lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 60

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

Revision 1.0 (04-15-09)
6.3
6.3.1
6.3.1.1
PARAMETER
T11.1
REFCLKO
Data Out -
RXD[1:0]
CRS_DV
The 50MHz REF_CLK OUT timing applies to the case when LED/nINTSEL is pulled-low on the
LAN8720. In this mode, a 25MHz crystal or clock oscillator must be provided to the LAN8720. For
more information on 50MHz REF_CLK OUT mode, see
RMII 100Base-T TX/RX Timings (50MHz REF_CLK OUT)
100M RMII Receive Timing (50MHz REF_CLK OUT)
RMII 10/100Base-TX/RX Timings (50MHz REF_CLK OUT)
Output delay from rising edge of
REFCLKO to receive signals
output valid
REFCLKO frequency
Figure 6.6 100M RMII Receive Timing Diagram (50MHz REF_CLK OUT)
Table 6.6 100M RMII Receive Timing Values (50MHz REF_CLK OUT)
DESCRIPTION
T
11.1
DATASHEET
60
MIN
1.5
Valid Data
Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
TYP
50
Section 4.7.2
MAX
5
UNITS
MHz
ns
SMSC LAN8720/LAN8720i
NOTES
Datasheet