DS90UB964-Q1: Behavior of I2C busy in broadcast

Hello,
We received your question and this has been assigned for an Apps engineer to look at and respond to.

HI Palaniappan,

Unfortunately, I haven't received answer, yet. I am still waiting for answer of your experts.

Regards,
Kenshow

Hi Kenshow,

When UB964 is in broadcast mode, it cannot distinguish ACKs from the remote slaves as all slave device have been assigned the same aliases ( a requirement for broadcasting a command).  ACK is an OR operator of the responding remote slaves via I2C.

I suggest reviewing the following thread:

Regards,

Davor

HI Davor,

My question is BUSY action on I2C from slave device, not ACK.
Or, do you mean that broadcast mode ignores the BUSY?

Regards,
Kenshow

Hi Davor,

BUSY means wait state of master when slaves hold the SCL line LOW.
When one of slave devices holds SCL line LOW, dose the master waits until High?

Regards,
Kenshow

Hi Kenshow,

Yes, each FPD-Link III device features an I2C interface that can perform a function of a I2C master capable of arbitration with other masters, allowing multiple masters and slaves to exist on the same I2C bus.

Regards,

Davor

Hi Davor,

If ACK and BUSY(wait) are required by slave devices at the same time in broadcasting, what dose the UB964 behave?
This case is, one of UB913(or Camera device) requires BUSY and another UB913 returns ACK. Then, UB964 progress broadcast or stop it until busy finished. which one?

Regards,
Kenshow

Hi Davor,

Please reply about my addition question. I am waiting for your answer.

Regards,
Kenshow