Diodes Incorporated PI7C9X130DNDE

Overview

PI7C9X130DNDE from Diodes Incorporated is a PCI Express 1.0a to PCI-X 266 MHz reversible bridge IC enabling bidirectional protocol translation between PCIe 1.0a (2.5 GT/s) and 64-bit/133 MHz or 64-bit/266 MHz PCI-X buses. It supports transparent and non-transparent bridging modes, operates with 1.8 V core and 3.3 V I/O supply rails, and implements full PCIe endpoint configuration space mapping for legacy system integration in server backplanes and industrial control chassis.

For engineers reviewing the PI7C9X130DNDE datasheet, PI7C9X130DNDE pinout, PI7C9X130DNDE application, or PI7C9X130DNDE equivalent, key selection considerations include PCIe-to-PCI-X timing compliance, hot-swap support via HSSW/HSEN pins, dual-mode strapping (MODE[1:0]), JTAG boundary scan capability, and register-level control of upstream memory write fragmentation and replay latency timers.

Technical Context

The PI7C9X130DNDE implements a deterministic, register-configurable bridge architecture with separate PCIe TLP parser/transmitter and PCI-X command decoder/arbiter logic. It handles address translation across 32-bit and 64-bit address spaces, supports Type 0/Type 1 configuration transactions, and includes dedicated buffers for posted writes and split completions.

Its clocking scheme accommodates asynchronous operation: PCIe reference clock (100 MHz differential) and PCI-X clock (133/266 MHz single-ended) are independently sourced. The device supports virtual isochronous operation for latency-sensitive transfers and provides programmable ACK/Replay timer values (offset 310h, bit[30]) to tune retry behavior under bus stress.

Key Specifications

Pinout & Package

PI7C9X130DNDE is housed in a 324-pin plastic ball grid array (PBGA) package with 27 mm × 27 mm footprint and 1.0 mm ball pitch. Thermal pad on underside requires solder paste stencil opening and thermal via pattern per Diodes' layout guidelines (DS40252 Section 17).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCI Express to PCI-X bridging applications.

Compared with PEX8112 and PI7C9X20404, the PI7C9X130DNDE uniquely balances PCI-X 266 MHz support, reversible operation, and industrial temperature range in a compact 324-pin package-making it optimal for cost-sensitive, space-constrained backplane upgrades where PCI-X bandwidth is mandatory.

Availability

PI7C9X130DNDE is available at Aetrix Electronics and suitable for server backplane interconnect, industrial control chassis, and test equipment rack applications requiring stable component supply and long-term lifecycle support.

Supply support for PI7C9X130DNDE 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, specializing in high-performance analog, logic, and interconnect solutions for industrial, computing, and communications markets.

The PI7C9X130DNDE belongs to Diodes' PCI Express bridge product line, designed specifically to extend the service life of legacy PCI-X infrastructure within modern PCIe-based systems while meeting industrial reliability and thermal requirements.

FAQ

Is PI7C9X130DNDE pin-compatible with earlier revisions like PI7C9X130B?

No. PI7C9X130DNDE uses a 324-pin PBGA package with updated pin assignments for PCIe differential pairs and enhanced hot-swap signaling. Earlier versions used different ballouts and lack HSSW/HSEN pins. Migration requires PCB layout revision and register initialization updates per DS40252 Rev 9 Section 2.8.

Does PI7C9X130DNDE support PCIe 2.0 or higher?

No. The device complies strictly with PCI Express Base Specification 1.0a (2.5 GT/s). It does not support 5.0 GT/s signaling, ASPM L1 substates, or enhanced configuration mechanisms introduced in PCIe 2.0. Its maximum link speed is fixed at 2.5 GT/s with Gen1 encoding.

Can PI7C9X130DNDE operate in reverse mode (PCI-X → PCIe) without firmware changes?

Yes. Reverse bridging is enabled by strapping MODE[1:0] = 10b at power-up and configuring the BRIDGE CONTROL REGISTER (offset 3Ch, bit 12) to set reverse direction. No host firmware modification is required beyond initial configuration register writes during enumeration.

What is the function of the RREF pin on PI7C9X130DNDE?

RREF is a precision 1.2 V reference output used to calibrate internal termination resistors for PCIe differential receivers. It must be connected to a 0.1 µF decoupling capacitor to ground and left unconnected to any external circuitry. Deviation from 1.2 V ±1% invalidates PCIe RX impedance matching per DS40252 Section 16.2.