JPS5647842A - Microprogram control system - Google Patents
Microprogram control systemInfo
- Publication number
- JPS5647842A JPS5647842A JP12421579A JP12421579A JPS5647842A JP S5647842 A JPS5647842 A JP S5647842A JP 12421579 A JP12421579 A JP 12421579A JP 12421579 A JP12421579 A JP 12421579A JP S5647842 A JPS5647842 A JP S5647842A
- Authority
- JP
- Japan
- Prior art keywords
- microprogram
- microinstruction
- start address
- control system
- derives
- 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 elevate a speed of processing, by performing the operation in parallel as to the operation which sets a microinstruction to the instruction register, and the operation which derives a start address of the above microprogram.
CONSTITUTION: A microinstruction from the main memory is set to the instruction register 30 through the data bus 29. When an interruption occurs, a code (for example, FF) which does not exist in the corresponding OP code is forcibly selected as an input of the mapping ROM34 by an offering signal 50, and a start address of the microprogram is set to the microprogram counter 35. Thus, the operation which sets a microinstruction to the register and that which derives a start address of the microprogram can be performed in parallel, and a speed of processing can be elevated.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12421579A JPS5647842A (en) | 1979-09-28 | 1979-09-28 | Microprogram control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12421579A JPS5647842A (en) | 1979-09-28 | 1979-09-28 | Microprogram control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5647842A true JPS5647842A (en) | 1981-04-30 |
Family
ID=14879835
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12421579A Pending JPS5647842A (en) | 1979-09-28 | 1979-09-28 | Microprogram control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5647842A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0333929A (en) * | 1989-03-10 | 1991-02-14 | Nec Corp | Microprogram controller |
-
1979
- 1979-09-28 JP JP12421579A patent/JPS5647842A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0333929A (en) * | 1989-03-10 | 1991-02-14 | Nec Corp | Microprogram controller |
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