LAN91C100FD-SS

Controllers Overview

The LAN91C100FD-SS is a Fast Ethernet controller featuring a dual-speed CSMA/CD engine supporting 10 Mbps and 100 Mbps operation. It complies with IEEE 802.3 specifications for 10BASE-T, 100BASE-TX, and 100BASE-T4 interfaces. The device includes a 32-bit wide data path into packet buffer memory and supports 32, 16, and 8-bit CPU accesses. It offers synchronous, asynchronous, and burst DMA interface modes with support for up to 128 Kbytes of external memory. The controller provides full duplex capability via the Switched Full Duplex (SWFDUP) mode and utilizes a flat MMU architecture for symmetric transmit and receive structures.

Controllers Feature Summary

• Supports MII compliant MAC-PHY interface running at nibble rate
• Includes seven wire interface to 10 Mbps ENDEC
• Features EEPROM-based setup configuration
• Provides built-in transparent arbitration for slave sequential access

Controllers Applications

• First generation Fast Ethernet adapters
• Connectivity products requiring flexible slave interface
• Systems utilizing VESA local bus or EISA environments

Controllers Procurement Notes

Verify the ordering suffix -SS indicates a lead-free RoHS compliant package within the 208-pin QFP form factor. Confirm that the specific revision matches the required datasheet version for compatibility with existing drivers such as ODI, IPX, and NDIS in 16 and 32 bit Intel X86 based environments.

Controllers Selection Notes

Select this component when software compatibility with the LAN9000 family is required. Ensure the host system supports the necessary bus interfaces, including VL Local Bus or EISA burst mode DMA. Verify that the application can accommodate the 208-pin QFP package outline and provides the required 5V power supply rails for both digital and analog sections.

Controllers Part Context

This part belongs to the FEAST Fast Ethernet Controller family, specifically designed to facilitate first-generation Fast Ethernet implementations. It is functionally based on the LAN91C100 modified to add full duplex capability. The device maintains software compatibility with legacy LAN9000 drivers while offering enhanced performance through its unique MMU architecture and 32-bit data path.

Controllers Replacement Considerations

The standard LAN91C100-FD serves as the non-RoHS equivalent. For lead-free requirements, the LAN91C100-FD-SS is the direct substitute. Other variants include the LAN91C100-FD-ST for TQFP packages.