Patent ID: 7984090

Claim:
A function generator for a digital system that receives a generator input value and that generates a generator output value, the function generator comprising: a plurality of sub-function generators, each sub-function generator having an input that selectively receives a respective sub-function input value responsive to the generator input value and having an output that provides a respective sub-function output value responsive to the respective sub-function input value; a control system responsive to at least a first portion of the generator input value to identify an input case, the control system responsive to the input case to selectively apply a value responsive to at least a second portion of the generator input value to the respective input of at least one selected sub-function generator, the control system further responsive to the input case to selectively output a value responsive to the respective sub-function output value of the selected sub-function generator to produce the generator output value, the control system further responsive to the first portion of the generator input value to inhibit the value responsive to the at least a second portion of the generator input value from being applied to the respective input of at least one non-selected sub-function generator to inhibit the at least one non-selected sub-function generator from providing a respective sub-function output value in response to the second portion of the generator input value.