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LAN91C100FD

10/100 Base-T/TX Ethernet Controller with 16/32 Bit Interface

Status: Not Recommended for new designs

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
  • 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
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

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.


*The LANCheck online design review service is subject to Microchip's Program Terms and Conditions and requires a myMicrochip account.

Please consider this device LAN9217, LAN9218

Additional Features

    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
    • 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
Parametrics
Name
Value
Description
10Base-T/100Base-TX Ethernet Controller with 16/32 bit interface
Ethernet Bandwidth
10/100Mbps
MAC
Yes
PHY
Yes
TX/RX RAM Buffer(Bytes)
External 128K
Interrupt Pin
1
# Ethernet Ports
1
Temp. Range Max. (°C)
70
Interface
16-bit or 32-bit
Vdd I/O (V)
5

Documents

Jump to:

Development Environment

  • Software Libraries
Software Libraries
LAN9000 BSD drivers for vxWorks (BSD 4.3, 4.4 and END)

LAN9000 BSD drivers for vxWorks (BSD 4.3, 4.4 and END)

Learn More
LAN9000 Diagnostic and Setup Utilities (ETX, ISMC9000, MIIPHY, CIS and ENABLERS

LAN9000 Diagnostic and Setup Utilities (ETX, ISMC9000, MIIPHY, CIS and ENABLERS

Learn More
LAN9000 FreeBSD Unix Drivers. ISA Adapters. Source Code tar-gzipped

LAN9000 FreeBSD Unix Drivers. ISA Adapters. Source Code tar-gzipped

Learn More
LAN9000 ISA and PCMCIA Drivers for Windows CE 2.1x for x86 Processor - v1.30

LAN9000 ISA and PCMCIA Drivers for Windows CE 2.1x for x86 Processor - v1.30

Learn More
LAN9000 Linux Drivers. PCMCIA Adapters. Source Code tared

LAN9000 Linux Drivers. PCMCIA Adapters. Source Code tared

Learn More
LAN9000 NDIS2 Drivers for DOS/Win3.X and OS2. ISA, FEAST, PCMCIA Single and Dual Function Adapters

LAN9000 NDIS2 Drivers for DOS/Win3.X and OS2. ISA, FEAST, PCMCIA Single and Dual Function Adapters

Learn More
LAN9000 NDIS3 and NDIS4 Drivers for Win95/Win98/WinNT/Win2k. ISA, FEAST, PCMCIA Single and Dual Function Adapters

LAN9000 NDIS3 and NDIS4 Drivers for Win95/Win98/WinNT/Win2k. ISA, FEAST, PCMCIA Single and Dual Function Adapters

Learn More
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

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

Learn More
LAN9000 SCO Unix Drivers. ISA Adapters. Source Code tared

LAN9000 SCO Unix Drivers. ISA Adapters. Source Code tared

Learn More
Linux Drivers

Linux Drivers

Learn More
SRC-9000 Source Code

SRC-9000 Source Code

Learn More
SRC-9000-CE Source Code

SRC-9000-CE Source Code

Learn More
SRC-9000-CENET86 Source Code

SRC-9000-CENET86 Source Code

Learn More

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
LAN91C100FD-SS
5.572700
9.166667
208
QFP
28x28x3.4
Matte Tin
e3
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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