JPS6419432A - Predictive carrying circuit - Google Patents
Predictive carrying circuitInfo
- Publication number
- JPS6419432A JPS6419432A JP17487287A JP17487287A JPS6419432A JP S6419432 A JPS6419432 A JP S6419432A JP 17487287 A JP17487287 A JP 17487287A JP 17487287 A JP17487287 A JP 17487287A JP S6419432 A JPS6419432 A JP S6419432A
- Authority
- JP
- Japan
- Prior art keywords
- carrying
- predictive
- circuit
- bit
- bits
- 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 enable the predictive carrying of a prescribed number of bits and predictive carrying of its integer multiple length, superposed by the prescribed number of bits, without extending the circuit scale so much by providing a second specific predictive carrying circuit which carries an integer-multiple length of carry of a first unit predictive carrying circuit. CONSTITUTION:The first unit predictive carrying circuit consists of four bits. When carrying occurs throughout four-bit full adders AD4-AD7 and carrying occurs even in the predictive carrying circuit for low-order four-bit full adders AD0-AD3, AND between potentials of lines l6 and l52 inputted to transistors T13 and T14 is operated to constitute the second predictive carrying circuit, and its output is used as the output of 8-bit predictive carrying. The similar circuit is repeatedly constituted at every four-bit full adder group to enable four-bit predictive carrying and eight-bit predictive carrying superposed by every four-bit with each other and it is unnecessary to extend the circuit scale so much.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17487287A JPS6419432A (en) | 1987-07-15 | 1987-07-15 | Predictive carrying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17487287A JPS6419432A (en) | 1987-07-15 | 1987-07-15 | Predictive carrying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6419432A true JPS6419432A (en) | 1989-01-23 |
Family
ID=15986133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17487287A Pending JPS6419432A (en) | 1987-07-15 | 1987-07-15 | Predictive carrying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6419432A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60134932A (en) * | 1983-12-24 | 1985-07-18 | Toshiba Corp | Carry chaining addition circuit of precharge type |
| JPS62144241A (en) * | 1985-12-18 | 1987-06-27 | Mitsubishi Electric Corp | Adding circuit |
-
1987
- 1987-07-15 JP JP17487287A patent/JPS6419432A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60134932A (en) * | 1983-12-24 | 1985-07-18 | Toshiba Corp | Carry chaining addition circuit of precharge type |
| JPS62144241A (en) * | 1985-12-18 | 1987-06-27 | Mitsubishi Electric Corp | Adding circuit |
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