SMSC LAN8720i User Manual
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
rising edge of REFCLKO
7
ns
T12.2
Transmit signals required hold
after rising edge of REFCLKO
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