GB1093230A - Improvements in or relating to microprogram control systems - Google Patents

Improvements in or relating to microprogram control systems

Info

Publication number
GB1093230A
GB1093230A GB43569/65A GB4356965A GB1093230A GB 1093230 A GB1093230 A GB 1093230A GB 43569/65 A GB43569/65 A GB 43569/65A GB 4356965 A GB4356965 A GB 4356965A GB 1093230 A GB1093230 A GB 1093230A
Authority
GB
United Kingdom
Prior art keywords
microinstruction
bits
branch
branch bits
address
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.)
Expired
Application number
GB43569/65A
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1093230A publication Critical patent/GB1093230A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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)
  • Executing Machine-Instructions (AREA)

Abstract

1,093,230. Microprogramming. INTERNATIONAL BUSINESS MACHINES CORPORATION. Oct. 14, 1965 [Dec. 18, 1964], No. 43569/65. Heading G4A. In a microprogramme control system, a combination of branch signals derived from a current microinstruction can be modified before use in selecting the next microinstruction to reduce the number of possibilities for the latter. A microinstruction selects two of a plurality of variable and constant branch bits to be converted under control of the microinstruction into two further branch bits which together with bits provided direct by the microinstruction constitute the address of the next microinstruction in a read-only store. The latter address may also depend on the current ordinary instruction. In the conversion logic shown, different pairs of initial branch bits can result in the same pair of further branch bits.
GB43569/65A 1964-12-18 1965-10-14 Improvements in or relating to microprogram control systems Expired GB1093230A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US419403A US3325785A (en) 1964-12-18 1964-12-18 Efficient utilization of control storage and access controls therefor

Publications (1)

Publication Number Publication Date
GB1093230A true GB1093230A (en) 1967-11-29

Family

ID=23662114

Family Applications (1)

Application Number Title Priority Date Filing Date
GB43569/65A Expired GB1093230A (en) 1964-12-18 1965-10-14 Improvements in or relating to microprogram control systems

Country Status (4)

Country Link
US (1) US3325785A (en)
DE (1) DE1262641B (en)
FR (1) FR1466423A (en)
GB (1) GB1093230A (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1250659B (en) * 1964-04-06 1967-09-21 International Business Machines Corporation, Armonk, NY (V St A) Microprogram-controlled data processing system
US3391394A (en) * 1965-10-22 1968-07-02 Ibm Microprogram control for a data processing system
US3626427A (en) * 1967-01-13 1971-12-07 Ibm Large-scale data processing system
US3573736A (en) * 1968-01-15 1971-04-06 Ibm Interruption and interlock arrangement
US3916387A (en) * 1971-04-23 1975-10-28 Ibm Directory searching method and means
US3728686A (en) * 1971-06-07 1973-04-17 Rca Corp Computer memory with improved next word accessing
US3704448A (en) * 1971-08-02 1972-11-28 Hewlett Packard Co Data processing control system
JPS54618B2 (en) * 1971-12-03 1979-01-12
US3760369A (en) * 1972-06-02 1973-09-18 Ibm Distributed microprogram control in an information handling system
US3794979A (en) * 1973-03-02 1974-02-26 Ibm Microprogrammed control unit with means for reversing and complementing microinstructions
US3958227A (en) * 1974-09-24 1976-05-18 International Business Machines Corporation Control store system with flexible control word selection
US4124893A (en) * 1976-10-18 1978-11-07 Honeywell Information Systems Inc. Microword address branching bit arrangement
US4860199A (en) * 1987-07-31 1989-08-22 Prime Computer, Inc. Hashing indexer for branch cache
US6184902B1 (en) 1997-04-30 2001-02-06 Hewlett-Packard Company Centralized branch intelligence system and method for a geometry accelerator
US5956047A (en) * 1997-04-30 1999-09-21 Hewlett-Packard Co. ROM-based control units in a geometry accelerator for a computer graphics system
US7127593B2 (en) * 2001-06-11 2006-10-24 Broadcom Corporation Conditional execution with multiple destination stores
US7861071B2 (en) * 2001-06-11 2010-12-28 Broadcom Corporation Conditional branch instruction capable of testing a plurality of indicators in a predicate register
US6986025B2 (en) * 2001-06-11 2006-01-10 Broadcom Corporation Conditional execution per lane

Also Published As

Publication number Publication date
DE1262641B (en) 1968-03-07
US3325785A (en) 1967-06-13
FR1466423A (en) 1967-01-20

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