LAN9303 Datasheet, PDF (16/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

2.2
Block Diagram
MII/Turbo MII to PHY or
MII/RMII/Turbo MII to MAC
Ethernet
10/100
PHY
Registers
MDIO
MII
Ethernet
10/100
PHY
Registers
MII
MDIO
10/100
MAC
10/100
MAC
Switch Engine
Buffer Manager
Search
Engine
Frame
Buffers
10/100
MAC
Switch Fabric
Switch
Registers
(CSRs)
MII
Data
Path
Mode Configuration
Straps
System
Registers
(CSRs)
Register
Access
MUX
Virtual PHY
Registers
MDIO
PHY Management ^MDIO
Interface (PMI)
MII
Mode
MUX
MDIO
SMI (slave)
Controller
MDIO
I²C Slave
Controller
To optional SMI Master
Mode Configuration
Straps
EEPROM Loader
LAN9303/
LAN9303i
GPIO/LED
Controller
System
Interrupt
Controller
System _{GP Timer}
Clocks/
Reset/PME _Free-Run
Controller Clk
EEPROM Controller
I²C
I²C (master)
To optional GPIOs/LEDs
IRQ
External
25MHz Crystal
Figure 2.1 Internal Block Diagram
To optional EEPROM
(via I²C master)
To optional CPU
serial management
(via I²C slave)