SMSC LAN8710, LAN8710i, MII 10/100, RMII 10/100 6.1Serial Management Interface (SMI) Timing, MDC, MDIO, MDIO, DATASHEET

MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology in a Small Footprint

Datasheet

Chapter 6 AC Electrical Characteristics

The timing diagrams and limits in this section define the requirements placed on the external signals of the Phy.

6.1Serial Management Interface (SMI) Timing

The Serial Management Interface is used for status and control as described in Section 4.14.

Clock -						T1.1
MDC
				T1.2
Data Out -
						Valid Data
MDIO						(Read from PHY)
	T1.3				T1.4
Data In -			Valid Data
MDIO		(Write to PHY)

Figure 6.1 SMI Timing Diagram

Table 6.1 SMI Timing Values

PARAMETER	DESCRIPTION	MIN	TYP	MAX	UNITS	NOTES
T1.1	MDC minimum cycle time	400			ns
T1.2	MDC to MDIO (Read from PHY)	0		30	ns
	delay
T1.3	MDIO (Write to PHY) to MDC setup	10			ns
T1.4	MDIO (Write to PHY) to MDC hold	10			ns

SMSC LAN8710/LAN8710i	55	Revision 1.0 (04-15-09)
	DATASHEET