Method and apparatus for avoiding bi-directional signal fighting of serial interface
AssigneeSunplus Technology Co., Ltd.
InventorsYu-Chu Lee, Sheng-Ping Chen, Geng-Lin Chen
Life of this patent
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Abstract
A method and apparatus for avoiding bi-directional signal fighting of a serial interface is disclosed. The serial peripheral interface includes a clock signal line and a data line. In this method, during normal operation, a first clock signal is received and transformed to output a second clock signal in the clock signal line, wherein the second clock signal has a first duty period. When the output of the data in the data line switches to input, the second clock signal switches to have the second duty period, wherein the second duty period is larger than the first duty period.
Claims6
A master apparatus for avoiding bi-directional signal fighting of a serial interface, the serial interface comprising a clock signal line and a data line, the master apparatus comprising:
- a serial interface clock signal generator, receiving and transforming a first clock signal to output a second clock signal in the clock signal line, wherein the second clock signal having a first duty period during normal operation;
- and
- a controller, coupled to the serial interface clock signal generator, when output of data in the data line switching to input, the controller outputting a control signal to the serial interface clock signal generator so that the second clock signal switches to have a second duty period, wherein the second duty period is larger than the first duty period.
A method of avoiding bi-directional signal fighting of a serial interface, the serial interface comprising a clock signal line and a data line, the method comprising:
- receiving and transforming a first clock signal to output a second clock signal in the clock signal line, wherein the second clock signal having a first duty period during normal operation;
- and
- when output of data of the data line switches to input, the second clock signal switching to have a second duty period, wherein the second duty period being larger than the first duty period.
An apparatus for avoiding bi-directional signal fighting of a serial interface, the serial interface comprising a clock signal line and a data line, the apparatus comprising:
- a serial interface clock signal generator, receiving and transforming a first clock signal to output a second clock signal in the clock signal line, wherein the second clock signal having a first duty period during normal operation;
- and
- a controller, coupled to the serial interface clock signal generator, when output of data in the data line switches to input, the controller outputting a control signal to the serial interface clock signal generator so that the second clock signal switches to have a second duty period, wherein the second duty period is larger than the first duty period.
Dependencies are inferred from the claim text.