Microinstruction selection based on results of processing

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 make the control memory small-sized, by making it possible to change micro instructions to be executed in accordance with conditions, in the microprogram control device using a read-only memory as the control memory. CONSTITUTION:For example, if the micro instruction where the operation code field, the first operand field, and the second operand field designate LOAD, operation code register 3, and a general register respectively is executed, contents of the designated general register are set to operation code register 3 to which an optinal operation code is set by micro instructions. If the instruction read from control memory 2 has an operation code to ''select'' operation code register 3, operation code decoder 6 outputs a prescribed control signal, and multiplexer 4 selects and outputs the operation code of register 3. If the said instruction has an operation code to ''add'', the control signal is transmitted to arithmetic and logical unit 5 to execute addition. Consequently, it is unnecessary to store all of plural kinds of microprograms different only partially.
JP4984980A 1980-04-15 1980-04-15 Microprogram control device Pending JPS56147243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4984980A JPS56147243A (en) 1980-04-15 1980-04-15 Microprogram control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4984980A JPS56147243A (en) 1980-04-15 1980-04-15 Microprogram control device

Publications (1)

Publication Number Publication Date
JPS56147243A true JPS56147243A (en) 1981-11-16

Family

ID=12842500

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4984980A Pending JPS56147243A (en) 1980-04-15 1980-04-15 Microprogram control device

Country Status (1)

Country Link
JP (1) JPS56147243A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62285137A (en) * 1986-06-04 1987-12-11 Hitachi Ltd digital signal processing processor
JPH01233527A (en) * 1988-03-15 1989-09-19 Toshiba Corp Self-testing circuit for information processor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62285137A (en) * 1986-06-04 1987-12-11 Hitachi Ltd digital signal processing processor
JPH01233527A (en) * 1988-03-15 1989-09-19 Toshiba Corp Self-testing circuit for information processor

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