JPS5694580A - Direct memory access control device - Google Patents

Direct memory access control device

Info

Publication number
JPS5694580A
JPS5694580A JP17303479A JP17303479A JPS5694580A JP S5694580 A JPS5694580 A JP S5694580A JP 17303479 A JP17303479 A JP 17303479A JP 17303479 A JP17303479 A JP 17303479A JP S5694580 A JPS5694580 A JP S5694580A
Authority
JP
Japan
Prior art keywords
memory access
direct memory
refresh
produced
access control
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
JP17303479A
Other languages
Japanese (ja)
Inventor
Yasutaka Hirozawa
Osamu Araya
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 JP17303479A priority Critical patent/JPS5694580A/en
Publication of JPS5694580A publication Critical patent/JPS5694580A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C11/00—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/21—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements
    • G11C11/34—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices
    • G11C11/40—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors
    • G11C11/401—Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using electric elements using semiconductor devices using transistors forming cells needing refreshing or charge regeneration, i.e. dynamic cells
    • G11C11/406—Management or control of the refreshing or charge-regeneration cycles

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)

Abstract

PURPOSE:To prevent competition between direct memory access control and refresh control, by controlling the refresh operation of dynamic type memory independently from the direct memory access control. CONSTITUTION:When direct memory access request DMA is produced, the refresh operation preparating signal RRD earlier in timing than the refresh start signal RFS is produced from the refresh counter RFC. Further, when the direct memory access request signal DMA is produced, the refresh operation preparation signal RRD is produced in advance, and if the refresh start signal RFS is not produced, the direct memory access request is kept waited for some time. Thus, since the competition between the refresh operation and the direct memory access operation can be prevented, the data in memories can not improperly be converted or refreshed, allowing to increase the reliability.
JP17303479A 1979-12-27 1979-12-27 Direct memory access control device Pending JPS5694580A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17303479A JPS5694580A (en) 1979-12-27 1979-12-27 Direct memory access control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17303479A JPS5694580A (en) 1979-12-27 1979-12-27 Direct memory access control device

Publications (1)

Publication Number Publication Date
JPS5694580A true JPS5694580A (en) 1981-07-31

Family

ID=15952963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17303479A Pending JPS5694580A (en) 1979-12-27 1979-12-27 Direct memory access control device

Country Status (1)

Country Link
JP (1) JPS5694580A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116830A (en) * 1982-12-24 1984-07-05 Hitachi Micro Comput Eng Ltd Microcomputer system
EP0153469A2 (en) * 1984-02-27 1985-09-04 International Business Machines Corporation Refresh generator system for a dynamic memory

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116830A (en) * 1982-12-24 1984-07-05 Hitachi Micro Comput Eng Ltd Microcomputer system
EP0153469A2 (en) * 1984-02-27 1985-09-04 International Business Machines Corporation Refresh generator system for a dynamic memory

Similar Documents

Publication Publication Date Title
JPS5282134A (en) Data display control system
EP0242879A3 (en) Data processor with wait control allowing high speed access
JPS5248441A (en) Memory system
JPS5694580A (en) Direct memory access control device
JPS53136924A (en) Control system for memory device
JPS5235537A (en) Mos memory unit
JPS51122383A (en) Semiconductor memory
JPS5345942A (en) Memory unit
JPS558630A (en) Clock control system
JPS5337337A (en) Refresh control system for memory unit
JPS6413658A (en) Dram access control device
JPS52131A (en) Main memory control system
JPS5354429A (en) Memory device
JPS5247334A (en) Memory control system
JPS5239326A (en) Control unit
JPS51134536A (en) Refresh system
JPS5254342A (en) Dynamic memory refreshing
JPS53101237A (en) Refresh control system
JPS52130535A (en) Refresh control system of memory unit
JPS5220733A (en) Data processing unit
JPS53120342A (en) Refreshing method of dynamic semiconductor memory device
JPS52110532A (en) Refresh control system
JPS5760588A (en) Memory controller
JPS5227230A (en) Refresh control system of dynamic mos memory
JPS5619588A (en) Refresh control system