
21145 Phoneline/Ethernet LAN 
Controller
Preliminary
 Datasheet
Product Features
HomePNA Features
I
 Compliant with the 
Home Phoneline 
Networking Alliance
 (HomePNA*)
Specification effort.
I
 Integrates a HomePNA PHY for 1 Mb/s 
Ethernet-like home networking on 
telephone lines.
I
 Provides automatic support for dual 
HomePNA data transfer rates and dual 
transmission power levels.
I
 Supports autodetection between 
10BASE-T, HomePNA and MII/SYM 
ports.
I
 Generates an interrupt upon HomePNA 
PHY interrupt.
I
 Provides a software interface to the 
HomePNA PHY internal registers.
Power Management and Power 
Saving Features
I
 Fully compliant with the 
Network Device 
Class Power Management Specification
, 
Revision 1.0, and the 
Communication 
Device Class Power Management 
Specification
, under the OnNow 
Architecture for Microsoft’s 
PC97 Design 
Guide
, 
PC 98 Hardware Design Guide, and 
PC 99 Hardware Design Guide
.
I
 Supports all wake-up events defined in the 
Network Device Class Power Management 
Specification
, Revision 1.0 and the 
Communication Device Class Power 
management Specification.
I
 Fully compliant with the 
Advanced 
Configuration and Power Interface
 (ACPI) 
Specification
, Revision 1.0
I
 Fully compliant with the 
PCI Bus Power 
Management Interface Specification
, 
Revision 1.0.
PCI and CardBus Features
I
 Supports PCI and CardBus interfaces for 
network and modem access.
I
 Supports CardBus cstschg pin and Status 
Changed registers.
I
 Supports storage of CardBus card 
information structure (CIS) in the serial 
ROM or the expansion ROM.
Host Interface Features
I
 Includes a powerful onchip direct memory 
access (DMA) with programmable burst 
size, providing low CPU utilization.
I
 Supports interrupt mitigation on transmit 
and receive.
I
 Contains large independent receive and 
transmit FIFOs.
Network Side Features
I
 Supports three network ports: 10BASE-T 
(10 Mb/s), HomePNA (1 Mb/s), and 
MII/SYM (10/100 Mb/s).
I
 Supports autodetection between 
10BASE-T, HomePNA, and MII/SYM 
ports.
I
 Supports full-duplex operation on both 
MII/SYM and 10BASE-T ports.
I
 Provides internal and external loopback 
capability on all network ports.
I
 Supports IEEE 802.3 and ANSI 8802-3 
Ethernet standards.
Other Features
I
 Provides MicroWire* interface for serial 
ROM (1 K and 4 K EEPROM).
I
 Incorporates a modem interface that 
connects to a wide range of modem 
chipsets available in the marketplace.
Order Number: 278256-001
April 1999
Notice:
 This document contains preliminary information on new products in production. The 
specifications are subject to change without notice. Verify with your local Intel sales office that 
you have the latest datasheet before finalizing a design.