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Embedded Systems Architecture by Daniele Lacamera

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Bus wiring

The number of lines needed to establish bidirectional communication depends on the specific protocol too. Since one wire can only transport one bit of information in one direction at a time, to achieve full-duplex communication, a transceiver should connect to two different wires for transmitting and receiving data. If the protocol supports half-duplex communication, it should instead provide a reliable mechanism to regulate media access and switch between receiving and transmitting data on the same wire.

Depending on the protocol, devices accessing the bus may either share a similar implementation and act as peers, or have different roles assigned when participating in the communication, for example, if a master device is in charge ...

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