Optimization by using output drivers for discrete input interface

A method for design optimization of a processor to eliminate hardware proliferation using a processor having outputs with fault detection circuitry, comprising the steps of:

• identifying a spare output of a pre-FET driver of the processor;
• associating a serial peripheral interface and a desired input with the spare output;
• and
• enabling the processor to determine an input value based on the fault detection circuitry through the serial peripheral interface of the pre-FET driver.

A processor capable of utilizing outputs as input values comprising:

• processing circuitry coupled to a plurality of outputs, at least one of said outputs including fault detection circuitry;
• a serial peripheral interface coupled to a desired input;
• a connection between said at least one output having fault detection circuitry and the desired input;
• and
• means for determining the value of the desired input based on said serial peripheral interface and said connection.