JPS57136254A - Arithmetic processor - Google Patents

Arithmetic processor

Info

Publication number
JPS57136254A
JPS57136254A JP56021065A JP2106581A JPS57136254A JP S57136254 A JPS57136254 A JP S57136254A JP 56021065 A JP56021065 A JP 56021065A JP 2106581 A JP2106581 A JP 2106581A JP S57136254 A JPS57136254 A JP S57136254A
Authority
JP
Japan
Prior art keywords
arithmetic
circuit
microprogram
output
steps
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
JP56021065A
Other languages
Japanese (ja)
Other versions
JPS6244657B2 (en
Inventor
Toshikatsu Nagasawa
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 JP56021065A priority Critical patent/JPS57136254A/en
Publication of JPS57136254A publication Critical patent/JPS57136254A/en
Publication of JPS6244657B2 publication Critical patent/JPS6244657B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
    • G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
    • G06F7/57—Arithmetic logic units [ALU], i.e. arrangements or devices for performing two or more of the operations covered by groups G06F7/483 – G06F7/556 or for performing logical operations

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computational Mathematics (AREA)
  • Computing Systems (AREA)
  • Mathematical Analysis (AREA)
  • Mathematical Optimization (AREA)
  • Pure & Applied Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Executing Machine-Instructions (AREA)

Abstract

PURPOSE:To decrease the number of steps of a microprogram for a microprogram control type information processor, by controlling the arithmetic operation of an arithmetic logical circuit with the output of an arithmetic mode switching circuit. CONSTITUTION:An arithmetic logical circuit 8 that carries out an operation indicated by a microprogram is provided along with an arithmetic mode switching circuit 6 that selects an arithmetic mode in accordance with the conditions of the input data of the circuit 8. The arithmetic operation of the circuit 8 is controlled by the output of the circuit 6. As a result, the number of steps can be decreasd for a microprogram in case the absolute value is obtained for the fixed decimal point data.
JP56021065A 1981-02-16 1981-02-16 Arithmetic processor Granted JPS57136254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56021065A JPS57136254A (en) 1981-02-16 1981-02-16 Arithmetic processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56021065A JPS57136254A (en) 1981-02-16 1981-02-16 Arithmetic processor

Publications (2)

Publication Number Publication Date
JPS57136254A true JPS57136254A (en) 1982-08-23
JPS6244657B2 JPS6244657B2 (en) 1987-09-22

Family

ID=12044479

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56021065A Granted JPS57136254A (en) 1981-02-16 1981-02-16 Arithmetic processor

Country Status (1)

Country Link
JP (1) JPS57136254A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6123232A (en) * 1984-07-11 1986-01-31 Nec Corp Arithmetic unit
JPS63245525A (en) * 1987-03-31 1988-10-12 Toshiba Corp Microprogram processor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6123232A (en) * 1984-07-11 1986-01-31 Nec Corp Arithmetic unit
JPS63245525A (en) * 1987-03-31 1988-10-12 Toshiba Corp Microprogram processor

Also Published As

Publication number Publication date
JPS6244657B2 (en) 1987-09-22

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