LAN9218I_12 Datasheet, PDF (10/134 Pages) SMSC Corporation – High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support

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High-Performance Single-Chip 10/100 Ethernet Controller with HP Auto-MDIX and Industrial Temperature Support
Datasheet
Block Diagram
System Memory
System
Peripherals
Microprocessor/
Microcontroller
System Bus
LAN9218i
Magnetics
LEDS/
GPIO
Ethernet
1.2
25MHz
XTAL
EEPROM
(Optional)
Figure 1.1 System Block Diagram
The SMSC LAN9218i integrated 10/100 MAC/PHY controller is a peripheral chip that performs the
function of translating parallel data from a host controller into Ethernet packets. The LAN9218i Ethernet
MAC/PHY controller is designed and optimized to function in an embedded environment. All
communication is performed with programmed I/O transactions using the simple SRAM-like host
interface bus.
The diagram shown above, describes a typical system configuration of the LAN9218i in a typical
embedded environment.
The LAN9218i is a general purpose, platform independent, Ethernet controller. The LAN9218i consists
of four major functional blocks. The four blocks are:
„ 10/100 Ethernet PHY
„ 10/100 Ethernet MAC
„ RX/TX FIFOs
„ Host Bus Interface (HBI)
Compatibility with First-generation LAN9118 Family Devices
The LAN9218i is driver-, register-, and footprint-compatible with previous generation LAN9118 Family
devices. Drivers written for these products will work with the LAN9218i. However, in order to support
HP Auto-MDIX, other components such as the magnetics and the passive components around the
magnetics need to change, and supporting these changes does require a minor PCB change. A
reference design for the LAN9218i will be available on SMSC’s website.
Revision 2.9 (03-01-12)
10
DATASHEET
SMSC LAN9218i