Renesas 89H24NT24G2ZAHLG8

Overview

89H24NT24G2ZAHLG8 from IDT is an evaluation board (EB-LOGAN-19) designed for the 89HPES24NT24G2 PCIe Gen2 24-lane, 24-port inter-domain switch. It provides full access to all 24 lanes via Mezzanine and SAS connectors, supports configurable upstream/downstream port partitioning, NTB mode, DMA, and local port clocking, and enables validation of PCIe link width negotiation (x1/x2/x4/x8), lane reversal, polarity inversion, and 2048-byte payload in server and storage interconnect applications.

For engineers reviewing the 89H24NT24G2ZAHLG8 datasheet, 89H24NT24G2ZAHLG8 pinout, 89H24NT24G2ZAHLG8 application, or 89H24NT24G2ZAHLG8 equivalent, this page delivers verified hardware configuration options, reference clock sourcing paths (SMA, SATA, onboard ICS841484), power sequencing constraints (VDDCORE ≤ VDDIO − 1.0V), SMBus slave/master interfaces, JTAG debug access, and PCIe slot breakout capabilities using IDT-provided mezzanine and edge adapters.

Technical Context

The 89H24NT24G2ZAHLG8 implements a complete PCIe Base Specification 2.1 (Gen2, 5 GT/s) evaluation platform centered on the PES24NT24G2 switch. It integrates dual differential global reference clock inputs (100/125 MHz), per-port local clocking support for ports 8 and 16, and flexible CLKMODE[1:0] boot configuration to set Common Clock or Non-Common Clock operation across all 24 ports.

Power delivery includes five dedicated regulators: U59 (1.0V VDDCORE), U62 (1.0V VDDPEA), U65 (2.5V VDDPEHA), U68 (1.0V VDDPETA), and U56 (3.3V VDDIO), with strict ramp-up sequencing requiring VDDCORE to stay at least 1.0V below VDDIO. Reset is implemented via fundamental PERST# propagation and downstream hot-reset signaling.

Key Specifications

Availability

89H24NT24G2ZAHLG8 is available at Aetrix Electronics and suitable for PCIe switch validation, multi-root I/O virtualization (MR-IOV), NTB-based peer-to-peer communication, high-density storage interconnect, and server backplane design requiring stable component supply and full hardware configurability.

Supply support for 89H24NT24G2ZAHLG8 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) is a fabless semiconductor company specializing in timing, interface, memory interface, and RF solutions for communications, computing, and industrial markets.

The 89H24NT24G2ZAHLG8 belongs to IDT's PCIe Inter-Domain Switch evaluation platform family, engineered specifically to accelerate development and system-level validation of high-port-count, Gen2-compliant PCIe switching architectures in data center and enterprise storage systems.

FAQ

What is the primary function of the 89H24NT24G2ZAHLG8 evaluation board?

The 89H24NT24G2ZAHLG8 is the EB-LOGAN-19 evaluation board for the 89HPES24NT24G2 PCIe Gen2 switch. Its primary function is to provide a fully configurable hardware platform for validating switch features including port partitioning, NTB mode, DMA, local port clocking, link width negotiation (x1–x8), and PCIe 2.1 compliance testing in server and storage interconnect designs. It is not a standalone IC or production component.

Does the 89H24NT24G2ZAHLG8 include the 89HPES24NT24G2 switch IC mounted on-board?

Yes, the 89H24NT24G2ZAHLG8 evaluation board has the 89HPES24NT24G2 PCIe switch IC physically populated on the main board (DUT on bottom side, per Figure 2.5). The board brings out all 24 lanes to Mezzanine and SAS connectors and provides full power, clock, reset, SMBus, and JTAG access required for comprehensive device evaluation.

What clock sources does the 89H24NT24G2ZAHLG8 support for the PES24NT24G2 switch?

The 89H24NT24G2ZAHLG8 supports three clock source categories: (1) Global reference clocks (100/125 MHz) from SMA connectors (J17/J20/J66/J67), SATA connectors (J21/J22/J8), or onboard ICS841484 clock generator (U49); (2) Local port clocks for ports 8 and 16 sourced from dedicated clock muxes (U118/U120) or SATA; and (3) Slot-specific clocks selected via DIP switches (S17/S19) and jumpers (J31–J34).

How is power delivered and sequenced on the 89H24NT24G2ZAHLG8 board?

Power is delivered via a 24-pin Molex EPS12V connector (J69) supplying +12V, +5V, +3.3V, and PS_ON. Five dedicated voltage regulators generate VDDCORE (1.0V), VDDPEA (1.0V), VDDPEHA (2.5V), VDDPETA (1.0V), and VDDIO (3.3V). Critical sequencing requires VDDCORE to remain at least 1.0V below VDDIO during ramp-up - no other sequencing constraints apply.

Can the 89H24NT24G2ZAHLG8 be used for NTB (Non-Transparent Bridge) application testing?

Yes, the 89H24NT24G2ZAHLG8 explicitly supports NTB mode evaluation. The underlying 89HPES24NT24G2 switch allows up to eight ports to be configured as NTB ports for multi-root I/O virtualization, and the board provides full SMBus and JTAG access needed to configure and verify NTB register settings, address translation, and peer-to-peer memory-mapped transactions.