From I2C specification (http://www.nxp.com/documents/user_manual/UM10204.pdf), the requirement of rf is from 20ns*(VDD/5.5) to 300ns. (rf is the fall time of both SDA and SCL signals)
For the ZC702 Evaluation Platform, VDD is 1.8v so the requirement should be 6.54ns ~ 300ns.
I have tested this parameter of PS I2C on ZC702.
The tf @300KHz/400KHz on ZC702 is about 1.68ns. This does not meet the requirements of the I2C specification.
Why is this the case?
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