[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

JPS5595160A - Memory control system - Google Patents

Memory control system

Info

Publication number
JPS5595160A
JPS5595160A JP69079A JP69079A JPS5595160A JP S5595160 A JPS5595160 A JP S5595160A JP 69079 A JP69079 A JP 69079A JP 69079 A JP69079 A JP 69079A JP S5595160 A JPS5595160 A JP S5595160A
Authority
JP
Japan
Prior art keywords
memory
extended
signal
bit
access
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
JP69079A
Other languages
Japanese (ja)
Inventor
Yoshihiro Miyazaki
Toshiyuki Ide
Atomi Noguchi
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP69079A priority Critical patent/JPS5595160A/en
Publication of JPS5595160A publication Critical patent/JPS5595160A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make it possible to extend easily a memory by providing an extended memory similar to a main memory and then by giving an instruction word a memory selecting bit.
CONSTITUTION: With specific bit 16 in instruction word 15 ON, turning instruction execution timing signal 17 ON during the execution of an instruction turns ON extended-memory bit effective signal 18. Therefore, main memory selecting signal 8 is OFF and extended-memory selective signal 9 ON. With memory start signal 12 ON, extended-memory start signal 6 turns ON to attain access to an extended memory. Further, when access to the extended memory is indicated by a memory selecting bit, the memory controller is equipped with a memory selection register to provide access to one of several extended memories.
COPYRIGHT: (C)1980,JPO&Japio
JP69079A 1979-01-10 1979-01-10 Memory control system Pending JPS5595160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP69079A JPS5595160A (en) 1979-01-10 1979-01-10 Memory control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP69079A JPS5595160A (en) 1979-01-10 1979-01-10 Memory control system

Publications (1)

Publication Number Publication Date
JPS5595160A true JPS5595160A (en) 1980-07-19

Family

ID=11480745

Family Applications (1)

Application Number Title Priority Date Filing Date
JP69079A Pending JPS5595160A (en) 1979-01-10 1979-01-10 Memory control system

Country Status (1)

Country Link
JP (1) JPS5595160A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61190648A (en) * 1985-02-19 1986-08-25 Ando Electric Co Ltd Inter-memory data transfer control circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112547A (en) * 1973-02-06 1974-10-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49112547A (en) * 1973-02-06 1974-10-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61190648A (en) * 1985-02-19 1986-08-25 Ando Electric Co Ltd Inter-memory data transfer control circuit

Similar Documents

Publication Publication Date Title
JPS5248440A (en) Memory access control system
JPS5727477A (en) Memory circuit
JPS51141537A (en) Memory access control device
JPS51118341A (en) Shift register type memory
JPS54117640A (en) Memory address designation system
JPS5595160A (en) Memory control system
JPS5694451A (en) Microprocessor incorporating memory
JPS5693162A (en) Read/write control circuit of random access memory
JPS5429940A (en) Microprocessor controller
JPS5326632A (en) Common memory control unit
JPS5330841A (en) Control method of computer
JPS5616980A (en) Write-in system of one-bit of memory
JPS5393735A (en) Memory control system
JPS5394835A (en) Memory unit
JPS5687142A (en) Sequence control system for rom address
JPS5277548A (en) Micro program address control system
JPS5515526A (en) Microprogram control circuit
JPS55105751A (en) Microprogram control unit
JPS52101938A (en) Microprogram control device
JPS54142025A (en) Address system
JPS56147245A (en) Microprogram control device
JPS5249741A (en) Microprogram control unit
JPS53106527A (en) Common memory unit
JPS5561864A (en) Hold control system for address comparison register
JPS5337337A (en) Refresh control system for memory unit