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testing I2C master and slave

hi there,
i am using a Philips SAA56XX MCU
on it are 2 I2C port
i have connected these 2 port together
Port1<---->Port2

i configured Port1 to be Master
and Port2 to be Slave with address 0x70

now when i tried to send something to 0x70 from master, i could not get an interrupt rised on the S1STA

Electrically these 2 are connected less than a 30 cm long wire, running 5V.

any ideas on how can i test that my I2C routine on SAA56XX is working fine on both I2C port?

Thanks
Jon