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Microchip Technology PM41068B-FEI
- Part No.:
- PM41068B-FEI
- Manufacturer:
- Microchip Technology
- Category:
- Specialized
- Package:
- 1467-BBGA
- Datasheet:
-
PM41068B-FEI.pdf
- Description:
- PCIE SWITCH GEN4 BBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
PM41068B-FEI from Microchip Technology is a Gen4 programmable PCIe switch with 68 lanes, 36 physical ports (34 NTBs), 18 virtual switch partitions, and integrated hot-plug controllers for all 36 ports. It implements end-to-end data integrity protection, supports x1/x2/x4/x8/x16 port bifurcation, and serves as the core switching fabric in NVMe SSD enclosures and pooled storage systems.
For engineers reviewing the PM41068B-FEI datasheet, PM41068B-FEI pinout, PM41068B-FEI application, or PM41068B-FEI equivalent, key selection criteria include lane count scalability, NTB assignment flexibility, upstream error containment (UEC), real-time eye capture capability, and NVMe-MI enclosure management support via in-band SES/native NVMe and out-of-band MCTP over I²C.
Technical Context
The PM41068B-FEI implements a non-blocking PCIe Gen4 switch architecture with 16 GT/s SERDES, supporting full link training compliance and manual PHY configuration-including for optical interconnects. Its integrated MIPS processor enables on-device firmware execution for enclosure management and error containment logic.
It delivers advanced reliability features including Downstream Port Containment (DPC) on all downstream ports, Completion Timeout Synthesis (CTS) to prevent upstream host lockup, and programmable Upstream Error Containment (UEC). The device also integrates a high-performance DMA engine with ultra-low latency for peer-to-peer data movement across NTBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Lane Count | 68 PCIe Gen4 lanes - enables scalable topology with up to x16 upstream links and flexible downstream aggregation |
| Physical Ports / NTBs | 36 ports / 34 Non-Transparent Bridges - allows independent memory-mapped interconnect between hosts and endpoints without shared address space |
| Virtual Partitions | 18 virtual switch partitions - supports multi-tenant isolation and resource allocation in shared infrastructure |
| Hot-Plug Controllers | 36 dedicated controllers - enables safe insertion/removal of PCIe devices per port without system reset |
| PCIe Speed | Gen4 (16 GT/s) - provides 2 GB/s per x1 lane, doubling bandwidth over Gen3 for high-throughput storage fabrics |
| Error Containment | UEC + DPC + CTS - prevents error propagation across domains and avoids upstream host hang due to incomplete transactions |
| Management Interface | NVMe-MI with SES & native NVMe stack + MCTP over I²C - enables unified in-band and out-of-band enclosure monitoring and control |
Pinout & Package
PM41068B-FEI is housed in a 27 mm × 27 mm, 780-pin FC-BGA package (package code: F3EI per Microchip ordering guide). Pin functions are defined in Microchip Document DS00003308B, Section 3.1 "Pin Descriptions".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLK_IN[0:1] | PCIe Reference Clock Input | Differential 100 MHz input for SERDES PLL lock; required for Gen4 link initialization |
| PERST# | PCIe Reset Input | Active-low global reset signal controlling configuration space and link state machine |
| PRSNT#_A/B[0:35] | Presence Detect | Per-port presence detection for hot-plug event generation and slot power sequencing |
| I2C_SDA/SCL | Management I²C Bus | Supports MCTP-based out-of-band communication with baseboard management controller (BMC) |
| SGPIO_CLK/DATA[0:3] | SGPIO Interface | Drives LED status indicators and receives backplane activity signals per SFF-8485 |
| JTAG_TCK/TMS/TDI/TDO | Boundary Scan Interface | Enables IEEE 1149.1-compliant testing, debug, and firmware programming during production and field service |
Key Features
| Feature | Design Value |
|---|---|
| Real-time Eye Capture | On-die oscilloscope function enabling signal integrity validation without external test equipment during bring-up and field diagnostics |
