Renesas 89H12NT12G2ZAHL

Overview

89H12NT12G2ZAHL from IDT is an evaluation board (EVB) designed to validate the 89HPES12NT12G2 - a PCIe 2.1-compliant, 12-lane, 12-port inter-domain switch supporting Gen2 5 GT/s SerDes, up to 2048-byte payload, and automatic lane reversal/polarity inversion. It enables hardware/software validation of switch partitioning, NTB, DMA, and local port clocking in server and storage systems.

For engineers reviewing the 89H12NT12G2ZAHL datasheet, 89H12NT12G2ZAHL pinout, 89H12NT12G2ZAHL application, or 89H12NT12G2ZAHL equivalent, this page delivers verified board-level specifications, power sequencing, clock configuration options, SMBus/JTAG interfaces, and PCIe mezzanine adapter compatibility - all critical for PCIe switch integration and system-level debug.

Technical Context

The 89H12NT12G2ZAHL implements full hardware access to the 89HPES12NT12G2 switch via dual Mezzanine connectors and SAS/SATA breakout paths, supporting x1/x2/x4/x8 link configurations across 12 downstream ports. It integrates configurable reference clock routing (SMA, onboard ICS841484 generator, SATA), dual SMBus interfaces (master/slave), and JTAG for boundary-scan and register-level debug.

Power delivery uses discrete regulators for VDDCORE (1.0 V), VDDPEA (1.0 V), VDDPETA (1.0 V), VDDPEHA (2.5 V), and VDDIO (3.3 V), with strict ramp-up sequencing requiring VDDCORE remain ≥1.0 V below VDDIO. Reset includes fundamental PERST# propagation and warm reset push-button support.

Key Specifications

Availability

89H12NT12G2ZAHL is available at Aetrix Electronics and suitable for PCIe switch validation, server/storage interconnect prototyping, multi-root NTB testing, and PCIe Gen2 signal integrity analysis requiring stable component supply and traceable sourcing.

Supply support for 89H12NT12G2ZAHL 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

Integrated Device Technology, Inc. (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and PCIe connectivity solutions before its acquisition by Renesas in 2019.

The 89H12NT12G2ZAHL belongs to IDT's PCIe Switch Evaluation Platform family, engineered specifically to accelerate validation of high-port-count, multi-partition PCIe switches in datacenter and enterprise storage applications.

FAQ

What is the primary function of the 89H12NT12G2ZAHL evaluation board?

The 89H12NT12G2ZAHL evaluation board is a hardware platform designed exclusively to evaluate the 89HPES12NT12G2 PCIe 2.1 switch. It provides full electrical access to all 12 lanes and ports, supports configurable clocking (global/local), enables NTB and DMA feature testing, and integrates JTAG, SMBus, and PCIe mezzanine interfaces for comprehensive system-level validation in server and storage environments. The 89H12NT12G2ZAHL itself contains no active switching logic - it is a passive carrier and interface platform.

Does the 89H12NT12G2ZAHL support PCIe Gen3 or higher speeds?

No. The 89H12NT12G2ZAHL is designed for the 89HPES12NT12G2 switch, which complies strictly with PCIe Base Specification Revision 2.1 and operates at Gen2 speeds (5 GT/s). It does not support Gen3 (8 GT/s) or higher signaling rates. Clocking, layout, and SerDes termination on the 89H12NT12G2ZAHL are optimized for 5 GT/s operation only, and no firmware or hardware modification enables Gen3 functionality.

Can the 89H12NT12G2ZAHL be used without an external power supply?

No. The 89H12NT12G2ZAHL requires an external 12 V input via the 24-pin EPS12V connector (J69); it does not draw operating power from the host PCIe slot. This ensures stable, isolated regulation for all five voltage domains (VDDCORE, VDDPEA, VDDPETA, VDDPEHA, VDDIO) and eliminates slot-power limitations during multi-port stress testing. The 89H12NT12G2ZAHL has no onboard battery or alternative power source.

How is clock configuration managed on the 89H12NT12G2ZAHL?

Clock configuration on the 89H12NT12G2ZAHL is controlled via hardware jumpers (J18/J19), DIP switches (SW10, S10, S17, S19), and onboard clock buffers (U50/U51). Global reference clocks (100/125 MHz) can be sourced from SMA connectors, the ICS841484 generator (U49), or SATA headers. Local port clocks (100 MHz only) are selected per port (e.g., Port 8/16) using dedicated DIP switches. All settings are physically wired - no software-based clock reconfiguration is supported on the 89H12NT12G2ZAHL itself.

Is the 89H12NT12G2ZAHL compatible with the 89HPES24NT24G2 switch?

No. The 89H12NT12G2ZAHL is specifically designed for the 12-port 89HPES12NT12G2 switch and is not mechanically or electrically compatible with the 24-port 89HPES24NT24G2. While both belong to IDT's LOGAN family and share architectural concepts, the 89H12NT12G2ZAHL's PCB layout, Mezzanine pinout, power delivery, and clock routing are scaled for 12 lanes - not 24. The EB-LOGAN-19 board referenced in documentation corresponds to the 24-port variant and is a distinct SKU.