Electronic device and method for detecting bidirectional bus competition

Abstract

The invention relates to an electronic device and a device for detecting bidirectional bus competition. The electronic device comprises an output end, an input end, a data output unit, a comparing time schedule controller and a comparing unit, wherein the output end outputs an output data signal to a bidirectional bus; the input end is coupled with the output end and used for receiving a receivingdata signal from the bidirectional bus; the data output unit provides the output data signal; the comparing time schedule controller is used for generating a comparing time schedule signal accordingto the output data signal; and the comparing unit compares the receiving data signal and the output data signal according to the comparing time schedule signal to judge the competition state of the bidirectional bus.

Description

technical field [0001] The invention relates to an electronic device for detecting bus competition and a related method thereof, in particular to an electronic device for detecting bus competition in a half-duplex bus and a related method thereof. Background technique [0002] The bus is a transmission interface used to transmit data between two or several electronic devices. Generally speaking, the bus can be divided into unidirectional and bidirectional. A unidirectional bus can only transmit data from terminal A to terminal B, but cannot transmit data from terminal B to terminal A. A bidirectional bus allows both ends of A and B to transmit data to each other. For a chip component, the advantage of using a bidirectional bus is that fewer pins are required than using a unidirectional bus. [0003] Please refer to figure 1 , figure 1 It is a functional block diagram of an existing master-slave system 10 . The master-slave system 10 performs data transmission between a m...

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Problems solved by technology

Therefore, in order to drive the bidirectional bus 12, the master device 14 and the slave device 16 must compete (Contention). However, during the contention period, when the transmission signal transitions, the bidirectional bus 12 may be driven by both ends of the device at the same time or give up driving at the same time, thus causing Failed to drive bidirectional bus 12

For example, if the data signal S1 and the data signal S2 are transmitted to the bidirectional bus 12 at the same time, the transitions of the two signals will cancel out, causing the receiver 164 and the receiver 144 to fail to receive.

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