Patent ID: 7512771
Filing Date: 2009-03-31
Classification: G06F

Abstract:
1. Mapping circuitry for mapping an input value, within a preselected range of allowable input values, to a corresponding output value within a preselected range of allowable output values, said circuitry comprising: a first candidate output value producing unit connected for receiving said input value and operable to produce a first candidate output value that differs by a first offset value from the received input value; a second candidate output value producing unit connected for receiving said input value and operable, during operation of said first candidate output value producing unit to produce said first candidate output value, to produce a second candidate output value that differs by a second offset value from the received input value, the first and second offset values being such that a difference between them is equal to a difference between respective output-range limit values defining the limits of the preselected output-value range and such that, for any said input value within said preselected input-value range, one of the first and second candidate output values is within the preselected output-value range and the other of those two values is outside that range; an in-range value determining unit operable to determine, during operation of one or both of said first and second candidate value producing units to produce said first and second candidate output values, which one of said first and second candidate output values is within said preselected output-value range; and an output value selection unit which selects as said corresponding output value that one of said first and second candidate output values which is determined to be within said output-value range.