LAN8187_06 Datasheet, PDF (34/72 Pages) SMSC Corporation – ±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM

±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR^TM
Datasheet
MDC
MDI0
Read Cycle
32 1's 0 1 1 0 A4 A3 A2 A1 A0 R4 R3 R2 R1 R0
D15 D14
Preamble
Start of
Frame
OP
Code
PHY Address
Register Address
Turn
Around
...
...
Data
D1 D0
Data To Phy
Figure 4.6 MDIO Timing and Frame Structure - READ Cycle
Data From Phy
MDC
MDIO
Write Cycle
32 1's 0 1 0 1 A4 A3 A2 A1 A0 R4 R3 R2 R1 R0
D15 D14
Preamble
Start of
Frame
OP
Code
PHY Address
Register Address
Turn
Around
...
...
Data
D1 D0
Data To Phy
Figure 4.7 MDIO Timing and Frame Structure - WRITE Cycle
SMSC LAN8187/LAN8187I
34
DATASHEET
Revision 1.0 (12-14-06)