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Push pull vs open drain in multi master configuration

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chandu.kurapati

chandu.kurapati

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Hi,
From my experience, multi master configuration is possible with open drain
configuration i.e for example I2C, CAN etc....

But in push pull configuration only multi slave is possible i.e example: SPI

Why multi master configuration is not possible in push pull configuration &
what the points should be consider to design protocol as a multi master
& multi slave supported protocol.
 

all resumes on how do you detect masters collision? if you use a open collector schema, you can detect collision when you try to send a 1 (open drain an 1 from the pull up) and read a 0 ( the other master is sending the line to 0) if you use a direct push-pull, the collision itself could burn the output of any or both masters.

you can try to avoid collision by other methods, like token pass, daisy-chain, etc...
 
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