AM3356: AM335X RMII_RXD latch edge against RMII1_REFCLK

Part Number:AM3356

Hi,

I'm using AM3356 to connect to EMAC chip LAN8720A.

LAN8720 toggle its RXD, CRS_DV and RXER at the rising edge of its 50MHz clock output REFCLK, the Max Tco is 5ns. 

While AM3356 also latches the RXD, CRS_DV and RXER at the rising ege of REFCLK input according to Figure 7-11 in the datasheet, it requires setup of 4ns and hold of 2ns.

When connecting LAN8720 signals directly to AM3356 without addional timing adjustment component, the RXD, CRS_DV and RXER's  setup and hold time may not be met for AM3356, or may not have enought margin.

So is  there one configuration resister in AM3356 that I can set the processor to latch RXD, CRS_DV and RXER at the falling edge of the REFCLK to increase the setup time and hold time margin?

Thanks,

Peng,