| Flexible Port Bifurcation | Any port configurable as x1/x2/x4/x8/x16 - eliminates fixed topology constraints and supports mixed endpoint configurations |
| Integrated NVMe Controller | Hardware-accelerated NVMe-MI command processing - offloads BMC and reduces firmware complexity in SSD enclosures |
| Programmable UEC | Configurable upstream error blocking per port - isolates faulty downstream devices before errors corrupt host memory or CPU state |
| PSX SDK Support | Full source access to Switchtec PSX Software Development Kit - enables customer-specific error handling, surprise-plug policies, and custom partitioning logic |
Applications
| NVMe SSD Enclosure Management | Pooled Compute/Storage Fabric |
|---|---|
Use Scenario: 2U rack-mount NVMe JBOD with 24 hot-swappable U.2 drives, managed by a single BMC. IC Role / Device Role / Timing Role: PCIe switch and embedded enclosure manager - routes host PCIe traffic to drives while executing SES/NVMe-MI commands and monitoring thermal/power events. Use Value: Eliminates external microcontroller; reduces BOM cost and board area by integrating NVMe-MI controller, I²C/MCTP, SGPIO, and GPIOs into PM41068B-FEI. | Use Scenario: Disaggregated server architecture where CPU, GPU, and storage resources are physically separated but interconnected via PCIe. IC Role / Device Role / Timing Role: High-reliability fabric switch - provides non-transparent bridging between multiple hosts and shared accelerators or NVMe arrays with strict fault isolation. Use Value: Enables secure, low-latency peer-to-peer DMA transfers across NTBs while preventing error propagation via UEC and DPC - critical for uptime in cloud infrastructure. |
| Multi-Host Flash Array | Blade Server Backplane |
Use Scenario: Enterprise flash array with dual active-active controllers, each connected to 16 NVMe SSDs via separate PCIe root complexes. IC Role / Device Role / Timing Role: Dual-role switch - operates as upstream-facing endpoint to controllers and downstream-facing root complex to SSDs, with 18 virtual partitions enforcing QoS and tenant separation. Use Value: Supports 1+1 failover and seamless controller switchover without PCIe link retraining - ensures sub-50ms recovery for mission-critical storage SLAs. | Use Scenario: 10-blade chassis where each blade exposes x16 PCIe to a central backplane, aggregated into a unified 68-lane fabric. IC Role / Device Role / Timing Role: Centralized PCIe aggregation switch - consolidates 36 blade links into fewer high-speed uplinks to host servers or storage controllers. Use Value: Reduces cable count and backplane complexity; leverages x11/x2/x4/x8/x16 bifurcation to match heterogeneous blade capabilities without redesigning PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable PCIe switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PM41084B-FEI | 84 lanes, 44 ports / 42 NTBs, 22 partitions - higher port density and NTB count than PM41068B-FEI | Targeted at larger-scale enclosures (e.g., 4U 48-drive systems) requiring more upstream bandwidth and partitioning granularity | Select when scaling beyond 36 ports or needing >18 virtual partitions without cascading switches |
| PM41052B-F3EI | 52 lanes, 28 ports / 26 NTBs, 14 partitions - smaller footprint and lower power than PM41068B-FEI | Suitable for edge storage appliances or compact OCP-compliant servers with constrained thermal envelope | Choose for cost- and power-sensitive deployments where 68 lanes would be underutilized |
Compared with PM41084B-FEI and PM41052B-F3EI, the PM41068B-FEI delivers optimal balance of lane count, NTB capacity, and virtual partitioning for mid-density NVMe enclosures-avoiding over-provisioning while retaining headroom for future expansion or mixed x8/x16 configurations.
Availability
PM41068B-FEI is available at Aetrix Electronics and suitable for NVMe SSD enclosures, pooled compute/storage fabrics, multi-host flash arrays, and blade server backplanes requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for PM41068B-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 U.S.-based semiconductor company specializing in microcontrollers, analog, FPGA, and connectivity solutions, with emphasis on reliability, security, and long-life product support.
