JPS5518706A - Parallel adder circuit - Google Patents

Parallel adder circuit

Info

Publication number
JPS5518706A
JPS5518706A JP8947378A JP8947378A JPS5518706A JP S5518706 A JPS5518706 A JP S5518706A JP 8947378 A JP8947378 A JP 8947378A JP 8947378 A JP8947378 A JP 8947378A JP S5518706 A JPS5518706 A JP S5518706A
Authority
JP
Japan
Prior art keywords
signal
transfer elements
signal transfer
carry
half adders
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
Application number
JP8947378A
Other languages
Japanese (ja)
Inventor
Takehiko Nishida
Hideo Maejima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP8947378A priority Critical patent/JPS5518706A/en
Publication of JPS5518706A publication Critical patent/JPS5518706A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To reduce greatly the total number of elements without changing an adding speed by using signal transfer elements, whose switching operation are controlled by outputs of half adders for respective digits, as carry transfer elements and then by connecting all of them in series.
CONSTITUTION: For respective digits, logical gates 1a to 1d and half adders 2a to 2d are provided, and signal transfer elements 11a to 11d controlled by the half adders are connected in series. Further, carry-signal generating tansistors 12a to 12d and 15a to 15d are connected between respective signal transfer elements for corresponding digits and post-stage signal transfer elements. In addition, signal transfer circuit 16 which operates where there is no carry signal from the prior digit of the lowest digit and circuit 17 which operates when there is the signal are provided. The output of an addition result is outputted from OR-ELSE gate 19d to 19a in the former case and from gate 20a to 20d in the latter case. Therefore, the adding speed will not be reduced.
COPYRIGHT: (C)1980,JPO&Japio
JP8947378A 1978-07-24 1978-07-24 Parallel adder circuit Pending JPS5518706A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8947378A JPS5518706A (en) 1978-07-24 1978-07-24 Parallel adder circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8947378A JPS5518706A (en) 1978-07-24 1978-07-24 Parallel adder circuit

Publications (1)

Publication Number Publication Date
JPS5518706A true JPS5518706A (en) 1980-02-09

Family

ID=13971686

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8947378A Pending JPS5518706A (en) 1978-07-24 1978-07-24 Parallel adder circuit

Country Status (1)

Country Link
JP (1) JPS5518706A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752945A (en) * 1980-08-04 1982-03-29 Western Electric Co Carry circuit
JPH02301827A (en) * 1989-04-28 1990-12-13 Internatl Business Mach Corp <Ibm> Logic synthesization network
JPH08251008A (en) * 1996-03-15 1996-09-27 Hitachi Ltd Complex logic circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52140241A (en) * 1976-05-18 1977-11-22 Nippon Telegr & Teleph Corp <Ntt> Binary #-digit addition circuit
JPS52152132A (en) * 1976-06-14 1977-12-17 Matsushita Electric Ind Co Ltd Carry siganl generator circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52140241A (en) * 1976-05-18 1977-11-22 Nippon Telegr & Teleph Corp <Ntt> Binary #-digit addition circuit
JPS52152132A (en) * 1976-06-14 1977-12-17 Matsushita Electric Ind Co Ltd Carry siganl generator circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5752945A (en) * 1980-08-04 1982-03-29 Western Electric Co Carry circuit
JPH02301827A (en) * 1989-04-28 1990-12-13 Internatl Business Mach Corp <Ibm> Logic synthesization network
JPH08251008A (en) * 1996-03-15 1996-09-27 Hitachi Ltd Complex logic circuit

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