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LAN9313 Datasheet(PDF) 128 Page - SMSC Corporation

Part # LAN9313
Description  Three Port 10/100 Managed Ethernet Switch with MII
PDF  398 Pages
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Manufacturer  SMSC [SMSC Corporation]
Direct Link  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN9313 Datasheet(HTML) 128 Page - SMSC Corporation

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Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
Revision 1.2 (04-08-08)
128
SMSC LAN9313/LAN9313i
DATASHEET
9.4
MII Mode Multiplexer
The MII mode multiplexer is used to direct the MII data/management path connections. One master
(MAC via the MII pins, or PMI) is connected to the slaves (PHY via MII pins, Port 1/2 PHYs, Virtual
PHY, and SMI slave) dependant on the selected management mode of the LAN9313/LAN9313i. The
MII mode multiplexer also performs the multiplexing of the read data signals from the slaves and
controls the output enable of the MII pins.
The following sections detail the operation of the MII mode multiplexer in each management mode. A
list of management modes and their configuration settings are discussed in Section 2.3, "Modes of
Operation," on page 23.
9.4.1
MAC Mode Unmanaged
In MAC mode unmanaged, no external accesses to the LAN9313/LAN9313i are required. The MII
multiplexer is disabled and the MII management pins are not driven.
The Virtual PHY interface is accessible via the EEPROM Loader. Refer to Section 8.2.4, "EEPROM
Loader," on page 113 for additional information.
Figure 9.1 details the MII multiplexer management path connections for this mode.
Figure 9.1 MII Mux Management Path Connections - MAC Mode Unmanaged
SMI Slave
MDI
MDO
MDIO_ DIR
MDCLK
Parallel
Master
Virtual PHY
MDI
MDO
MDIO_ DIR
MDCLK
Parallel
Slave
PHY2
MDI
MDO
MDIO_ DIR
MDCLK
PHY1
MDI
MDO
MDIO_ DIR
MDCLK
Management
Mode Selection
MII Pins
MDI
MDO
MDIO_DIR
MDC_IN
MDC_ OUT
MDC_DIR
Management
Mode Selection
PMI
MDI
MDO MDCLK
Parallel Slave
MDO_EnN
MDIO
MDC



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