LAN8810 Datasheet, PDF (73/83 Pages) Microchip Technology – GMII 10/100/1000 Ethernet Transceiver

LAN8810/LAN8810I
5.5.7 SMI TIMING
This section specifies the SMI timing of the device. Please refer to Section 3.4, "Serial Management Interface (SMI),"
on page 20 for additional details.
FIGURE 5-9:
SMI TIMING
MDC
t_val
t_ohold
MDIO
(Data-Out)
MDIO
(Data-In)
t_clkp
t_clkh t_clkl
t_ohold
t_su t_ihold
TABLE 5-18: SMI TIMING VALUES
Symbol
Description
Min
Max
t_clkp
MDC period
400
t_clkh
MDC high time
160 (80%)
t_clkl
MDC low time
160 (80%)
t_val
MDIO (read from PHY) output valid from rising
edge of MDC
300
t_ohold
MDIO (read from PHY) output hold from rising
edge of MDC
0
t_su
MDIO (write to PHY) setup time to rising edge
of MDC
10
t_ihold
MDIO (write to PHY) input hold time after rising
edge of MDC
10
Units
ns
ns
ns
ns
ns
ns
ns
Notes
DS00001870B-page 73
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