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JPS5786951A - Information processor - Google Patents

Information processor

Info

Publication number
JPS5786951A
JPS5786951A JP16380180A JP16380180A JPS5786951A JP S5786951 A JPS5786951 A JP S5786951A JP 16380180 A JP16380180 A JP 16380180A JP 16380180 A JP16380180 A JP 16380180A JP S5786951 A JPS5786951 A JP S5786951A
Authority
JP
Japan
Prior art keywords
address
bit
microinstruction
circuit
logic
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
JP16380180A
Other languages
Japanese (ja)
Other versions
JPS6223890B2 (en
Inventor
Yoshihisa Soda
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP16380180A priority Critical patent/JPS5786951A/en
Publication of JPS5786951A publication Critical patent/JPS5786951A/en
Publication of JPS6223890B2 publication Critical patent/JPS6223890B2/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
    • G06F9/261—Microinstruction address formation

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 perform efficient address assignment by providing a circuit which modifies one bit or bits of a constant part and a circuit which controls which bit of the constant part is to be modified. CONSTITUTION:A microinstruction 101 read out of a microinstruction storage part 4 is held in a microinstruction holding register 1. An instruction code 102 in the register 1 is supplied to a decoding circuit 3 and when a constant is not used as an address, a modification indication signal 103 which has logic 1 is generated. A constat modifying circuit 2 inverts an address bit 104 to output it as an address bit 105 when the signal 103 has the logic 1 or outputs the address bit 104 as it is as the address bit 105 when the signal 103 has logic 0. Then, address bits 105, 106 and 107 are sent as an address 108 to a microinstruction address register 5 to read the next microinstruction out of the circuit 4.
JP16380180A 1980-11-20 1980-11-20 Information processor Granted JPS5786951A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16380180A JPS5786951A (en) 1980-11-20 1980-11-20 Information processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16380180A JPS5786951A (en) 1980-11-20 1980-11-20 Information processor

Publications (2)

Publication Number Publication Date
JPS5786951A true JPS5786951A (en) 1982-05-31
JPS6223890B2 JPS6223890B2 (en) 1987-05-26

Family

ID=15780953

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16380180A Granted JPS5786951A (en) 1980-11-20 1980-11-20 Information processor

Country Status (1)

Country Link
JP (1) JPS5786951A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5350634A (en) * 1976-10-18 1978-05-09 Honeywell Inf Systems Microprogram address double forming device
JPS5398752A (en) * 1977-02-10 1978-08-29 Hitachi Ltd Microprogram control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5350634A (en) * 1976-10-18 1978-05-09 Honeywell Inf Systems Microprogram address double forming device
JPS5398752A (en) * 1977-02-10 1978-08-29 Hitachi Ltd Microprogram control system

Also Published As

Publication number Publication date
JPS6223890B2 (en) 1987-05-26

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