LAN91C93I-MS

Controllers Overview

The LAN91C93I-MS is a non-PCI single-chip full duplex Ethernet controller manufactured by Microchip Technology (originally SMSC). It integrates MAC and physical layer functions for 10BASE-T networks, including an integrated transceiver. The device features 6K bytes of on-chip packet RAM and supports IEEE 802.3 standards with full duplex switched Ethernet capabilities. It utilizes a local bus interface with 16-bit data and control paths, offering direct connection without wait states. The component operates within an industrial temperature range of -40°C to +85°C and accepts a single power supply voltage of either 5V or 3.3V.

Controllers Feature Summary

• Integrates a hardware Memory Management Unit (MMU) for dynamic memory allocation between transmit and receive queues, eliminating the need for DMA services.
• Supports simultaneous early transmit and early receive functions with enhanced queue management for high-performance back-to-back packet handling.
• Includes automatic detection of TX/RX polarity reversal and link integrity test functions within the integrated twisted pair transceiver.
• Allows optional configuration via a serial EEPROM interface for jumperless setup of network parameters.

Controllers Applications

• Network Interface implementations requiring 10BASE-T connectivity
• Local bus based embedded systems needing non-PCI Ethernet integration
• Industrial environments requiring operation across extended temperature ranges

Controllers Procurement Notes

Verify the specific ordering suffix MS indicates the green, lead-free package variant in the 100-pin QFP format. Confirm that the design supports the required local bus timing constraints and voltage levels. Ensure compatibility with existing software drivers designed for the LAN91C9x series. Check for any necessary external components for the crystal oscillator and EEPROM interface as per the datasheet recommendations.

Controllers Selection Notes

Select this component when a local bus interface is preferred over PCI or MII connections. It is suitable for applications requiring integrated PHY functionality without external transceivers for twisted pair media. Consider the 6K byte RAM size for buffering requirements in full duplex scenarios. Verify that the host processor can support the 16-bit local bus architecture and the associated I/O space mapping defined in the register map.

Controllers Part Context

The LAN91C93I belongs to the LAN91C9x family of Ethernet controllers, which are designed for local bus environments. It is functionally compatible with the LAN91C92, LAN91C94, and LAN91C96 in local bus mode. The LAN91C93I specifically adds full duplex support and increased packet RAM compared to earlier variants in the series.

Controllers Replacement Considerations

LAN91C93I-MC: Same functional specifications but housed in a standard 100-pin QFP package rather than the green, lead-free version.

Controllers FAQ

Does the LAN91C93I-MS require DMA for operation?

No, the LAN91C93I does not use DMA services. It utilizes a buffered architecture and a hardware Memory Management Unit (MMU) to manage packet transfers directly through the local bus interface.

What is the maximum operating temperature for the LAN91C93I-MS?

The LAN91C93I-MS supports an industrial temperature range with a maximum operating temperature of +85°C.

Can the LAN91C93I interface with external transceivers?

Yes, while it integrates a 10BASE-T transceiver, it also provides an AUI interface to connect to external transceivers for 10BASE5, 10BASE2, or 10BASE-F implementations.