The Switchtec PSX Gen4 family-including PM41068B-FEI-is designed specifically for high-availability PCIe switching in data center storage infrastructure, emphasizing error containment, NVMe-MI integration, and software-defined topology management.
FAQ
What is the maximum number of Non-Transparent Bridges supported by the PM41068B-FEI?
The PM41068B-FEI supports up to 34 Non-Transparent Bridges (NTBs), assignable to any of its 36 physical ports. This enables isolated memory-mapped interconnects between multiple hosts and endpoints-critical for secure multi-tenant storage systems. Each NTB operates independently with dedicated address translation and error isolation, and the PM41068B-FEI's firmware enforces strict boundary enforcement across all 34 NTBs.
Does the PM41068B-FEI include an integrated processor, and what is its role?
Yes, the PM41068B-FEI integrates a MIPS-based embedded processor used for running Switchtec firmware, managing NVMe-MI commands, executing error containment policies, and handling hot-plug state machines. This processor eliminates the need for an external microcontroller in enclosure management applications, and the PM41068B-FEI SDK provides full access to its runtime environment for customer customization.
How does the PM41068B-FEI support NVMe-MI enclosure management?
The PM41068B-FEI supports NVMe-MI through both in-band and out-of-band paths: in-band uses the native NVMe command set and SES protocol over PCIe; out-of-band uses MCTP over I²C. It includes a hardware-accelerated NVMe-MI controller that processes commands directly-reducing latency and offloading the BMC. This dual-path capability is fully implemented in the PM41068B-FEI and validated per NVMe-MI 1.0b specification.
What PCIe Gen4 features does the PM41068B-FEI implement for signal integrity validation?
The PM41068B-FEI implements real-time eye capture, external loopback modes, and per-port performance counters to validate Gen4 signal integrity during system bring-up and field maintenance. These features operate without external test equipment and are accessible via ChipLink diagnostic tools. Real-time eye capture is enabled per-lane on the PM41068B-FEI and supports both passive and optical PHY configurations.
Is the PM41068B-FEI pin-compatible with other PSX Gen4 devices like PM41084B-FEI or PM41052B-F3EI?
No, the PM41068B-FEI is not pin-compatible with PM41084B-FEI or PM41052B-F3EI. Each PSX Gen4 variant uses a unique FC-BGA package: PM41068B-FEI is 780-pin F3EI, PM41084B-FEI is 936-pin FEI, and PM41052B-F3EI is 676-pin F3EI. While they share architectural compatibility and SDK parity, PCB layout must be redesigned for each part due to differing pin counts, ball maps, and power delivery requirements.
PM41068B-FEI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Switchtec
- Package/Case:
- 1467-BBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Applications:
- Controller
- Interface:
- JTAG, MII, RMII, UART, 2-Wire SMBus
- Voltage - Supply:
- -
- Supplier Device Package:
- 1467-BBGA (40x40)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
PM41068B-FEI FAQ
1.How can I place an order for PM41068B-FEI through Aetrix?
Please submit a Request for Quotation (RFQ) for PM41068B-FEI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for PM41068B-FEI reliable?
The price and inventory of PM41068B-FEI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PM41068B-FEI is usually 5 days.
3.What payment methods are accepted for PM41068B-FEI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PM41068B-FEI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PM41068B-FEI?
PM41068B-FEI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PM41068B-FEI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for PM41068B-FEI?
For technical support, including PM41068B-FEI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PM41068B-FEI requirements.
6.How does Aetrix verify that PM41068B-FEI is sourced from the original manufacturer or authorized distributors?
All PM41068B-FEI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that PM41068B-FEI meets industry standards.
7.What is the process for return or replacement of PM41068B-FEI?
All PM41068B-FEI units undergo pre-shipment inspection (PSI). If there is an issue with PM41068B-FEI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The PM41068B-FEI part is unused and in its original packaging.
Return procedure for PM41068B-FEI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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