lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 55

• 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
Chapter 6 AC Electrical Characteristics
SMSC LAN8720/LAN8720i
6.1
PARAMETER
Data Out -
Data In -
Clock -
T1.1
T1.2
T1.3
T1.4
MDIO
MDIO
MDC
The timing diagrams and limits in this section define the requirements placed on the external signals
of the Phy.
The Serial Management Interface is used for status and control as described in
Serial Management Interface (SMI) Timing
MDC minimum cycle time
MDC to MDIO (Read from PHY)
delay
MDIO (Write to PHY) to MDC setup
MDIO (Write to PHY) to MDC hold
DESCRIPTION
T
1.3
(Write to PHY)
Figure 6.1 SMI Timing Diagram
Valid Data
Table 6.1 SMI Timing Values
T
1.2
DATASHEET
T
1.4
T
(Read from PHY)
55
1.1
Valid Data
MIN
400
10
10
0
TYP
MAX
30
UNITS
ns
ns
ns
ns
Section
Revision 1.0 (04-15-09)
4.14.
NOTES