SMSC LAN8720i User Manual
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
rising edge of CLKIN
4
ns
T8.2
Transmit signals required hold
after rising edge of CLKIN
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