JPS6476221A - Logical operating circuit - Google Patents
Logical operating circuitInfo
- Publication number
- JPS6476221A JPS6476221A JP23395987A JP23395987A JPS6476221A JP S6476221 A JPS6476221 A JP S6476221A JP 23395987 A JP23395987 A JP 23395987A JP 23395987 A JP23395987 A JP 23395987A JP S6476221 A JPS6476221 A JP S6476221A
- Authority
- JP
- Japan
- Prior art keywords
- carry
- circuits
- generating
- functions
- outputs
- 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 shorten the transmission delay time of a carry signal in an arithmetic and logic operating unit, etc., and to cause the operating speed to be high by providing plural adding circuits, first, second and third carry generating circuits and an output selecting circuit. CONSTITUTION:Carry generating functions G3-G15 of adding circuits ADD 0-ADD3 outputs and carry propagating functions P3-P15 are supplied to a carry generating circuit CGO (the first carry generating circuit). Carry generating functions G19-G31 of adding circuits Add4-Add7 outputs and carry propagating functions P19-P31 are supplied to carry generating circuits CG11 and 12 (the second and third carry generating circuits. The carry signals to be supplied to a carry input terminal C of the circuits CG11 and 12 are respectively fixed to logic 1 and 0. Next, the carry signals of the circuits CG11 and 12 outputs are inputted to an output selecting circuit SEL and selectively transmitted according to the carry signal outputted from the carry generating circuit of a low order. Then, the transmission delay time of the carry signal is shortened and the operating speed can be made high.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23395987A JPS6476221A (en) | 1987-09-18 | 1987-09-18 | Logical operating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23395987A JPS6476221A (en) | 1987-09-18 | 1987-09-18 | Logical operating circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6476221A true JPS6476221A (en) | 1989-03-22 |
Family
ID=16963308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23395987A Pending JPS6476221A (en) | 1987-09-18 | 1987-09-18 | Logical operating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6476221A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03150630A (en) * | 1989-11-08 | 1991-06-27 | Matsushita Electric Ind Co Ltd | Look ahead carry generating circuit |
KR100520591B1 (en) * | 1996-10-29 | 2006-01-27 | 마츠시타 덴끼 산교 가부시키가이샤 | Adder circuit and associated layout structure |
US20150087856A1 (en) * | 2012-04-02 | 2015-03-26 | Takasago International Corporation | Melanin production inhibitor |
-
1987
- 1987-09-18 JP JP23395987A patent/JPS6476221A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03150630A (en) * | 1989-11-08 | 1991-06-27 | Matsushita Electric Ind Co Ltd | Look ahead carry generating circuit |
KR100520591B1 (en) * | 1996-10-29 | 2006-01-27 | 마츠시타 덴끼 산교 가부시키가이샤 | Adder circuit and associated layout structure |
US20150087856A1 (en) * | 2012-04-02 | 2015-03-26 | Takasago International Corporation | Melanin production inhibitor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES8304678A1 (en) | High reliability duplicated clock device. | |
JPS56147260A (en) | Lsi for digital signal processing | |
TW344030B (en) | Integrated circuit having Schmitt input circuits | |
JPS6476221A (en) | Logical operating circuit | |
TW257906B (en) | ECL differential multiplexing circuit | |
JPS5446463A (en) | Pre-scaler | |
JPS5685127A (en) | Digital signal processor | |
JPS57198593A (en) | Memory circuit | |
JPS6432647A (en) | Semiconductor integrated circuit device | |
JPS5572261A (en) | Logic unit | |
JPS6442720A (en) | Clock generating circuit | |
JPS5698030A (en) | Odd dividing circuit | |
JPS56138328A (en) | Frequency multiplying circuit | |
JPS6486271A (en) | Accumulator | |
JPS57116431A (en) | Programmable logic array | |
JPS56137748A (en) | Mutliplexing circuit | |
JPS6412331A (en) | Arithmetic circuit | |
JPS5761326A (en) | Double frequency generating circuit | |
JPS5497301A (en) | Signal transmission system | |
JPS57201936A (en) | Integrated logical circuit | |
JPS6426992A (en) | Function generating circuit | |
JPS6441516A (en) | Latch circuit | |
JPS56106451A (en) | Multiplication/isolation circuit | |
JPS6410391A (en) | Condition change detecting device | |
JPS5447450A (en) | Arthmetic circuit |