PM42068B1-FEI

Overview

The PM42068B1-FEI is a Switchtec PAX Gen 4 Advanced Fabric PCIe switch from Microchip Technology. It provides high-performance, non-blocking switching with up to 174 GBps capacity and supports 68 lanes across 36 ports. The device features hot- and surprise-plug controllers for each port and allows flexible lane bifurcation to x1, x2, x4, x8, or x16 configurations. It integrates an embedded MIPS processor and comprehensive diagnostics including real-time eye capture and TLP analysis. Designed for scalable multi-host systems and SR-IOV sharing, it operates at PCIe Gen 4 speeds of 16 GT/s within a 40 mm × 40 mm package.

Feature Summary

• Supports multi-host sharing of SR-IOV endpoints and virtualization of entire PCIe domains
• Features advanced error containment mechanisms including AER, DPC, and CTS
• Includes integrated MIPS processor and extensive I/O interfaces for enclosure management
• Provides comprehensive diagnostics with built-in PCIe analyzer and real-time eye capture

Applications

• Scalable multi-host systems
• SR-IOV-enabled JBOFs
• Composable GP-GPU fabrics
• Disaggregated systems
• Rack scale architectures

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to ensure correct package dimensions and thermal characteristics. Confirm that the selected variant aligns with the required lane count and port configuration for the target system design. Cross-reference the datasheet revision date to ensure compatibility with current firmware tools and SDK versions.

Selection Notes

Select this model when 68 lanes and 36 ports are required for high-density interconnect applications. Consider the integrated MIPS processor if local fabric management without an external CPU is desired. Evaluate the available I/O interfaces, such as TWI and Ethernet MAC, to determine suitability for specific enclosure management requirements compared to other lane variants in the family.

Part Context

This component belongs to the Switchtec PAX Gen 4 Advanced Fabric PCIe Switch family, which includes models ranging from 28 to 100 lanes. The PAX series is designed to overcome limitations of traditional tree-based topologies by supporting complex fabric structures. It serves as a core interconnect solution for modern data center infrastructure requiring high bandwidth and low latency.

Replacement Considerations

Direct substitutes include other members of the PAX Gen 4 family such as the PM42052B1-F3EI (52 lanes) or PM42084B1-FEI (84 lanes), depending on specific lane and port requirements. Automotive qualified alternatives like the PM450xx series may be considered for extended temperature range applications.