lan9313 Standard Microsystems Corp., lan9313 Datasheet - Page 128
lan9313
Manufacturer Part Number
lan9313
Description
Lan9313/lan9313i Three Port 10/100 Managed Ethernet Switch With Mii
Manufacturer
Standard Microsystems Corp.
Datasheet
1.LAN9313.pdf
(398 pages)
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Revision 1.2 (04-08-08)
9.4
9.4.1
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
Operation," on page
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
Loader," on page 113
Figure 9.1
MII Mode Multiplexer
Figure 9.1 MII Mux Management Path Connections - MAC Mode Unmanaged
MDI
MDCLK
MDI
MDCLK
MDI
MDCLK
MDI
MDCLK
Virtual PHY
details the MII multiplexer management path connections for this mode.
SMI Slave
Mode Selection
PHY2
PHY1
Management
Parallel
Parallel
Master
Slave
MDIO_ DIR
MDIO_ DIR
MDIO_ DIR
MDIO_ DIR
MDO
MDO
MDO
MDO
23.
for additional information.
DATASHEET
128
Mode Selection
Management
MDO MDCLK
Parallel Slave
PMI
Three Port 10/100 Managed Ethernet Switch with MII
MDI
MDO_EnN
MDIO_DIR
MDO
MDI
MDC_DIR
MDC_ OUT
MDC_IN
Section 8.2.4, "EEPROM
MII Pins
SMSC LAN9313/LAN9313i
Section 2.3, "Modes of
MDIO
MDC
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