lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 63

• Manufacturer Part Number: lan8720
• Description: Small Footprint Rmii 10/100 Ethernet Transceiver With Hp Auto-mdix Support
• Manufacturer: Standard Microsystems Corp.

Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720/LAN8720i
6.3.2.2
6.4
PARAMETER
PARAMETER
T14.1
T14.2
REFCLKO
10M RMII Transmit Timing (50MHz REF_CLK OUT)
RMII CLKIN Requirements
TXD[1:0]
Data In -
TX_EN
Transmit signals required setup to
rising edge of REFCLKO
Transmit signals required hold
after rising edge of REFCLKO
CLKIN frequency
CLKIN frequency
CLKIN Frequency Drift
CLKIN Duty Cycle
CLKIN Jitter
Figure 6.9 10M RMII Transmit Timing Diagram (50MHz REF_CLK OUT)
Table 6.9 10M RMII Transmit Timing Values (50MHz REF_CLK OUT)
DESCRIPTION
DESCRIPTION
Table 6.10 RMII CLKIN (REF_CLK) Timing Values
T
DATASHEET
14.1
Valid Data
63
MIN
MIN
2.5
40
7
T
TYP
TYP
14.2
50
50
MAX
MAX
± 50
150
60
UNITS
UNITS
psec
MHz
MHz
ppm
ns
ns
%
Revision 1.0 (04-15-09)
p-p – not RMS
NOTES
NOTES