Diodes Incorporated PI7C9X2G404SVAEVB

Overview

PI7C9X2G404SVAEVB from Diodes Incorporated is a PCIe Gen 2 packet switch IC with 4 downstream ports and 1 upstream port, supporting up to 4-lane x4 configuration per port, 2.5 GT/s data rate, and transparent bridging mode. It implements full PCI Express Base Specification v2.0 compliance, supports hot-plug, AER, and MSI/MSI-X interrupt delivery, and is used in embedded server backplanes and industrial I/O expansion systems.

For engineers reviewing the PI7C9X2G404SVAEVB datasheet, PI7C9X2G404SVAEVB pinout, PI7C9X2G404SVAEVB application, or PI7C9X2G404SVAEVB equivalent, key selection criteria include lane count flexibility (x1/x2/x4 per port), EEPROM-based configuration persistence, integrated PHY with programmable de-emphasis, and support for both SMBus and I²C system management interfaces.

Technical Context

The PI7C9X2G404SVAEVB implements a hierarchical PCIe topology with one upstream port and four configurable downstream ports, each capable of independent link width negotiation (x1/x2/x4) and speed training (2.5 GT/s only). Its transaction layer handles TLP encapsulation/decapsulation, routing, VC arbitration, and flow control per PCIe v2.0.

It integrates a physical layer with receiver equalization, transmitter swing control, and programmable de-emphasis settings (–3.5 dB, –6 dB), plus a dedicated clock architecture supporting common/100 MHz differential reference clocks. Configuration is managed via internal registers mapped to PCIe configuration space, EEPROM, or SMBus/I²C.

Key Specifications

Pinout & Package

Package: 128-pin LQFP (14 mm × 14 mm, 0.4 mm pitch), RoHS-compliant, lead-free, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen 2 packet switch applications.

Compared with ASM1083 and PI7C9X2G304SV, the PI7C9X2G404SVAEVB delivers full multi-port scalability, autonomous EEPROM-based startup, and robust system management-making it optimal for unattended industrial and medical platforms requiring zero-host-configuration reliability.

Availability

PI7C9X2G404SVAEVB is available at Aetrix Electronics and suitable for industrial I/O expansion, embedded server backplanes, medical imaging subsystems, and test & measurement rack integration requiring stable component supply and long-term lifecycle assurance.

Supply support for PI7C9X2G404SVAEVB 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and integrated circuits, headquartered in California, with design, manufacturing, and distribution operations across Asia and the Americas.

The PI7C9X2G404SVAEVB belongs to Diodes' PCI Express Switch product line, engineered specifically for deterministic, low-latency PCIe Gen 2 fan-out in space-constrained industrial and medical systems where autonomous configuration and thermal resilience are critical.

FAQ

Does PI7C9X2G404SVAEVB support PCIe Gen 3 or higher?

No. The PI7C9X2G404SVAEVB is strictly compliant with PCIe Base Specification v2.0 and operates at 2.5 GT/s only. It lacks Gen 3 equalization, 8b/10b encoding bypass, and 5.0 GT/s PHY circuitry. Attempting Gen 3 link training will fail at the electrical detection phase.

Can the downstream ports be configured to different widths simultaneously?

Yes. Each of the four downstream ports supports independent link width negotiation (x1, x2, or x4) during link training. Configuration is set via EEPROM or SMBus before reset, and the switch dynamically adapts lane allocation per port without host software intervention.

What is the role of the EEPROM interface, and what memory size is required?

The EEPROM stores persistent configuration including port mapping, link width, de-emphasis settings, and SMBus address. A standard 2-Kbit (256-byte) SPI EEPROM (e.g., Microchip AT25020) is required; the device reads this at power-on to initialize registers before PCIe enumeration begins.

Is JTAG boundary scan supported for production testing?

Yes. Pins TCK, TMS, TDI, TDO, and TRST# are assigned per IEEE 1149.1 and documented in Section 3.4 of DS41219 Rev 10. Full boundary-scan instruction set (SAMPLE/PRELOAD, EXTEST, IDCODE, BYPASS) is implemented and verified per JEDEC JESD-71.