JPS5676820A - Memory control unit - Google Patents

Memory control unit

Info

Publication number
JPS5676820A
JPS5676820A JP15485179A JP15485179A JPS5676820A JP S5676820 A JPS5676820 A JP S5676820A JP 15485179 A JP15485179 A JP 15485179A JP 15485179 A JP15485179 A JP 15485179A JP S5676820 A JPS5676820 A JP S5676820A
Authority
JP
Japan
Prior art keywords
ram
signal
cpu
breakdown
slope
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
JP15485179A
Other languages
Japanese (ja)
Inventor
Minoru Machida
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP15485179A priority Critical patent/JPS5676820A/en
Publication of JPS5676820A publication Critical patent/JPS5676820A/en
Pending legal-status Critical Current

Links

Landscapes

  • Techniques For Improving Reliability Of Storages (AREA)
  • Direct Current Feeding And Distribution (AREA)
  • Power Sources (AREA)

Abstract

PURPOSE: To avoid the breakdown of the memory information caused by the malfunction during the unsteady operation of the CPU, by detecting the slope of the main power source having the slow rise and fall and then using this detected signal for the control signal.
CONSTITUTION: The address terminals A0WA9 plus the data terminals D0WD3 of the CPU are connected to the RAM, and the data is stored into the RAM. The CMOSGATE which gates the output given from the Schmitt trigger circuit ST as well as the mode signal/write signal SR/W is connected to the RAM, and the signal is supplied to the R/W terminal of the RAM from the GATE. Then the trigger circuit ST detects the slope of the main power source having the slow rise and fall of the output VMP, and the signal detected by the circuit ST is applied to the GATE in the form of the control signal. Then the R/W terminal is set forcubly at H level, thus preventing the breakdown of the memory information of the RAM which is caused by the malfunction during the unsteady period of the CPU.
COPYRIGHT: (C)1981,JPO&Japio
JP15485179A 1979-11-28 1979-11-28 Memory control unit Pending JPS5676820A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15485179A JPS5676820A (en) 1979-11-28 1979-11-28 Memory control unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15485179A JPS5676820A (en) 1979-11-28 1979-11-28 Memory control unit

Publications (1)

Publication Number Publication Date
JPS5676820A true JPS5676820A (en) 1981-06-24

Family

ID=15593282

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15485179A Pending JPS5676820A (en) 1979-11-28 1979-11-28 Memory control unit

Country Status (1)

Country Link
JP (1) JPS5676820A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61170846A (en) * 1985-01-25 1986-08-01 Oki Electric Ind Co Ltd Store protecting circuit of memory element

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61170846A (en) * 1985-01-25 1986-08-01 Oki Electric Ind Co Ltd Store protecting circuit of memory element

Similar Documents

Publication Publication Date Title
JPS573164A (en) Microcomputer control device
JPS54152931A (en) Semiconductor memory device
KR900015154A (en) Di-RAM integrated semiconductor memory and its test method
JPS57103195A (en) Semiconductor storage device
JPS5599522A (en) Combustion controller
JPS5517869A (en) Semiconductor memory device
JPS5733493A (en) Semiconductor storage device
JPS5676820A (en) Memory control unit
JPS5562589A (en) Semiconductor memory circuit
JPS5313842A (en) Magnetic bubble unit of start stop type
JPS5423337A (en) Semiconductor memory unit
JPS54106134A (en) Data protection circuit for semiconductor memory device
JPS5451334A (en) Protector for memeory content of data memory device
JPS5456748A (en) Writing circuit for analog memory
JPS57100687A (en) Semiconductor memory
JPS57167196A (en) Memory circuit
JPS5567994A (en) Data processor
JPS5325321A (en) Reading controller for memory unit
JPS52156526A (en) Controller of externally connected arithmetic circuit
JPS5528504A (en) Protective circuit for memory device
JPS5379329A (en) Test method of memory circuit
JPS5651679A (en) Measuring circuit for minimum operation pulse
JPS5422133A (en) Memory circuit device
JPS53145431A (en) Test method for memory
JPS5512541A (en) Compensation system for open wire