SMSC FlexPWR LAN8710i - Manual (Page 64)

MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR ® Technology in a Small Footprint
Datasheet
Revision 1.0 (04-15-09) 64 SMSC LAN8710/LAN8710i
DATASHEET
6.4 RMII CLKIN Requirements
6.5 Reset Timing
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
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
nRST rising 200 ns
T11.3 Configuration input hold after
nRST rising 10 ns
T11.4 Output Drive after nRST rising 20 800 ns 20 clock cycles for
25 MHz clock
or
40 clock cycles for
50MHz clock
nRST
Configuration
Signals
T
11.1
T
11.4
O utput drive
T
11.2
T
11.3