LAN9313 Datasheet, PDF (133/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
9.4.6
PHY Mode I²C/SPI Managed
In PHY mode I²C or SPI managed, the Port 1/2 PHYs are accessed via the PMI, and the Virtual PHY
is accessed via the external MII management pins. The SMI slave is not used in these modes.
The Virtual PHY and PMI parallel interfaces are accessible via the I²C/SPI slave interfaces or the
EEPROM Loader. Refer to Section 8.3, "SPI/I2C Slave Controller," on page 118 and Section 8.2.4,
"EEPROM Loader," on page 113 for additional information.
Figure 9.3 details the MII multiplexer management path connections for this mode.
MDI SMI Slave
MDO
MDCLK
MDIO_ DIR
Parallel
Master
MDI Virtual PHY
MDO
MDCLK
MDIO_ DIR
Parallel
Slave
MDI PHY2
MDO
MDIO_ DIR
MDCLK
MDI PHY1
MDO
MDIO_ DIR
MDCLK
Management
Mode Selection
MII Pins
MDIO_ DIR
MDO
MDI
MDC_ DIR
MDC_ OUT
MDC_IN
MDIO
MDC
Management
Mode Selection
MDO MDCLK MDI MDO_EnN
PMI
Parallel Slave
Figure 9.6 MII Mux Management Path Connections - PHY Mode I²C/SPI Managed
SMSC LAN9313/LAN9313i
133
DATASHEET
Revision 1.2 (04-08-08)