an integrated circuit
An integrated circuit and circuit technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., can solve problems such as increased energy consumption of devices, damage to input buffer circuits, and unpredictable operation.
Active Publication Date: 2017-04-05
MACRONIX INT CO LTD
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Problems solved by technology
During operation, if an I / O pad is “floating,” meaning that the pad is not being driven at a predictable voltage by an external or internal driver, the pad may float at a voltage level that sufficient to cause an input buffer circuit connected to this pad to turn on and operate unpredictably
This unpredictable operation increases the power consumption of the device and may cause damage to the input buffer circuit
A floating voltage on this pad can also set the input buffer circuit to an indeterminate state, causing indeterminate signal transmission to the internal circuitry of the device and causing oscillation and other spurious effects
Method used
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[0023] A detailed description of embodiments of the present invention is provided with reference to the accompanying drawings. The following description is representative of examples and methods with reference to specific structures. It should be understood that there is no intent to limit the invention to the specific disclosed embodiments and methods, and that the invention may be practiced using other features, elements, methods and embodiments. The preferred embodiments are described to illustrate the invention, not to limit its scope, which is defined by the scope of the claims. Those skilled in the art will recognize various equivalent modifications to the description below. Similar elements in different embodiments are generally referred to by similar reference numerals.
[0024] figure 1 A simplified block diagram of the input / output circuitry of a pad 102 of the integrated circuit device 100 is shown. The term "pad" as used herein refers to a circuit node adapted ...
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The invention discloses an integrated circuit, which comprise a pad, wherein the pad is suitable to receive a signal from an external driver, a status register 110 is used to be programmed to be a status, a status indication is used to be provided with a voltage level, and the voltage level is used to respond the status of the pad in during the initialize period of a circuit which is arranged on an integrated circuit device, and can be corresponding to a logic low level or a logic high level. A voltage holding circuit is coupled onto the pad and the status register, and is arranged to respond events which lead to initialization to apply on the pad and the voltage level.
Description
technical field [0001] The present invention relates to an integrated circuit, and more particularly to a pull-down and pull-up circuit for an input / output pad of an integrated circuit. Background technique [0002] Integrated circuits include input / output (I / O) pads for receiving and transmitting signals. During operation, if an I / O pad is “floating,” meaning that the pad is not being driven at a predictable voltage by an external or internal driver, the pad may float at a voltage level that enough to cause an input buffer circuit connected to this pad to turn on and operate unpredictably. This unpredictable operation increases the power consumption of the device and may result in damage to the input buffer circuitry. A floating voltage on the pad can also set the input buffer circuit to an indeterminate state, causing indeterminate signal transmission to the device's internal circuitry and causing oscillations and other spurious effects. [0003] To avoid this problem, ...
Claims
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IPC IPC(8): G05F1/56
Inventor 张坤龙陈耕晖张钦鸿林兆欣
Owner MACRONIX INT CO LTD