Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Dadda_multiplier> ?p ?o. }
Showing items 1 to 28 of
28
with 100 items per page.
- Dadda_multiplier abstract "The Dadda multiplier is a hardware multiplier design invented by computer scientist Luigi Dadda in 1965. It is similar to the Wallace multiplier, but it is slightly faster (for all operand sizes) and requires fewer gates (for all but the smallest operand sizes).[1]In fact, Dadda and Wallace multipliers have the same three steps: Multiply (logical AND) each bit of one of the arguments, by each bit of the other, yielding results. Depending on position of the multiplied bits, the wires carry different weights, for example wire of bit carrying result of is 32. Reduce the number of partial products to two layers of full and half adders. Group the wires in two numbers, and add them with a conventional adder.However, unlike Wallace multipliers that reduce as much as possible on each layer, Dadda multipliers do as few reductions as possible. Because of this, Dadda multipliers have a less expensive reduction phase, but the numbers may be a few bits longer, thus requiring slightly bigger adders.To achieve this, the structure of the second step is governed by slightly more complex rules than in the Wallace tree. As in the Wallace tree, a new layer is added if any weight is carried by three or more wires. The reduction rules for the Dadda tree, however, are as follows: Take any three wires with the same weights and input them into a full adder. The result will be an output wire of the same weight and an output wire with a higher weight for each three input wires. If there are two wires of the same weight left, and the current number of output wires with that weight is equal to 2 (modulo 3), input them into a half adder. Otherwise, pass them through to the next layer. If there is just one wire left, connect it to the next layer.This step does only as many adds as necessary, so that the number of output weights stays close to a multiple of 3, which is the ideal number of weights when using full adders as 3:2 compressors.However, when a layer carries at most three input wires for any weight, that layer will be the last one. In this case, the Dadda tree will use half adder more aggressively (but still not as much as in a Wallace multiplier), to ensure that there are only two outputs for any weight. Then, the second rule above changes as follows: If there are two wires of the same weight left, and the current number of output wires with that weight is equal to 1 or 2 (modulo 3), input them into a half adder. Otherwise, pass them through to the next layer.".
- Dadda_multiplier thumbnail Hindu_lattice_2.svg?width=300.
- Dadda_multiplier wikiPageExternalLink spie03.pdf.
- Dadda_multiplier wikiPageID "4181062".
- Dadda_multiplier wikiPageRevisionID "596361795".
- Dadda_multiplier hasPhotoCollection Dadda_multiplier.
- Dadda_multiplier subject Category:Computer_arithmetic.
- Dadda_multiplier subject Category:Digital_circuits.
- Dadda_multiplier type Artifact100021939.
- Dadda_multiplier type Circuit103033362.
- Dadda_multiplier type Device103183080.
- Dadda_multiplier type DigitalCircuits.
- Dadda_multiplier type ElectricalDevice103269401.
- Dadda_multiplier type Instrumentality103575240.
- Dadda_multiplier type Object100002684.
- Dadda_multiplier type PhysicalEntity100001930.
- Dadda_multiplier type Whole100003553.
- Dadda_multiplier comment "The Dadda multiplier is a hardware multiplier design invented by computer scientist Luigi Dadda in 1965. It is similar to the Wallace multiplier, but it is slightly faster (for all operand sizes) and requires fewer gates (for all but the smallest operand sizes).[1]In fact, Dadda and Wallace multipliers have the same three steps: Multiply (logical AND) each bit of one of the arguments, by each bit of the other, yielding results.".
- Dadda_multiplier label "Dadda multiplier".
- Dadda_multiplier label "Dadda-Tree-Multiplizierer".
- Dadda_multiplier sameAs Dadda-Tree-Multiplizierer.
- Dadda_multiplier sameAs m.0bnkzd.
- Dadda_multiplier sameAs Q5207932.
- Dadda_multiplier sameAs Q5207932.
- Dadda_multiplier sameAs Dadda_multiplier.
- Dadda_multiplier wasDerivedFrom Dadda_multiplier?oldid=596361795.
- Dadda_multiplier depiction Hindu_lattice_2.svg.
- Dadda_multiplier isPrimaryTopicOf Dadda_multiplier.
