SMSC FlexPWR LAN8720 - Manual (Page 61)

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i 61 Revision 1.0 (05-28-09)
DATASHEET
6.3.1.2 100M RMII Transmit Timing (50MHz REF_CLK OUT)
Figure 6.7 100M RMII Transmit Timing Diagram (50MHz REF_CLK OUT)
Table 6.7 100M RMII Transmit Timing Values (50MHz REF_CLK OUT)
PARAMETER DESCRIPTION MIN TYP MAX UNITS NOTES
T12.1 Transmit signals required setup to
rising edge of REFCLKO 7 ns
T12.2 Transmit signals required hold
after rising edge of REFCLKO 2.5 ns
REFCLKO frequency 50 MHz
REFCLKO
Data In -
TXD[1:0]
T
12.1
TX_EN
T
12.2
Valid Data