lan8187 Standard Microsystems Corp., lan8187 Datasheet - Page 34

• Manufacturer Part Number: lan8187
• Description: Lan8187/lan8187i ?15kv Esd Protected Mii/rmii 10/100 Ethernet Transceiver With Hp Auto-mdix & Flexpwr Technology
• Manufacturer: Standard Microsystems Corp.

Revision 1.5 (01-10-08)
MDIO
MDI0
MDC
MDC
Preamble
Preamble
32 1's
32 1's
Start of
Start of
0
Frame
0
Frame
Figure 4.7 MDIO Timing and Frame Structure - WRITE Cycle
Figure 4.6 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
±15kV ESD Protected MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX & flexPWR
DATASHEET
Data To Phy
34
Register Address
Register Address
Around
Around
Turn
Turn
D15
D15
D14
D14
SMSC LAN8187/LAN8187i
Data From Phy
Data
Data
...
...
...
...
D1
D1
TM
Datasheet
Technology
D0
D0