JPS5674749A - Microprogram controlling device - Google Patents

Microprogram controlling device

Info

Publication number
JPS5674749A
JPS5674749A JP15266479A JP15266479A JPS5674749A JP S5674749 A JPS5674749 A JP S5674749A JP 15266479 A JP15266479 A JP 15266479A JP 15266479 A JP15266479 A JP 15266479A JP S5674749 A JPS5674749 A JP S5674749A
Authority
JP
Japan
Prior art keywords
micro
instruction
register
decode mode
stored
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
JP15266479A
Other languages
Japanese (ja)
Inventor
Hiroyuki Wakita
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 JP15266479A priority Critical patent/JPS5674749A/en
Publication of JPS5674749A publication Critical patent/JPS5674749A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To economize the memory capacity of the control memory for storing the micro-instruction, by modifying the decoding result of the micro-instruction by means of the decode mode which has been added to the decode mode memory and has been stored at every block of the control memory.
CONSTITUTION: As for the microprogram, the micro-instruction is read out to the micro-instruction register 3 from the control memory by the (n) bit of the address stored in the micro-instruction address register 2. Also at the same time, the decode mode is read out to the decode mode register 6 from the decode mode memory by use of the high rank (a) bit of the address stored in the register 2. The decoder 4 decodes the micro-instruction stored in the micro-instruction register 3, and modifies the decode output prescribed by the decode mode which has been stored in the register 6.
COPYRIGHT: (C)1981,JPO&Japio
JP15266479A 1979-11-26 1979-11-26 Microprogram controlling device Pending JPS5674749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15266479A JPS5674749A (en) 1979-11-26 1979-11-26 Microprogram controlling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15266479A JPS5674749A (en) 1979-11-26 1979-11-26 Microprogram controlling device

Publications (1)

Publication Number Publication Date
JPS5674749A true JPS5674749A (en) 1981-06-20

Family

ID=15545381

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15266479A Pending JPS5674749A (en) 1979-11-26 1979-11-26 Microprogram controlling device

Country Status (1)

Country Link
JP (1) JPS5674749A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5969843A (en) * 1982-10-15 1984-04-20 Nec Corp Controlling method of microprogram
JPS6273333A (en) * 1985-09-26 1987-04-04 Nec Corp Emulation control system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5044752A (en) * 1973-08-23 1975-04-22
JPS5265637A (en) * 1975-11-28 1977-05-31 Hitachi Ltd Micro instruction control system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5044752A (en) * 1973-08-23 1975-04-22
JPS5265637A (en) * 1975-11-28 1977-05-31 Hitachi Ltd Micro instruction control system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5969843A (en) * 1982-10-15 1984-04-20 Nec Corp Controlling method of microprogram
JPH0115090B2 (en) * 1982-10-15 1989-03-15 Nippon Electric Co
JPS6273333A (en) * 1985-09-26 1987-04-04 Nec Corp Emulation control system
JPH0564375B2 (en) * 1985-09-26 1993-09-14 Nippon Electric Co

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