LAN8710A Datasheet, PDF (75/82 Pages) SMSC Corporation – Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR Technology

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