SMSC LAN8710i Manual De Usuario
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
nRST rising
200
ns
T11.3
Configuration input hold after
nRST rising
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