SMSC FlexPWR LAN8720 - Manual (Page 57)

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i 57 Revision 1.0 (05-28-09)
DATASHEET
6.2.1.2 100M RMII Transmit Timing (50MHz REF_CLK IN)
Figure 6.3 100M RMII Transmit Timing Diagram (50MHz REF_CLK IN)
Table 6.3 100M RMII Transmit Timing Values (50MHz REF_CLK IN)
PARAMETER DESCRIPTION MIN TYP MAX UNITS NOTES
T8.1 Transmit signals required setup to
rising edge of CLKIN 4 ns
T8.2 Transmit signals required hold
after rising edge of CLKIN 2 ns
CLKIN frequency 50 MHz
Clock In -
CLKIN
Data In -
TXD[1:0]
T
8.1
TX_EN
T
8.2
Valid Data