JPS56129947A - Microprogram controller - Google Patents

Microprogram controller

Info

Publication number
JPS56129947A
JPS56129947A JP3427480A JP3427480A JPS56129947A JP S56129947 A JPS56129947 A JP S56129947A JP 3427480 A JP3427480 A JP 3427480A JP 3427480 A JP3427480 A JP 3427480A JP S56129947 A JPS56129947 A JP S56129947A
Authority
JP
Japan
Prior art keywords
address
write
control memory
readout
memory
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.)
Granted
Application number
JP3427480A
Other languages
Japanese (ja)
Other versions
JPS6141422B2 (en
Inventor
Yoshiharu Ono
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP3427480A priority Critical patent/JPS56129947A/en
Publication of JPS56129947A publication Critical patent/JPS56129947A/en
Publication of JPS6141422B2 publication Critical patent/JPS6141422B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/22—Microcontrol or microprogram arrangements
    • G06F9/26—Address formation of the next micro-instruction ; Microprogram storage or retrieval arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Software Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Storage Device Security (AREA)

Abstract

PURPOSE:To enable the protection of resident area with a small amount of hardware, by blocking the transfer of content of address of write-in when the read-in address is smaller than the readout address so that the write-in to the control memory is not made. CONSTITUTION:In the data processor, when the microprogram routine not stored in the control memory 1 is required, the microprogam is branched to the overlay managing routine and picked up from the external memory 12, and the write-in address set to the write-in address register 9 and the readout address of the control memory 1 producing the write-in instruction signal are compared at a comparison circuit 10. If the write-in address is greater than the readout address, the control circuit 11 transfers the content of the write-in address and writes in the control memory 1. If the write-in address is smaller than the readout address, the transfer is blocked and no write-in to the control memory 1 is made.
JP3427480A 1980-03-17 1980-03-17 Microprogram controller Granted JPS56129947A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3427480A JPS56129947A (en) 1980-03-17 1980-03-17 Microprogram controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3427480A JPS56129947A (en) 1980-03-17 1980-03-17 Microprogram controller

Publications (2)

Publication Number Publication Date
JPS56129947A true JPS56129947A (en) 1981-10-12
JPS6141422B2 JPS6141422B2 (en) 1986-09-16

Family

ID=12409577

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3427480A Granted JPS56129947A (en) 1980-03-17 1980-03-17 Microprogram controller

Country Status (1)

Country Link
JP (1) JPS56129947A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5963097A (en) * 1982-09-30 1984-04-10 Panafacom Ltd Memory protection system using address comparison
JPS6137540U (en) * 1984-08-08 1986-03-08 日本電気株式会社 Memory with memory protection function
JPH01197867A (en) * 1988-02-02 1989-08-09 Ibiden Co Ltd Multi-processor system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5963097A (en) * 1982-09-30 1984-04-10 Panafacom Ltd Memory protection system using address comparison
JPS6220583B2 (en) * 1982-09-30 1987-05-07 Panafacom Ltd
JPS6137540U (en) * 1984-08-08 1986-03-08 日本電気株式会社 Memory with memory protection function
JPH01197867A (en) * 1988-02-02 1989-08-09 Ibiden Co Ltd Multi-processor system

Also Published As

Publication number Publication date
JPS6141422B2 (en) 1986-09-16

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