LAN91C100FD General Description
	Data Sheet, Application Notes, Drivers and Design Tools

Features

	Dual Speed CSMA/CD Engine (10 Mbps and 100 Mbps)
	Compliant with IEEE 802.3 100BASE-T Specification
	Supports 100BASE-TX, 100BASE-T4, and 10BASE-T Physical Interfaces
	32 Bit Wide Data Path (into Packet Buffer Memory)
	Support for 32 and 16 Bit Buses
	Support for 32, 16, and 8 Bit CPU Accesses
	Synchronous, Asynchronous, and Burst DMA Interface Mode Options
	128 Kbyte External Memory
	Built-In Transparent Arbitration for Slave Sequential Access Architecture
	Early TX, Early RX Functions
	Flat MMU Architecture with Symmetric Transmit and Receive Structures and Queues
	MII (Media Independent Interface) Compliant MAC-PHY Interface Running at Nibble Rate
	MII Management Serial Interface
	Seven Wire Interface to 10 Mbps ENDEC
	EEPROM-Based Setup
	Full Duplex Capability

General Description

The LAN91C100FD is designed to facilitate the implementation of first generation Fast Ethernet adapters and connectivity products. For this first generation of products, flexibility dominates over integration. The LAN91C100FD is a digital device that implements the MAC portion of the CSMA/CD protocol at 10 and 100 Mbps, and couples it with a lean and fast data and control path system architecture to ensure the CPU to packet RAM data movement does not cause a bottleneck at 100 Mbps.

Total memory size is 128 Kbytes, equivalent to a total chip storage (transmit plus receive) of 64 outstanding packets. The LAN91C100FD is software compatible with the LAN9000 family of products and can use existing LAN9000 drivers (ODI, IPX, and NDIS) in 16 and 32 bit Intel X86 based environments.

Memory management is handled using a unique MMU (Memory Management Unit) architecture and a 32-bit wide data path. This I/O mapped architecture can sustain back-to-back frame transmission and reception for superior data throughput and optimal performance. It also dynamically allocates buffer memory in an efficient buffer utilization scheme, reducing software tasks and relieving the host CPU from performing these housekeeping functions. The total memory size is 128 Kbytes (external), equivalent to a total chip storage (transmit and receive) of 64 outstanding packets.

FEAST provides a flexible slave interface for easy connectivity with industry-standard buses. The Bus Interface Unit (BIU) can handle synchronous as well as asynchronous buses, with different signals being used for each one. FEAST's bus interface supports synchronous buses like the VESA local bus, as well as burst mode DMA for EISA environments. Asynchronous bus support for ISA is supported even though ISA cannot sustain 100 Mbps traffic. Fast Ethernet could be adopted for ISA-based nodes on the basis of the aggregate traffic benefits.

Two different interfaces are supported on the network side. The first is a conventional seven wire ENDEC interface that connects to the LAN83C694 for 10BASE-T and coax 10 Mbps Ethernet networks. The second interface follows the MII (Media Independent Interface) specification draft standard, consisting of 4 bit wide data transfers at the nibble rate. This interface is applicable to 10 Mbps or 100 Mbps networks. Three of the LAN91C100FD's pins are used to interface to the two-line MII serial management protocol. Four I/O ports (one input and three output pins) are provided for LAN83C694 configuration.

The LAN91C100FD is based on the LAN91C100 FEAST, functional revision G modified to add full duplex capability. Also added is a software-controlled option to allow collisions to discard receive packets. Previously, the LAN91C100 supported a "Diagnostic Full Duplex" mode. Under this mode the transmit packet is looped internally and received by the MAC. This mode was enabled using the FDUPLX bit in the TCR. In order to avoid confusion, the new, broader full duplex function of the LAN91C100FD is designated as Switched Full Duplex, and the TCR bit enabling it is designated as SWFDUP. When the LAN91C100FD is configured for SWFDUP, its transmit and receive paths will operate independently and some CSMA/CD functions will be disabled. When the controller is not configured for SWFDUP it will follow the CSMA/CD protocol.

LAN91C100FD Data Sheet, Application Notes,
Drivers and Design Tools

Description	File Name	File Size	Date
LAN91C100FD Rev. B Data Sheet	91c100fdrevb.pdf	362K	3/28/07
LAN91C100FD Rev. D Data Sheet	91c100fdrevd.pdf	448K	1/20/06
Evaluation Boards	EVB9000-102 EVB9000-180
Reference Design Files
LAN91C100FD MII Fast Ethernet ISA Board Schematic	91c100fdmii.pdf	36K	6/15/96
LAN91C100 Hardware Design	feasth.zip	871K	10/30/96
LAN83C180 10/100 Ethernet PHY Adapter Reference Design	180_mii.pdf	22K	8/14/98
LAN9000 Diagnostic/Setup Utilities	utility.zip	302K	6/15/07
Application Notes
Application Note 6-1: Low Level Ethernet Diagnostic Tools - ETX.EXE Debug Software	an61.pdf	222K	7/17/07
Application Note 6-14: Migrating from LAN91C100 (FEAST) to LAN91C100FD (FEAST Full Duplex)	an614.pdf	100K	9/24/96
Application Note 6-20: LAN91C100 and LAN91C100FD Design Considerations in 10 Mbps Half Duplex Mode	an620.pdf	114K	11/28/00
Application Note 8-2: SMSC LAN91C100 and LAN91C110 FEAST Competitive Comparison in Embedded and PC Card Applications	an82.pdf	218K
Application Note 8-5: Migrating from LAN91C100FD (FEAST FD) to LAN91C110 (Reduced-Pin-Count FEAST FD) - Software Modifications in Drivers and Utilities	an85.pdf	96K	11/17/98
Application Note 8-10: LAN91C100FD/LAN91C110 Minimum SRAM Access Time Requirement and a List of Recommended SRAMs	an810.pdf	125K	2/1/00
Application Note 9-5: Migrating from LAN91C100FD and LAN83C183 to LAN91C111	an95.pdf	155K	8/24/01
Application Note 9-8: I/O-Based (Non-DMA) Non-PCI Embedded Ethernet Solutions	an98.pdf	126K	9/27/01
Application Note 9-11: Understanding the Chip ID and Revision Registers	an911.pdf	111K	8/6/01
Drivers
Linux Drivers	linux9.tar.gz smc9_pcm.tar	16K 120K	8/20/98 8/20/98
Microsoft Drivers     NDIS 2 for Windows for Workgroups         & OS/2     NDIS 3/NDIS 4 for Windows 95, Windows         NT 4.0, Windows 98, & Windows 2000     NDIS 4 for Windows CE 2.1x	ndis2.zip ndis3-4.zip ce9000.zip	121K 443K 63K	8/20/98 6/30/00 10/27/99
Novell Drivers     DOS-ODI & OS/2, Server	novell.zip	501K	5/26/00
SCO Drivers	s9192.tar	210K	8/20/98
FreeBSD Unix Drivers	smc9k.tar.gz	17K	8/20/98
VxWorks Drivers	vx9000.zip	158K	5/26/00
Source Code
Download SRC-9000-CE	SRC-9000-CE
Download SRC-9000-CENET86	SRC-9000-CENET86
Download SRC-9000	SRC-9000
Other Information
Object Code	Unlimited royalty-free distribution rights when offered with SMSC controller
Anomaly	Contact your local SMSC representative
Using the Adobe® Acrobat® Reader	aacrobat.html