JPS57199044A - Multiplying device - Google Patents

Multiplying device

Info

Publication number
JPS57199044A
JPS57199044A JP56085098A JP8509881A JPS57199044A JP S57199044 A JPS57199044 A JP S57199044A JP 56085098 A JP56085098 A JP 56085098A JP 8509881 A JP8509881 A JP 8509881A JP S57199044 A JPS57199044 A JP S57199044A
Authority
JP
Japan
Prior art keywords
circuit
adder
output
sum
addition
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
JP56085098A
Other languages
Japanese (ja)
Inventor
Satoshi Sugiura
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP56085098A priority Critical patent/JPS57199044A/en
Publication of JPS57199044A publication Critical patent/JPS57199044A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/38—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation
    • G06F7/48—Methods or arrangements for performing computations using exclusively denominational number representation, e.g. using binary, ternary, decimal representation using non-contact-making devices, e.g. tube, solid state device; using unspecified devices
    • G06F7/52—Multiplying; Dividing
    • G06F7/523—Multiplying only
    • G06F7/53—Multiplying only in parallel-parallel fashion, i.e. both operands being entered in parallel
    • G06F7/5324—Multiplying only in parallel-parallel fashion, i.e. both operands being entered in parallel partitioned, i.e. using repetitively a smaller parallel parallel multiplier or using an array of such smaller multipliers

Abstract

PURPOSE:To simplify a Wallace tree circuit to make the operation cycle high- speed, by inputting the carry and the sum of the Wallace tree circuit to an adder and adding them to the preceding output of the adder to obtain a product value and performing only the addition of partial products in the tree circuit. CONSTITUTION:A multiplier 12 and a multiplicand 10 are multiplied in a multiplying circuit 14, and an output A is applied to a Wallace tree circuit 16, and a carry output B' and a sum output C' from the circuit 16 are applied to an adder 26. A part F (lower 2 bits omitted) of the preceding addition output from a register 28 is inputted to the adder 26. The preceding output and the carry output B' and the sum output C' from the circuit 16 are added in the adder 26 to obtain a product value, and only the addition of partial products is performed in the circuit 26, and integral products and partial product results are adder in the adder 26, thus simplifying the circuit 16 to make the operation cycle high-speed.
JP56085098A 1981-06-03 1981-06-03 Multiplying device Pending JPS57199044A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56085098A JPS57199044A (en) 1981-06-03 1981-06-03 Multiplying device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56085098A JPS57199044A (en) 1981-06-03 1981-06-03 Multiplying device

Publications (1)

Publication Number Publication Date
JPS57199044A true JPS57199044A (en) 1982-12-06

Family

ID=13849129

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56085098A Pending JPS57199044A (en) 1981-06-03 1981-06-03 Multiplying device

Country Status (1)

Country Link
JP (1) JPS57199044A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60144826A (en) * 1984-01-05 1985-07-31 Nec Corp Arithmetic processor
US4852037A (en) * 1986-08-16 1989-07-25 Nec Corporation Arithmetic unit for carrying out both multiplication and addition in an interval for the multiplication
JPH0247769A (en) * 1988-08-09 1990-02-16 Matsushita Electric Ind Co Ltd Product sum arithmetic unit
US5138574A (en) * 1986-09-17 1992-08-11 Fujitsu Limited Method and device for obtaining sum of products using integrated circuit
JPH06110659A (en) * 1992-06-30 1994-04-22 Nec Corp Microcomputer
US7313585B2 (en) 2003-08-30 2007-12-25 Hewlett-Packard Development Company, L.P. Multiplier circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60144826A (en) * 1984-01-05 1985-07-31 Nec Corp Arithmetic processor
US4852037A (en) * 1986-08-16 1989-07-25 Nec Corporation Arithmetic unit for carrying out both multiplication and addition in an interval for the multiplication
US5138574A (en) * 1986-09-17 1992-08-11 Fujitsu Limited Method and device for obtaining sum of products using integrated circuit
JPH0247769A (en) * 1988-08-09 1990-02-16 Matsushita Electric Ind Co Ltd Product sum arithmetic unit
JPH06110659A (en) * 1992-06-30 1994-04-22 Nec Corp Microcomputer
US7313585B2 (en) 2003-08-30 2007-12-25 Hewlett-Packard Development Company, L.P. Multiplier circuit

Similar Documents

Publication Publication Date Title
JPS55103642A (en) Division unit
JPS57199044A (en) Multiplying device
JPS54159831A (en) Adder and subtractor for numbers different in data length using counter circuit
JPS5378742A (en) Multiplication control system
JPS576972A (en) Multiplying circuit of complex number
JPS5694435A (en) Multiplying circuit
JPS5520508A (en) Processor for division
JPS5663649A (en) Parallel multiplication apparatus
JPS56105540A (en) Adder
JPS5386539A (en) Arithmetic unit
JPS5725039A (en) Dividing circuit
JPS54159832A (en) Adder and subtractor for numbers different in data length
JPS6476162A (en) Arithmetic circuit for sum of products
GB1531470A (en) Circuit arrangement for adding and subtracting
JPS53103336A (en) Logic arithmetic circuit
JPS5741737A (en) Dividing device
JPS643734A (en) Multiplication circuit
JPS54132144A (en) Multiple process system
JPS54159833A (en) Decimal multiplier
JPS5785142A (en) Random number generating circuit
JPS6486270A (en) Sum of products operating circuit
JPS5378743A (en) Multiplier
JPS529337A (en) Small electronic computer
JPS5498544A (en) Multiplier for complex number
JPS5422140A (en) Digital differential analyzer