Arbitration Procedure Between Two Master Transmitters - Texas Instruments OMAP5910 Technical Reference Manual

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Inter-Integrated Circuit Controller

Slave Receiver

Figure 7–28. Arbitration Procedure Between Two Master Transmitters

out on the data line SDA in synchronism with the clock pulses that are gener-

ated by the master device. It does not generate the clock, but it can hold the

clock line SCL low while intervention of the local host is required.

In this mode serial data bits received on the bus line SDA are shifted-in

synchronously with the clock pulses on SCL, which are generated by the

master device. It does not generate the clock, but it can hold the clock line SCL

low while intervention of the local host is required following the reception of a

If two or more master transmitters start a transmission on the same bus almost

simultaneously, arbitration procedure is invoked. The arbitration procedure

uses the data presented on the serial bus by the competing transmitters. When

a transmitter senses that a high signal it has presented on the bus has been

overruled by a low signal, it switches to the slave receiver mode. Figure 7–28

shows the arbitration procedure between two devices. The arbitration proce-

dure gives priority to the device that transmits the serial data stream with the

lowest binary value. If two or more devices send identical first bytes, arbitration

continues on the subsequent bytes.

Device #1 loses arbitration and

switches off.