lan8720 Standard Microsystems Corp., lan8720 Datasheet - Page 35

• 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
MDI0
SMSC LAN8720/LAN8720i
MDC
MDIO
MDC
Preamble
Preamble
32 1's
32 1's
Start of
0
Frame
Start of
Frame
0
Figure 4.11 MDIO Timing and Frame Structure - WRITE Cycle
Figure 4.10 MDIO Timing and Frame Structure - READ Cycle
1
1
1
0
Code
Code
OP
OP
0
1
A4 A3 A2 A1 A0 R4 R3 R2 R1 R0
A4 A3 A2 A1 A0 R4 R3 R2 R1 R0
PHY Address
PHY Address
Data To Phy
Read Cycle
Write Cycle
DATASHEET
Data To Phy
35
Register Address
Register Address
Around
Around
Turn
Turn
D15
D15
D14
D14
Data From Phy
Revision 1.0 (04-15-09)
Data
Data
...
...
...
...
D1
D1
D0
D0