JPS56124953A - Instruction fetch system - Google Patents

Instruction fetch system

Info

Publication number
JPS56124953A
JPS56124953A JP2655280A JP2655280A JPS56124953A JP S56124953 A JPS56124953 A JP S56124953A JP 2655280 A JP2655280 A JP 2655280A JP 2655280 A JP2655280 A JP 2655280A JP S56124953 A JPS56124953 A JP S56124953A
Authority
JP
Japan
Prior art keywords
instruction
latched
ibr
overhead
access
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
JP2655280A
Other languages
Japanese (ja)
Inventor
Takeshi Watanabe
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2655280A priority Critical patent/JPS56124953A/en
Publication of JPS56124953A publication Critical patent/JPS56124953A/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
    • G06F9/30—Arrangements for executing machine instructions, e.g. instruction decode
    • G06F9/38—Concurrent instruction execution, e.g. pipeline, look ahead
    • G06F9/3802—Instruction prefetching

Abstract

PURPOSE:To obtain a profitable instruction fetch system which is suitable for a semiconductor memory, by increasing the number of instruction buffer registers, increasing the number of times of fetching a instruction continuously from the main storage, and reducing the overhead. CONSTITUTION:A main storage MS110 of N byte width by a semiconducdor memory element is placed, and a storage control unit SCU12 being a control logic is connected to this MS110. Also, to this SCU120 are connected the instruction unit IU130 on which M pieces of instruction buffer registers IBR150, 151 of N byte width for latching a fetched instruction are provided, and the execution unit EU140 for executing the instruction latched by the IU130. And, the access is repeated by the number of times of M to the same bank of the MS, the instruction group which has been read out is latched to the IBR's 150, 151, the access of the second time and thereafter is executed in the first half of the execution cyclie of the instruction which has been latched to the IBR's 150, 151, and the overhead is reduced.
JP2655280A 1980-03-05 1980-03-05 Instruction fetch system Pending JPS56124953A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2655280A JPS56124953A (en) 1980-03-05 1980-03-05 Instruction fetch system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2655280A JPS56124953A (en) 1980-03-05 1980-03-05 Instruction fetch system

Publications (1)

Publication Number Publication Date
JPS56124953A true JPS56124953A (en) 1981-09-30

Family

ID=12196678

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2655280A Pending JPS56124953A (en) 1980-03-05 1980-03-05 Instruction fetch system

Country Status (1)

Country Link
JP (1) JPS56124953A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59180635A (en) * 1983-03-31 1984-10-13 Fujitsu Ltd Method for controlling prefetch of instruction
JPS61285542A (en) * 1985-06-12 1986-12-16 Mitsubishi Electric Corp Instruction prefetching method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59180635A (en) * 1983-03-31 1984-10-13 Fujitsu Ltd Method for controlling prefetch of instruction
JPS61285542A (en) * 1985-06-12 1986-12-16 Mitsubishi Electric Corp Instruction prefetching method

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