Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology
Datasheet
5.5.5
RMII Interface Timing
tclkp
tclkh tclkl
CLKIN
(REF_CLK)
toval
toval
tohold
RXD[1:0],
RXER
tohold
toval
CRS_DV
TXD[1:0]
TXEN
tsu tihold
tsu tihold
tihold
tihold
tsu
Figure 5.6 RMII Timing
Table 5.10 RMII Timing Values
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
NOTES
tclkp
tclkh
tclkl
CLKIN period
20
ns
ns
ns
ns
CLKIN high time
CLKIN low time
tclkp*0.35
tclkp*0.35
tclkp*0.65
tclkp*0.65
14.0
toval
RXD[1:0], RXER, CRS_DV output valid from
rising edge of CLKIN
Note 5.19
Note 5.19
Note 5.19
Note 5.19
tohold
tsu
RXD[1:0], RXER, CRS_DV output hold from
rising edge of CLKIN
3.0
4.0
1.5
ns
ns
ns
TXD[1:0], TXEN setup time to rising edge of
CLKIN
tihold
TXD[1:0], TXEN input hold time after rising edge
of CLKIN
Note 5.19 Timing was designed for system load between 10 pf and 25 pf.
SMSC LAN8710A/LAN8710Ai
75
Revision 1.4 (08-23-12)
DATASHEET
SMSC [ SMSC CORPORATION ]
