Selectively disabled output
First Claim
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1. An integrated circuit device, comprising:
- a storage circuit that stores first data;
a device package comprising a first power supply pin and a second power supply pin;
a first power supply pad electrically coupled to the first power supply pin;
a second power supply pad electrically coupled to the second power supply pin, wherein the integrated circuit device operates using electrical power received when a first voltage is applied to the first power supply pin and a second voltage is applied to the second power supply pin;
an input pad selectively connected affixedly to one of the first power supply pin and the second power supply pin; and
a readout circuit communicatively coupled to the storage circuit and electrically coupled to the input pad via a first circuit line, wherein the readout circuit;
enables readout of the first data from the integrated circuit device when the input pad is electrically connected affixedly to the second power supply pin and the second voltage is applied to the input pad via the second power supply pin; and
disables the readout of the first data from the integrated circuit device when the input pad is electrically connected affixedly to the first power supply pin and the first voltage is applied to the input pad via the first power supply pin, wherein the integrated circuit device does not operate properly when the second voltage is supplied to the first power supply pin to facilitate preventing readout of the first data from the integrated circuit device while the input pad is electrically connected affixedly to the first power supply pin.
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Abstract
Circuits, methods, and apparatus are directed to an integrated circuit having a disabling element that can disable a reading of data from the circuit. Once the disabling element is set to not allow a reading of the data, the disabling element cannot be changed to allow a reading of the data. The data may be configuration data or internal data stored within the integrated circuit. Examples of the disabling element include a memory element, a break in a circuit line, and an input pad configuration.
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Citations
20 Claims
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1. An integrated circuit device, comprising:
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a storage circuit that stores first data; a device package comprising a first power supply pin and a second power supply pin; a first power supply pad electrically coupled to the first power supply pin; a second power supply pad electrically coupled to the second power supply pin, wherein the integrated circuit device operates using electrical power received when a first voltage is applied to the first power supply pin and a second voltage is applied to the second power supply pin; an input pad selectively connected affixedly to one of the first power supply pin and the second power supply pin; and a readout circuit communicatively coupled to the storage circuit and electrically coupled to the input pad via a first circuit line, wherein the readout circuit; enables readout of the first data from the integrated circuit device when the input pad is electrically connected affixedly to the second power supply pin and the second voltage is applied to the input pad via the second power supply pin; and disables the readout of the first data from the integrated circuit device when the input pad is electrically connected affixedly to the first power supply pin and the first voltage is applied to the input pad via the first power supply pin, wherein the integrated circuit device does not operate properly when the second voltage is supplied to the first power supply pin to facilitate preventing readout of the first data from the integrated circuit device while the input pad is electrically connected affixedly to the first power supply pin. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for manufacturing a programmable logic device used to store first data, comprising:
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electrically connecting a first power supply pad to a first power supply pin formed on a device package to facilitate receiving electrical power used to operate the programmable logic device when a first voltage is applied to the first power supply pin; electrically connecting a second power supply pad to a second power supply pin formed on the device package to facilitate receiving the electrical power when a second voltage is applied to the second power supply pin; electrically connecting affixedly an input pad to the second power supply pin to facilitate debugging design of the programmable logic device by enabling the programmable logic device to output the first data when the second voltage is applied to the input pad via the second power supply pin; and electrically connecting affixedly the input pad to the first power supply pin to disable the output of the first data from the programmable logic device after debugging the design, wherein the programmable logic device; disables the output of the first data from the integrated circuit device when the input pad is electrically connected affixedly to the first power supply pin and the first voltage is applied to the input pad via the first power supply pin; and does not operate properly when the second voltage is supplied to the first power supply pin to facilitate preventing the output of the first data from the programmable logic device while the input pad is electrically connected affixedly to the first power supply pin. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An electronic system, comprising:
a programmable logic device that operates using electrical power to perform logical functions in the electronic system, wherein the programmable logic device comprises; configuration data memory that stores configuration data; a plurality of logic blocks programmed based at least in part on the configuration data; a first power supply pin and a second power supply pin that facilitate receiving the electrical power used to operate the programmable logic device when a first voltage is applied to the first power supply pin and a second voltage is applied to the second power supply pin; and an input pad, wherein the programmable logic device; enables output of the configuration data from the programmable logic device when the input pad is electrically connected affixedly to the second power supply pin and the second voltage is applied to the input pad via the second power supply pin; and disables the output of the configuration data from the programmable logic device when the input pad is electrically connected affixedly to the first power supply pin and the first voltage is applied to the input pad via the first power supply pin, wherein the programmable logic device does not function properly when the second voltage is supplied to the first power supply pin to facilitate preventing the output of the configuration data from the programmable logic device while the input pad is electrically connected affixedly to the first power supply pin. - View Dependent Claims (16, 17, 18, 19, 20)
Specification