Renesas 89H24NT24G2ZAHLI8

Overview

89H24NT24G2ZAHLI8 from IDT is an evaluation board (EB-LOGAN-19) designed for the 89HPES24NT24G2 PCIe Gen2 24-lane, 24-port inter-domain switch. It supports x1/x2/x4/x8 lane configurations, NTB multi-root operation, and local port clocking. The board enables full hardware validation of PCIe switching in server and storage systems with configurable upstream/downstream topology.

For engineers reviewing the 89H24NT24G2ZAHLI8 datasheet, 89H24NT24G2ZAHLI8 pinout, 89H24NT24G2ZAHLI8 application, or 89H24NT24G2ZAHLI8 equivalent, this page provides verified board-level specifications, clocking configuration options, power sequencing requirements, reset behavior, and adapter compatibility for PCIe mezzanine, SAS, and edge-to-SATA interconnect testing.

Technical Context

The 89H24NT24G2ZAHLI8 evaluation platform implements the IDT PES24NT24G2 switch in a fully routed, test-ready configuration with dual global reference clocks (100/125 MHz), per-port clock muxing for ports 8 and 16, and support for common clock, non-common clock, and local port clocking modes via CLKMODE[1:0] boot vector settings.

It integrates five dedicated voltage 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 VDDCORE–VDDIO ramping constraint (Δ ≤ 1.0 V). Power is supplied via a 24-pin EPS12V connector (J69), and thermal management uses an active heatsink with integrated fan.

Key Specifications

Availability

89H24NT24G2ZAHLI8 is available at Aetrix Electronics and suitable for PCIe switch validation, server backplane prototyping, storage subsystem development, and NTB-based multi-root system integration requiring stable component supply and long-term evaluation board availability.

Supply support for 89H24NT24G2ZAHLI8 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 Electronics in 2019.

The 89H24NT24G2ZAHLI8 belongs to IDT's PCIe Inter-Domain Switch evaluation platform family, engineered specifically to accelerate validation of high-lane-count PCIe Gen2 switches in enterprise servers, JBODs, and multi-root storage architectures.

FAQ

What is the primary function of the 89H24NT24G2ZAHLI8 evaluation board?

The 89H24NT24G2ZAHLI8 is the EB-LOGAN-19 evaluation board for the IDT 89HPES24NT24G2 PCIe Gen2 switch. Its purpose is to provide a complete, configurable hardware platform for validating switch functionality-including lane bifurcation, NTB operation, local port clocking, and multi-partition boot-without requiring custom PCB design. It supports direct connection to host root complexes and endpoint cards via mezzanine, SAS, and edge adapters.

Does the 89H24NT24G2ZAHLI8 include the 89HPES24NT24G2 switch IC mounted on-board?

Yes, the 89H24NT24G2ZAHLI8 evaluation board has the 89HPES24NT24G2 PCIe switch IC physically populated on the main board (DUT on bottom side, as shown in Figure 2.5). All 24 lanes are broken out to mezzanine and SAS connectors, and all critical power, clock, reset, and configuration interfaces are implemented per IDT's reference design.

What clock sources does the 89H24NT24G2ZAHLI8 support for the PES24NT24G2 device?

The 89H24NT24G2ZAHLI8 supports three clock source options: (1) external differential clocks via SMA connectors (J17/J20, J66/J67), (2) onboard ICS841484 generator (U49) outputting fixed 100 MHz, and (3) SATA connectors (J21/J22, J8, J35–J38). Dual global clocks are mandatory and must originate from the same source; local port clocks for ports 8 and 16 are selectable via DIP switches S19 and S17.

How is power delivered and sequenced on the 89H24NT24G2ZAHLI8 board?

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

Can the 89H24NT24G2ZAHLI8 be used for NTB (Non-Transparent Bridge) applications?

Yes, the 89H24NT24G2ZAHLI8 fully supports NTB operation. The underlying 89HPES24NT24G2 switch allows up to eight ports to be configured as NTB ports, enabling multi-root PCIe topologies. The evaluation board's firmware and configuration tools (including SMBus EEPROM programming) support NTB partition setup, BAR remapping, and peer-to-peer DMA - all validated using IDT's provided software suite.