• 简体中文
• English

LAN91C100FD

Please consider this device

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.

Documents

LAN91C100FD Rev. D FEAST Fast Ethernet Controller with Full Duplex Capability D	Data Sheets	09/22/2008	496KB
AN2157 - Transient Protection in Power Over Ethernet Applications	AppNote	05/24/2016	229KB
AN6.14 - Migrating from LAN91C100 (FEAST) to LAN91C100FD (FEAST Full Duplex)	AppNote	06/10/2008	161KB
AN6.20 - LAN91C100 and LAN91C100FD Design Consideration with Quality Semiconductor QSI6612	AppNote	06/10/2008	152KB
AN8.10 - LAN91C100FD Rev. B/LAN91C110 Rev. A Minimum SRAM Access Time Requirement and a List of Recommended SRAMs	AppNote	11/19/2008	175KB
AN8.5 - Migrating from LAN91C100FD (FEAST FD) to LAN91C110 (Reduced-Pin-Count FEAST FD)	AppNote	07/17/2008	154KB
AN9.11 - Understanding the Chip ID and Revision Registers	AppNote	08/07/2001	110KB
LAN9000 BSD drivers for vxWorks (BSD 4.3, 4.4 and END)	Software Library	01/31/2014
LAN9000 Diagnostic and Setup Utilities (ETX, ISMC9000, MIIPHY, CIS and ENABLERS	Software Library	02/06/2014
LAN9000 FreeBSD Unix Drivers. ISA Adapters. Source Code tar-gzipped	Software Library	01/31/2014
LAN9000 ISA and PCMCIA Drivers for Windows CE 2.1x for x86 Processor - v1.30	Software Library	01/31/2014
LAN9000 Linux Drivers. PCMCIA Adapters. Source Code tared	Software Library	01/31/2014
LAN9000 NDIS2 Drivers for DOS/Win3.X and OS2. ISA, FEAST, PCMCIA Single and Dual Function Adapters	Software Library	01/31/2014
LAN9000 NDIS3 and NDIS4 Drivers for Win95/Win98/WinNT/Win2k. ISA, FEAST, PCMCIA Single and Dual Function Adapters	Software Library	01/31/2014
LAN9000 Netware Server (2.X, 3.X, 4.X), DOS/Win3.X and OS/2 Netware Clients. ISA, FEAST, PCMCIA Single and Dual Function Adapter	Software Library	01/31/2014
LAN9000 SCO Unix Drivers. ISA Adapters. Source Code tared	Software Library	01/31/2014
Linux Drivers	Software Library	01/31/2014
SRC-9000 Source Code	Software Library	02/06/2014
SRC-9000-CE Source Code	Software Library	02/06/2014
SRC-9000-CENET86 Source Code	Software Library	02/06/2014
LAN91C100FD Rev. D FEAST Fast Ethernet Controller with Full Duplex Capability D	Product Briefs	09/22/2008	219KB
LAN9000 Diagnostic and Setup Utilities (ETX, ISMC9000, MIIPHY, CIS and ENABLERS	Schematics	06/15/2007	301KB
LAN91C100 Hardware Design Info	Schematics	10/30/1996	871KB
LAN91C100FD MII Fast Ethernet ISA Board Schematic	Schematics	06/15/1996	35KB

Similar Devices

RoHS Information

PartNumber	DeviceWeight	ShippingWeight	LeadCount	PackageType	PackageWidth	SolderComposition	JEDECIndicator	RoHS	ChinaEFUP
LAN91C100FD-SS		9.166667	208	QFP	28x28x3.4	Matte Tin	e3