Apparatus and method for performing addition of PKG recoded numbers

a technology of pkg recoded numbers and apparatus, applied in the field of apparatus for performing arithmetic operations, can solve the problems of how to add numbers in this pkg recoded form, and the need for it has not yet been addressed, and achieve the effect of reducing noise production and power consumption

Inactive Publication Date: 2007-06-12
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]The present invention can also be viewed as providing a method for reducing noise production and power consumption by performing the addition of PKG recoded numbers. In this regard, the method can be broadly summarized by the following steps: (1) receiving a first value and second PKG value, and (2) generating a sum value and a carry value from the first value and second PKG value.

Problems solved by technology

While using PKG recoded signals can reduce the number of wires needed to represent two values, it does cause the problem of how to add numbers in this PKG recoded form.
Thus, a heretofore-unaddressed need exists in the industry to address the aforementioned deficiencies and inadequacies.

Method used

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Embodiment Construction

[0034]Reference will now be made in detail to the description of the invention as illustrated in the drawings. While the invention will be described in connection with these drawings, there is no intent to limit it to the embodiment or embodiments disclosed therein. On the contrary, the intent is to cover all alternatives, modifications, and equivalents included within the spirit and scope of the invention as defined by the appended claims.

[0035]Illustrated in FIG. 3A is a block diagram of a possible example of a carry save adder 100 redesigned for performing addition on a newly encoded Propagate-Kill-Generate (PKG) input and a traditional binary bit. A PKG input is provided by a PKG recoding operation that involves recoding logic values. As mentioned before, illustrated in FIG. 1 is a recoding table 2 illustrating the encoding of two logical values into mousetrap logic. The mousetrap logic values are then encoded into PKG recoding values to reduce the number of wires routed over an...

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PUM

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Abstract

An apparatus and method provide an apparatus and method for performing the addition of a PKG recoded number, to reduce noise production and power consumption. In particular, the apparatus is accomplished by a circuitry configured to receive at least two values, a first value and a second PKG value. The apparatus generates a sum value and a carry value. The method is accomplished by receiving a first value and second PKG value, and generating a sum value and a carry value from the first value and second PKG value.

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field[0002]The present invention generally relates to an apparatus for performing arithmetic operations, and more particularly, to reducing noise production and power consumption by performing the addition of PKG recoded numbers.[0003]2. Description of Related Art[0004]Generally, traditional dual-rail encoding (i.e. mousetrap logic) is often implemented in arithmetic circuitry. Dual-rail encoding requires that multiple wires be enabled to indicate the proper value. For power and noise reasons, it is desirable to reduce the number of wires routed over an integrated circuit and the switching activity of these wires. Therefore, PKG recoding can be implemented to reduce the number of wires and the switching activity of these wires.[0005]Illustrated in FIG. 1 is a recoding table 2 illustrating the encoding of two logical values into mousetrap logic. The mousetrap logic values are then encoded into PKG recoding values to reduce the number of w...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06F7/50G06F7/508
CPCG06F7/508G06F2207/3872
Inventor COLON-BONET, GLENN T
Owner HEWLETT PACKARD DEV CO LP
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