JPS54129934A - Data access control system - Google Patents

Data access control system

Info

Publication number
JPS54129934A
JPS54129934A JP3791978A JP3791978A JPS54129934A JP S54129934 A JPS54129934 A JP S54129934A JP 3791978 A JP3791978 A JP 3791978A JP 3791978 A JP3791978 A JP 3791978A JP S54129934 A JPS54129934 A JP S54129934A
Authority
JP
Japan
Prior art keywords
access
register
length
memory
data
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
JP3791978A
Other languages
Japanese (ja)
Inventor
Hiroshi Takada
Masahiro Kuriyama
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 JP3791978A priority Critical patent/JPS54129934A/en
Publication of JPS54129934A publication Critical patent/JPS54129934A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/02—Addressing or allocation; Relocation
    • G06F12/04—Addressing variable-length words or parts of words

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Executing Machine-Instructions (AREA)

Abstract

PURPOSE:To improve performance of a microprogram muPG control computer by attaining access to memory twice when the length of data of the memory to which access should be attained surpasses bounder 11. CONSTITUTION:In the muPG controller equipped with main memory MM from and to which data are read and written on a boundary unit, address information is set into memory address register MAR1 and the data length for access and information on the access direction are both set into length register L5 and the DR register respectively and transmitted to MM, thereby attaining the 1st access. At the same time, check circuit 3 makes a check on whether or not the length exceeds the boundary; when exceeding, an over-boundary flag is set to register 4, the remaining data length is calculated by adder 6, and the memory address and length are updated, thereby attaining the 2nd access. In this case, the lower bits of the memory address information are set into OPBS register 12 and memory data register 8 is shifted through shift control 7.
JP3791978A 1978-03-31 1978-03-31 Data access control system Pending JPS54129934A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3791978A JPS54129934A (en) 1978-03-31 1978-03-31 Data access control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3791978A JPS54129934A (en) 1978-03-31 1978-03-31 Data access control system

Publications (1)

Publication Number Publication Date
JPS54129934A true JPS54129934A (en) 1979-10-08

Family

ID=12510944

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3791978A Pending JPS54129934A (en) 1978-03-31 1978-03-31 Data access control system

Country Status (1)

Country Link
JP (1) JPS54129934A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59123936A (en) * 1982-12-29 1984-07-17 Fujitsu Ltd Movement control system
JPH03266047A (en) * 1990-03-16 1991-11-27 Fujitsu Ltd Data write control system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59123936A (en) * 1982-12-29 1984-07-17 Fujitsu Ltd Movement control system
JPS6226728B2 (en) * 1982-12-29 1987-06-10 Fujitsu Ltd
JPH03266047A (en) * 1990-03-16 1991-11-27 Fujitsu Ltd Data write control system

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