JPS5668831A - Decoding circuit - Google Patents
Decoding circuitInfo
- Publication number
- JPS5668831A JPS5668831A JP14521179A JP14521179A JPS5668831A JP S5668831 A JPS5668831 A JP S5668831A JP 14521179 A JP14521179 A JP 14521179A JP 14521179 A JP14521179 A JP 14521179A JP S5668831 A JPS5668831 A JP S5668831A
- Authority
- JP
- Japan
- Prior art keywords
- decoder
- types
- decoding
- decoders
- instruction
- 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
Landscapes
- Executing Machine-Instructions (AREA)
Abstract
PURPOSE: To obtain the decoding output signals of 2n+1 types or more out of the input signals of (n) bits, by actuating selectively one of the (m) units of decoders according to the state of the FF in the instruction decoding circuit of a microprocessor or the like.
CONSTITUTION: The 1st decoder 2a is put under the active state, and the 2nd decoder 2b is put under the inactive state respectively. Thus the instruction code to be supplied is decoded at the decoder 2a, and the decoding signal corresponding to the instruction code is delivered from the output end. When the decoder 2b is actuated, the instruction codes to be subsequently supplied are decoded by the decoder 2b to deliver the output signal corresponding to the instruction code through the output end. In this case, the outputs of 2×(2n-1) types in all are obtained from the decoders 2a and 2b by 2n-1 types each. And in general, the decoding output signals of 2n+1 types or more can be obtained from the input signals of (n) bits in the case of decoders of (m) units.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14521179A JPS5668831A (en) | 1979-11-08 | 1979-11-08 | Decoding circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14521179A JPS5668831A (en) | 1979-11-08 | 1979-11-08 | Decoding circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5668831A true JPS5668831A (en) | 1981-06-09 |
Family
ID=15379941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14521179A Pending JPS5668831A (en) | 1979-11-08 | 1979-11-08 | Decoding circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5668831A (en) |
-
1979
- 1979-11-08 JP JP14521179A patent/JPS5668831A/en active Pending
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