Optimization by using output drivers for discrete input interface
First Claim
1. 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:
- associating a serial peripheral interface and a desired input with a spare output of an output driver of the processor;
accessing the fault detection circuitry of the spare output through the serial peripheral interface to determine an input value; and
determining a state of a switch based upon the determined input value.
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Accused Products
Abstract
The invention relates to design optimization of microprocessors using spare driver outputs for discrete input interfaces. An output driver or pre-FET driver is used to interface a discrete input for a microprocessor. To read the discrete interface, a fault detection mechanism of the pre-FET driver or the output driver is used. Monitoring the fault register of the output driver allows the condition of the external switch to be understood. The circuit is able to read either a switched to battery type interface or a switched to ground type interface, thereby eliminating hardware proliferation. The fault register is read through a serial peripheral interface (SPI) bus, thereby removing the need for a dedicated microprocessor pin required for the interface. Toggling the gate in the pre-FET driver interface permits adding diagnostic capability for the discrete input interface.
7 Citations
18 Claims
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1. 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:
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associating a serial peripheral interface and a desired input with a spare output of an output driver of the processor; accessing the fault detection circuitry of the spare output through the serial peripheral interface to determine an input value; and determining a state of a switch based upon the determined input value. - View Dependent Claims (2, 3, 4, 5)
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6. 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:
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associating a serial peripheral interface and a desired input with a spare output of a pre-FET driver of the processor; determining an input value based on the fault detection circuitry through the serial peripheral interface of the pre-FET driver; and determining a state of a switch based upon the determined input value. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A processor capable of utilizing outputs as input values comprising:
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processing circuitry coupled to a plurality of outputs, at least one of said outputs inducing 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, such that a state of a switch is determined. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification