how to drive high('b1) bydefault if nobody is driving the interface signal

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rexjohn4u

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Hello,

I am trying to implement an I2C interface. SCL and SDA signals are on high('b1) state if in stop/inactive state. How can i model the same?

Later if i want to drive 'b0 or 'b1 from the driver, it should not throw error. And if i am not driving any value, it should go back to high('b1) state

Please explain what is 'pullup" premitive and how it is used
 

I presume you know that real I2C hardware depends on pull-up resistors, so you are apparently asking how to handle it in simulation.

Verilog has net drive strength specifications, a pull1 drive strength should work in this case. It will be overriden by the default strong0 drive sttrength of the open drain SDA and SCL driver.
 
In simulation the I2C pads, should be connected to "H" state, and your chip could only drive '0', never drive '1' in I2C protocol, the pull-up (external or internal in your pads) will rise the line.
 

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