LAN8710A Datasheet, PDF (76/82 Pages) SMSC Corporation – Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR Technology

Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR^® Technology
Datasheet
5.5.5.1 RMII CLKIN Requirements
Table 5.11 RMII CLKIN (REF_CLK) Timing Values
PARAMETER
CLKIN frequency
CLKIN Frequency Drift
CLKIN Duty Cycle
CLKIN Jitter
MIN TYP MAX UNITS
50
MHz
± 50 ppm
40
60
%
150
psec
NOTES
p-p – not RMS
5.5.6
SMI Timing
This section specifies the SMI timing of the device. Please refer to Section 3.5, "Serial Management
Interface (SMI)," on page 33 for additional details.
MDC
t_val
t_ohold
MDIO
(Data-Out)
t_clkp
t_clkh t_clkl
t_ohold
t_su t_ihold
MDIO
(Data-In)
Figure 5.7 SMI Timing
Table 5.12 SMI Timing Values
SYMBOL
DESCRIPTION
MIN
t_clkp
t_clkh
t_clkl
t_val
t_ohold
t_su
t_ihold
MDC period
400
MDC high time
160 (80%)
MDC low time
160 (80%)
MDIO (read from PHY) output valid from rising
edge of MDC
MDIO (read from PHY) output hold from rising
0
edge of MDC
MDIO (write to PHY) setup time to rising edge
10
of MDC
MDIO (write to PHY) input hold time after rising
10
edge of MDC
Revision 1.4 (08-23-12)
76
DATASHEET
MAX
300
UNITS
ns
ns
ns
ns
NOTES
ns
ns
ns
SMSC LAN8710A/LAN8710Ai