SMSC LAN8710, LAN8710i, MII 10/100, RMII 10/100 6.4RMII CLKIN Requirements, 6.5Reset Timing

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

Datasheet

6.4RMII CLKIN Requirements

Table 6.10 RMII CLKIN (REF_CLK) Timing Values

PARAMETER	DESCRIPTION	MIN	TYP	MAX	UNITS	NOTES
	CLKIN frequency		50		MHz
	CLKIN Frequency Drift			± 50	ppm
	CLKIN Duty Cycle	40		60	%
	CLKIN Jitter			150	psec	p-p – not RMS

6.5Reset Timing

T11.1

nRST

T11.2T11.3

Configuration

Signals

T11.4

Output drive

Figure 6.10 Reset Timing Diagram

Table 6.11 Reset Timing Values

PARAMETER	DESCRIPTION	MIN	TYP	MAX	UNITS	NOTES
T11.1	Reset Pulse Width	100			us
T11.2	Configuration input setup to	200			ns
	nRST rising
T11.3	Configuration input hold after	10			ns
	nRST rising
T11.4	Output Drive after nRST rising	20		800	ns	20 clock cycles for
						25 MHz clock
						or
						40 clock cycles for
						50MHz clock

Revision 1.0 (04-15-09)	64	SMSC LAN8710/LAN8710i
	DATASHEET