Diodes Incorporated
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PCIe 2.0 4-Port/4-Lane ExtremeLo Packet Switch

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The PI7C9X2G404SV is a PCI Express® 2.0 4-port/4-lane PCI Express ExtremeLo Packet Switch specifically designed to meet the latest low-power, lead (Pb)-free and green system requirements. The PI7C9X2G404SV is a high-performance, cost-effective solution that can be implemented in systems such as Embedded system, AI, IoT, IPC, Wi-Fi router, Printer, NAS, HBA, STB, PC and other power-sensitive high performance platforms.

The PI7C9X2G404SV provides one upstream port and three x1 downstream ports. The PI7C9X2G404SV provides users the flexibility to expand or fan-out from a wide range of x86, ARM and MIPS based embedded SoC/ chipset, FPGA, and other Application Specific ICs.


  • Integrated 100MHz Clock buffer for each downstream port
  • Support Surprise Hot-Plug (DPC)
  • Peer-to-peer Switching between any two downstream ports
  • Reliability, Availability and Serviceability
    • Supports Data Poisoning and End-to-End CRC
    • Advanced Error Reporting and Logging
    • IEEE 1149.1 JTAG interface support
  • 150ns typical latency for packet running through switch without blocking
  • Supports up to 512-byte maximum payload size
  • Advanced Power Savings: Empty downstream ports are set to idle
  • Link Power Management
    • Supports L0, L0s, L1, L2, L2/L3Ready and L3 link power state
    • Supports PCI-PM L1.1 and ASPM L1.1 of L1 PM Sub-state
    • Active state power management for L0s and L1 state
  • Device State Power Management
    • Supports D0, D3Hot and D3Cold device power states
    • 3.3V Aux Power support in D3Cold power state
  • Strapped pins configurable with optional EEPROM or SMBus
  • Extended Virtual Channel capability
    • 2 Virtual Channels (VC) and 8 Traffics (TC)
    • Provides VC arbitration selection
    • Independent TC/ VC mapping for each port
    • Port Arbitration: Round Robin (RR), Weighted RR, Timebased Weighted RR
  • Programmable Driver Current and De-Emphasis Level at each individual port
  • Supports “Cut-through”(Default) as well as “Store and Forward” mode for switching packets
  • Supports Access Control Service (ACS) for peer-to-peer traffic
  • Supports Address Translation (AT) packet for SR-IOV application
  • Supports LTR, OBFF
  • Power Dissipation: 0.3W typical in L0 normal mode and 0.035W typical in L1.1 D3Hot mode
  • Industrial Temperature Range: -40oC to 85oC
  • MTBF: 50,927,360 hours


  • Wireless AP/ Router/ Gateway
  • Networking/ Telecom
  • Embedded system/ IPC/ Industrial control
  • Set-top box and consumer devices
  • NAS/ Storage
  • Peripheral/ Printer/ MFP
  • Surveillance/ Security and Combo cards
  • IoT/ AI
  • PC/ NB PCIe slot expansion

Product Specifications

Product Parameters

Ports 4
Lanes 4
Power 0.3 w
Latency 150 ns
Ambient or Junction Temperature (°C) -40 to 85
Compliance (Only Automotive supports PPAP) Standard

Technical Documents

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Application information, Design tool model software, Design kits, Evaluation board, and Other technical documents

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