Integrated circuits
First Claim
1. An apparatus comprising a processor, a controller and plural terminals, each terminal comprising a connection between the apparatus and a peripheral device,wherein each terminal interfaces to a logic circuit on the apparatus by a respective input/output IO cell in series connection with a respective IO isolation circuit and wherein the controller is operable on power up of the apparatus to activate a reset state and to release the reset state prior to releasing IO isolation by one or more of the IO isolation circuits.
2 Assignments
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Accused Products
Abstract
An integrated circuit comprises a processor, a controller and plural terminals. Each terminal constitutes a connection between the integrated circuit and a peripheral device. Each terminal is connected to a logic circuit on the integrated circuit by a respective IO cell in series connection with a respective IO isolation circuit and wherein the controller is operable on power up of the integrated circuit to activate a reset state and to release the reset state prior to releasing IO isolation by one or more of the IO isolation circuits. Each IO isolation circuit may be arranged so that a default state of the IO isolation circuit is a state in which the IO cell is isolated from the logic circuit. The IO isolation circuits may be controllable by software, for instance a driver for a peripheral device connected to the terminal associated with the IO isolation circuit. Plural IO isolation circuits may be connected so as to be commonly controllable by a single control signal from the controller.
10 Citations
20 Claims
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1. An apparatus comprising a processor, a controller and plural terminals, each terminal comprising a connection between the apparatus and a peripheral device,
wherein each terminal interfaces to a logic circuit on the apparatus by a respective input/output IO cell in series connection with a respective IO isolation circuit and wherein the controller is operable on power up of the apparatus to activate a reset state and to release the reset state prior to releasing IO isolation by one or more of the IO isolation circuits.
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12. A method of operating an integrated circuit comprising a processor, a controller and plural terminals, each terminal comprising a connection between the integrated circuit and a peripheral device, wherein each terminal interfaces to a logic circuit on the integrated circuit by a respective input/output IO cell in series connection with a respective IO isolation circuit, the method comprising, on power up of the integrated circuit:
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entering a reset state; subsequently releasing the reset state; and subsequently releasing IO isolation by the IO isolation circuits. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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13. A memory storing machine readable instructions, which when executed by computing apparatus control it to perform a method of operating an integrated circuit comprising a processor, a controller and plural terminals, each terminal comprising a connection between the integrated circuit and a peripheral device, wherein each terminal interfaces to a logic circuit on the integrated circuit by a respective input/output IO cell in series connection with a respective IO isolation circuit,
the method comprising, on power up of the integrated circuit: -
entering a reset state; subsequently releasing the reset state; and subsequently releasing IO isolation by the IO isolation circuits.
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Specification