我SP I2C multiple slave address

My question is similar to that of "The Dude".
Specifically, I want to know if I can program multiple SLG46826 ISP parts in-system utilizing different target code for each, but on the same I2C bus. To do this, I would use the I/O Pins (IO5 thru IO2) as slave addresses unique to each target code. Is the default condition of address CA (Register bits 1623:1620) set for register bits or I/O pins? I don't see a map of default values. If set for register bits 1619:1616, is there a clever workaround that doesn't require a separate I2C bus for each IC?

Thank-you.