Looking at the ADV7511 hardware users manual the CEC pin has a diode/resistor
pullup where the diode max leakage current is specified. I am connecting to
TPD12S016 esd protection chip, which does not have a diode shown on the phy
side CEC pin. I need to know why that diode is shown in the circuit, possibly
just protection from 5V CEC drive from device on other end of cable? In that
case the TPD12S016 will drive only 3.3V (that is my VCCA voltage) to the phy
and its internal pullup will work properly without diode.