JPS5674749A - Microprogram controlling device - Google Patents
Microprogram controlling deviceInfo
- 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
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
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)
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)
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 |
-
1979
- 1979-11-26 JP JP15266479A patent/JPS5674749A/en active Pending
Patent Citations (2)
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)
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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