PM8254B-F3EI

Overview

The Microchip Technology PM8254B-F3EI is a SmartROC 3200 family PCIe Gen 4 SAS-4 tri-mode storage controller designed for enterprise server storage. It features an integrated PCIe Gen 4 switch supporting x1 to x8 bifurcation and up to 32 storage lanes. The device provides an x8 host interface and supports 72-bit DDR4 memory without encryption capabilities. It enables RAID-on-chip functionality for NVMe, SAS-4, and SATA media, incorporating Dynamic Channel Multiplexing (DCM) for bandwidth aggregation. The component utilizes a 900-pin FCBGA package with dimensions of 25 mm × 25 mm and a 0.8 mm pitch.

Feature Summary

• Tri-mode support enabling automatic detection and link speed negotiation for PCIe, SAS, and SATA interfaces.
• Integrated Switchtec PCIe Gen 4 switch architecture providing low latency and high performance for NVMe targets.
• Dynamic Channel Multiplexing (DCM) technology for efficient bandwidth aggregation across varying drive speeds.
• Hardware root-of-trust implementation ensuring firmware integrity through Secure Boot and Secure Update mechanisms.

Applications

• Enterprise rack servers requiring universal bay architectures with mixed drive types.
• Cloud data centers needing high-performance NVMe RAID solutions with optional encryption.
• Dense 2U server configurations utilizing SFF-TA-1001 tri-mode backplanes.
• JBOD expansion systems connecting lower-speed targets via DCM-enabled SAS-4 links.

Procurement Notes

Verify the specific part number PM8254B-F3EI against official Microchip documentation to confirm it represents the non-encryption variant with 72-bit DDR4 support. Ensure compatibility with required host interfaces and memory configurations before procurement. Cross-reference ordering information to distinguish between standard and encrypted models within the SmartROC 3200 family.

Selection Notes

Select this model when an x8 host interface suffices and hardware encryption is not required. Compare against the PM8255B-F3EI if data-at-rest encryption is necessary. Consider larger packages like the PM8264B-F3EI or PM8276B-F3EI if higher lane counts or x16 host connectivity are needed for increased throughput requirements.

Part Context

This component belongs to the SmartROC 3200 family, representing Microchip's fifth-generation storage controllers. It integrates advanced caching, RAID capabilities, and security features tailored for next-generation enterprise and cloud data center environments. The family emphasizes versatility through tri-mode support and flexible lane configurations.

Replacement Considerations

The PM8255B-F3EI serves as a direct functional substitute if encryption support is required, sharing identical physical and interface specifications. Other family members offer different lane counts or host widths but maintain similar architectural foundations.

FAQ

Does the PM8254B-F3EI support hardware-based encryption?

No, the PM8254B-F3EI does not include encryption capabilities. Models designated with an 'e' suffix, such as the PM8255B-F3EI, provide controller-based encryption support.

What memory configuration does this controller use?

The PM8254B-F3EI utilizes 72-bit DDR4 memory. Higher-end variants in the family may support 144-bit DDR4 configurations.

How does Dynamic Channel Multiplexing benefit storage performance?

DCM aggregates bandwidth for lower-speed drives over SAS-4 links, achieving near 100% link efficiency when connected to compatible SAS-4 expanders.