Microchip Technology PM41100B-FEI

Overview

PM41100B-FEI from Microchip Technology is a Gen4 programmable PCIe switch IC with 100 lanes, 52 ports, 48 Non-Transparent Bridges (NTBs), and 26 virtual switch partitions-designed for high-reliability data center interconnects in PCIe SSD enclosures and pooled storage systems.

For engineers reviewing the PM41100B-FEI datasheet, PM41100B-FEI pinout, PM41100B-FEI application, or PM41100B-FEI equivalent, key selection criteria include lane count scalability, NTB assignment flexibility, upstream error containment (UEC), hot-plug controller per port, and integrated NVMe-MI enclosure management support.

Technical Context

The PM41100B-FEI implements a non-blocking Gen4 PCIe switch fabric with full 16 GT/s per lane compliance, supporting x1/x2/x4/x8/x16 port bifurcation without upstream/downstream port mapping restrictions. It integrates a MIPS processor for firmware execution and enables logical NT interconnect for multi-host topologies.

Its error containment architecture includes Downstream Port Containment (DPC) on all downstream ports, Completion Timeout Synthesis (CTS), and programmable Upstream Error Containment (UEC). Each of its 52 ports features dedicated hot- and surprise-plug controllers and configurable GPIOs for cable/connector standards.

Key Specifications

Pinout & Package

PM41100B-FEI is housed in a 27 mm × 27 mm, 780-pin FC-BGA package (package code: F-EI), with ball pitch of 1.0 mm and RoHS-compliant finish. Pin functions are defined per Microchip's DS00003308B Rev B, including dedicated SERDES banks, reference clock inputs, JTAG/EJTAG debug interface, and power/ground distribution optimized for Gen4 signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar programmable PCIe switch applications.

Compared with Intel PEX89000 and AMD Pensando P2000, the PM41100B-FEI uniquely integrates NVMe-MI, 26 virtual partitions, and per-port UEC-making it optimal for self-contained, high-availability NVMe JBOD and multi-host pooling where hardware-enforced isolation and enclosure intelligence are critical.

Availability

PM41100B-FEI is available at Aetrix Electronics and suitable for PCIe SSD enclosures, multi-host storage pooling, and high-density server backplanes requiring stable component supply, long-term lifecycle support, and validated Gen4 signal integrity performance.

Supply support for PM41100B-FEI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global semiconductor company specializing in microcontrollers, analog, FPGA, and connectivity solutions, with a strong focus on reliability, security, and long-life product support.

The Switchtec PSX Gen4 family-including PM41100B-FEI-is engineered for high-availability data center infrastructure, delivering programmable PCIe switching with integrated enclosure management, advanced error containment, and hardware-accelerated NTB routing.

FAQ

What is the maximum number of Non-Transparent Bridges supported by the PM41100B-FEI?

The PM41100B-FEI supports up to 48 Non-Transparent Bridges (NTBs), all assignable to any of its 52 ports. This capability enables secure, memory-mapped peer-to-peer communication between multiple hosts in pooled storage or AI cluster architectures. The PM41100B-FEI's NTB allocation is fully programmable via its integrated MIPS processor and Switchtec SDK, allowing dynamic reconfiguration without hardware changes.

Does the PM41100B-FEI include built-in support for NVMe enclosure management?

Yes, the PM41100B-FEI integrates an NVMe-MI controller supporting both in-band management (via PCIe using SES-2 and native NVMe Enclosure Services) and out-of-band management (via MCTP over I²C). This eliminates the need for external BMCs in JBOD designs. The PM41100B-FEI's firmware stack handles slot status, temperature, power, and LED control directly-reducing system complexity and BOM cost.

What package type and pin count does the PM41100B-FEI use?

The PM41100B-FEI uses a 27 mm × 27 mm, 780-ball Fine-Pitch Flip-Chip Ball Grid Array (FC-BGA) package with 1.0 mm ball pitch and Pb-free RoHS-compliant finish (package code: F-EI). Its layout separates high-speed SERDES banks from power/ground balls to maintain Gen4 signal integrity. The PM41100B-FEI's pinout is documented in Microchip's DS00003308B Rev B.

How does the PM41100B-FEI handle PCIe link errors to prevent system instability?

The PM41100B-FEI implements multiple hardware-level error containment mechanisms: Downstream Port Containment (DPC), Completion Timeout Synthesis (CTS), and programmable Upstream Error Containment (UEC). These features isolate faulty links or endpoints before errors propagate to upstream hosts. The PM41100B-FEI's AER reporting and real-time diagnostics further enable rapid root-cause analysis without host OS intervention.

Is the PM41100B-FEI compatible with PCIe Gen3 systems?

Yes, the PM41100B-FEI is fully backward-compatible with PCIe Gen3 and Gen2 systems through automatic link training and speed negotiation. It operates at 8 GT/s in Gen3 mode and 5 GT/s in Gen2 mode while retaining all features-including NTB assignment, virtual partitions, and error containment. System designers can deploy the PM41100B-FEI in mixed-generation environments without sacrificing functionality or reliability.