Filter
Top Products
Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i 11 Revision 1.22 (09-25-08)
DATASHEET
Chapter 1 Introduction
1.1 Block Diagrams
Figure 1.1 System Level Block Diagram
Figure 1.2 LAN9420/LAN9420i Internal Block Diagram
External
25MHz Crystal
GPIOs/LEDs
(optional)
EEPROM
(optional)
LAN9420/LAN9420i
PCI Host
PCI Device
PCI Device
Magnetics
To Ethernet
PCI Bus
LAN9420/LAN9420i
10/100
Ethernet
PHY
Ethernet
PLL
EEPROM
(optional)
GPIOs/LEDs
(optional)
25MHz
3.3V to 1.8V
Regulator
MAC Interface Layer
(MIL)
MAC
Ethernet MAC
PCI
PCI Target
PCI Master
PCI Bridge (PCIB)
TX DMA Engine
RX DMA Engine
DMA Controller
DMA Control &
Status Registers
(DCSR)
MAC Control & Status
Registers (MCSR)
TX FIFO (2KB)
RX FIFO (2KB)
TX COE
RX COE
+3.3V
Interrupt
Controller
(INT)
Power
Management
(PM)
System Control &
Status Registers
(SCSR)
EEPROM
Controller
(EPC)
GPIO/LED
Controller
(GPIO)
GP Timer
Free-Run
Counter
System Control Block (SCB)
Arbiter