JPS57106956A - Microprogram control system - Google Patents

Microprogram control system

Info

Publication number
JPS57106956A
JPS57106956A JP55183071A JP18307180A JPS57106956A JP S57106956 A JPS57106956 A JP S57106956A JP 55183071 A JP55183071 A JP 55183071A JP 18307180 A JP18307180 A JP 18307180A JP S57106956 A JPS57106956 A JP S57106956A
Authority
JP
Japan
Prior art keywords
memories
basic instruction
instruction memory
control bus
microprogram
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
JP55183071A
Other languages
Japanese (ja)
Other versions
JPS6135577B2 (en
Inventor
Toshio Goto
Yoshio Asaji
Naoki Koizumi
Hirobumi Tatsuta
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.)
Panafacom Ltd
Original Assignee
Panafacom 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 Panafacom Ltd filed Critical Panafacom Ltd
Priority to JP55183071A priority Critical patent/JPS57106956A/en
Publication of JPS57106956A publication Critical patent/JPS57106956A/en
Publication of JPS6135577B2 publication Critical patent/JPS6135577B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06F9/223—Execution means for microinstructions irrespective of the microinstruction function, e.g. decoding of microinstructions and nanoinstructions; timing of microinstructions; programmable logic arrays; delays and fan-out problems

Landscapes

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

Abstract

PURPOSE:To improve the reliability of operation by preveting a system from being shut down by disconnecting a basic instruction memory, stored with a microprogram important to control over a CPU, from a control bus, and by reading instructions through the switching of a multiplexer. CONSTITUTION:A discriminating circuit 5 connected to an address bus 1 discriminates an address to select a basic instruction memory Mc and other memories M1'-M3' by a multiplexer 4. Those memories Mc, and M1'-M3', when their own addresses are selected, open gates to read a microprogram in a microinstruction execution register 3. The basic instruction memory Mc is disconnected from a control bus 2 to which other memories M1'-M3' are connected, so the memory Mc is readable even if an error occurs on the control bus 2, so that the system is prevented from being shut down.
JP55183071A 1980-12-24 1980-12-24 Microprogram control system Granted JPS57106956A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55183071A JPS57106956A (en) 1980-12-24 1980-12-24 Microprogram control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55183071A JPS57106956A (en) 1980-12-24 1980-12-24 Microprogram control system

Publications (2)

Publication Number Publication Date
JPS57106956A true JPS57106956A (en) 1982-07-03
JPS6135577B2 JPS6135577B2 (en) 1986-08-13

Family

ID=16129234

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55183071A Granted JPS57106956A (en) 1980-12-24 1980-12-24 Microprogram control system

Country Status (1)

Country Link
JP (1) JPS57106956A (en)

Also Published As

Publication number Publication date
JPS6135577B2 (en) 1986-08-13

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