JPS556633A - Memory access control system - Google Patents

Memory access control system

Info

Publication number
JPS556633A
JPS556633A JP7905378A JP7905378A JPS556633A JP S556633 A JPS556633 A JP S556633A JP 7905378 A JP7905378 A JP 7905378A JP 7905378 A JP7905378 A JP 7905378A JP S556633 A JPS556633 A JP S556633A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
main memory
memory
block
cm
directory
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
JP7905378A
Inventor
Tadao Kondo
Original Assignee
Nec 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

Links

Abstract

PURPOSE: To improve system performance by allowing a processor, not in charge, to set the lock bit of a corresponding block in a directory during the exclusive access period of a main memory and by locking the main memory, block by block in a cash memory.
CONSTITUTION: Processor CPU1 holds the address and effectiveness display bit of information read out to cash memory unit CM1 corresponding to blocks of memory CM1, and sldo has the lock bit indicating that the blocks have been locked in directory DR1. While the other processor CPU2 is inhibited from attaining access to main memory MM during the exclusive access execution period of the main memory, the lock bits of a corresponding block in directory DR1 is set and the locking of the main memory to inhibit CPU2 from attaining access to main memory MM is done on the unit of the block of memory CM1. Consequently, the performance of the system can be improved.
COPYRIGHT: (C)1980,JPO&Japio
JP7905378A 1978-06-29 1978-06-29 Memory access control system Pending JPS556633A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7905378A JPS556633A (en) 1978-06-29 1978-06-29 Memory access control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7905378A JPS556633A (en) 1978-06-29 1978-06-29 Memory access control system

Publications (1)

Publication Number Publication Date
JPS556633A true true JPS556633A (en) 1980-01-18

Family

ID=13679145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7905378A Pending JPS556633A (en) 1978-06-29 1978-06-29 Memory access control system

Country Status (1)

Country Link
JP (1) JPS556633A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246852A (en) * 1985-02-05 1986-11-04 Digital Equipment Corp Data processing system
JPH04230550A (en) * 1990-10-12 1992-08-19 Internatl Business Mach Corp <Ibm> Information processing network and information processing method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61246852A (en) * 1985-02-05 1986-11-04 Digital Equipment Corp Data processing system
JPH04230550A (en) * 1990-10-12 1992-08-19 Internatl Business Mach Corp <Ibm> Information processing network and information processing method
US5339397A (en) * 1990-10-12 1994-08-16 International Business Machines Corporation Hardware primary directory lock

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