company blog about Recycle Microchip Switchtec PSX Programmable PCIe Switches:PSX Gen 5,PSX Gen 4,PSX Gen 3

Recycle Microchip Switchtec PSX Programmable PCIe Switches:PSX Gen 5,PSX Gen 4,PSX Gen 3

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The Microchip Switchtec PSX series comprises programmable PCIe switches designed for high-performance, high-reliability applications, covering Gen 5, Gen 4, Gen 3 standards. With core advantages including a non-blocking switching architecture, integrated processor, SDK programmability, multi-port high density, and enterprise-grade reliability, it is specifically designed for high-end applications such as data centres, AI computing, enterprise storage, multi-host systems, and industrial and automotive sectors, enabling users to achieve differentiated functionality through firmware customisation.

I. Core Positioning and Common Advantages of the Switchtec PSX Series

The PSX series is positioned as a flagship programmable PCIe switch, distinct from the basic fan-out PFX series. Its core common benefits are as follows:

Fully programmable architecture: Integrates a MIPS processor, paired with a dedicated SDK, supporting customised error handling, PCIe enumeration, chassis management, performance monitoring and other functions.

High-Density Non-Blocking Switching: A single chip supports up to hundreds of lanes and dozens of ports, with flexible x1/x2/x4/x8/x16 port splitting and non-blocking full-line-rate forwarding.

Enterprise-grade high reliability: All ports support AER (Advanced Error Reporting), DPC downstream port containment, CTS completion timeout synthesis, and hot-swap/unintended disconnection control, with support for 1+1/N+1 failover.

Multi-topology expansion: Integrated NTB (Non-Transparent Bridge) supporting multi-host isolation, cross-domain interconnection and large-scale topology construction, suitable for storage pooling and compute partitioning scenarios.

Comprehensive management interfaces: Built-in I2C/SMBus, GPIO, UART, Ethernet MAC, JTAG and more, supporting in-band/out-of-band management and NVMe-MI chassis management.

II. PSX Gen 5: PCIe 5.0 Flagship, 32GT/s High-Performance Benchmark

PSX Gen 5 is the latest generation in the series, compatible with the PCIe 5.0 specification (32GT/s), designed for scenarios requiring extreme bandwidth such as large AI models, supercomputing, fourth-generation storage, and high-speed GPU clusters.

1. Key Specifications

Lanes / Ports: 28/36/52/68/84/100 lanes, corresponding to 16/20/28/36/44/52 ports.

Virtual Ports / NTB: Up to 26 virtual switch ports and 48 NTBs, assignable to any port.

Bandwidth Performance: 32GT/s per lane; the 100-lane model delivers a total switching capacity exceeding 640GB/s, with full line-rate, non-blocking performance.

Process Technology and Power Consumption: Advanced process technology, low-power SERDES, supporting PCIe 5.0 equalisation and signal integrity optimisation.

Model Examples: PM51100B1-FEI (100xG5), PM51084B1-FEI (84xG5), PM51036B1-FEI (36xG5).

2. Key Enhanced Features

Ultra-low latency DMA: 64-channel ultra-low latency pass-through DMA engine, supporting direct data transfer between devices to reduce CPU load.

PCIe 5.0 Dedicated Optimisations: Supports FLIT mode, lightweight FEC and dynamic link balancing, optimised for long-distance and high-speed signal transmission.

Security Enhancements: Boot image authentication and secure firmware updates, meeting data centre security compliance requirements.

Diagnostic Enhancements: Real-time eye diagram capture, external loopback, TLP analysis and port mirroring, simplifying high-speed link debugging.

3. Typical Applications

AI training servers, GPU clusters, supercomputing centres

NVMe-oF storage systems, JBOF high-density flash storage enclosures

Multi-host high-availability systems, compute/storage/network pooling architectures

Autonomous driving domain controllers, in-vehicle high-speed interconnects (automotive-grade versions)

III. PSX Gen 4: Mainstream PCIe 4.0, a mature and reliable 16GT/s workhorse

PSX Gen 4 is compatible with the PCIe 4.0 specification (16GT/s) and is currently the mainstream solution for data centres and enterprise-grade storage. It strikes a balance between performance, cost and compatibility, with a mature ecosystem and widespread deployment.

1. Core Specifications

Lanes / Ports: 36/68/100 lanes, corresponding to 20/34/52 ports.

Virtual Partitions / NTBs: Up to 26 virtual partitions and 48 NTBs, with no restrictions on port configuration.

Bandwidth Performance: 16GT/s per channel; the 100-channel model offers a total switching capacity of 320GB/s with full-line-rate forwarding.

Management Integration: Built-in NVMe controller, supporting NVMe-MI in-band management, SES chassis management, and MCTP out-of-band management.

Model Examples: PM41036 (36xG4), PM41068 (68xG4), PM41100 (100xG4).

2. Key Features

Mature, programmable SDK: Supports customised error isolation, hot-swap logic, performance counter monitoring, and chassis management firmware development.

Flexible topologies: Supports multi-host, multi-zone, and NTB cross-domain interconnects, suitable for blade servers and high-density storage enclosures.

Low-power design: Optimised SERDES and architecture, with lower power consumption than competitors at equivalent density, suitable for high-density rack deployments.

Comprehensive error containment: Upstream Error Containment (UEC), toxic TLP blocking, and end-to-end data integrity protection.

3. Typical Applications

Enterprise-class servers, blade servers

Mid-to-high-end NVMe SSD enclosures, flash arrays

Hybrid cloud infrastructure, multi-tenant virtual partitioning systems

Industrial control, communications equipment, high-speed interconnects for medical imaging

IV. PSX Gen 3: PCIe 3.0 Classic, a cost-effective 8GT/s cornerstone

PSX Gen 3 is compatible with the PCIe 3.0 specification (8GT/s) and represents a classic, mature model in the series. Offering high reliability, low cost and a long lifecycle, it is suitable for scenarios requiring high stability, such as traditional data centres, industrial control and embedded systems.

1. Key Specifications

Lanes / Ports: 24/32/48/64/80/96 lanes, corresponding to 12/16/24/32/40/48 ports.

Virtual Partitions / NTBs: Up to 24 virtual partitions and 48 NTBs, with support for port multicasting.

Bandwidth Performance: 8 GT/s per channel; 174 GB/s total switching capacity for the 96-channel model; non-blocking architecture.

Integrated Peripherals: 10/100 Ethernet MAC, up to 106 GPIOs, 4 UARTs, 8 I2C/SMBus channels.

Model examples: PM8542 (32xG3), PM8543 (48xG3), PM8545 (80xG3).

2. Key Features

The first programmable PCIe switch with an integrated processor: establishes the foundation for the series’ programmability, with an SDK supporting firmware customisation.

Industrial-grade reliability: ECC memory protection, wide temperature support and long-life availability, suitable for demanding industrial and embedded environments.

Comprehensive debugging tools: Built-in PCIe analyser, TLP generator, flexible triggering and eye diagram analysis to reduce development complexity.

Multi-connector compatibility: Supports SFF-8644/8643/8639, OCuLink and others, compatible with various PCIe cables and slots.

3. Typical Applications

Traditional data centre servers, storage expansion enclosures

Industrial automation, defence communications, medical equipment

Embedded computing platforms, network equipment, video processing systems

Legacy system upgrades, scenarios requiring high stability and low bandwidth