sent).

There may be four potential modes of operation for a given bus device, although most devices only use a single role and its two modes:
* Controller (master) transmit: Controller node is sending data to a target (slave).
* Controller (master) receive: Controller node is receiving data from a target (slave).
* Target (slave) transmit: Target node is sending data to the controller (master).
* Target (slave) receive: Target node is receiving data from the controller (master).

In addition to 0 and 1 data

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