implementing vhdl I2C MUX in CPLD VHDL

[Altera_Forum]

hi all ,  

i need to implement i2c mux that consists of: 4 i2c masters  8 i2c slaves  external hardwre can configure with master is going to be connected to one of the 8 slaves.  The problem is that I2C signal ( SDA) is bidirectional, which makes   I2C mux within an CPLD hard to implement.   thans

[Altera_Forum]

The I2C allows 2 masters and 8 slaves on the same bus. Do your really need to have a "mux"? 

 Anyway, if you really do need, you can do it by making the CPLD logic track the state of the I2C transaction, so it can known what direction to use for SDA.

[Altera_Forum]

--- Quote Start ---  The I2C allows 2 masters and 8 slaves on the same bus. Do your really need to have a "mux"?  Anyway, if you really do need, you can do it by making the CPLD logic track the state of the I2C transaction, so it can known what direction to use for SDA.  --- Quote End ---    on each bus is going to be one master and one slave. external hardwre configures whitch master is going to be connected to one of the 8 slaves.  how can the cpld track the state of the I2C transaction?  do you have ref design of guidelines ?  thanks