AM2432: AM2432 RGMII_RXC criteria

AM2432 does not support Spread Spectrum Clocking. Tw(RXCH) and Tw(RXCL) are input parameters for AM2432 and the limits defined for this parameter were taken from the RGMII standard. It appears the attached PHY is introducing too much duty cycle distortion by creating shorter than expected high pulses and longer than expected low pulses. The AM2432 device was not validated to operate with clock pulse widths outside of the limits defined by the RGMII standard. Therefore, we expect the attached device to provide a clock that operates within the limits of 3.6ns to 4.4ns. Operating outside of the limits on a clock input could cause the RGMII receiver to do unpredictable things.