Renesas 89H32NT24AG2ZAHL8

Overview

89H32NT24AG2ZAHL8 from IDT is a 32-lane, 24-port PCI Express Gen2 system interconnect switch with non-transparent bridging (NTB), switch partitioning, and integrated DMA controllers. It delivers up to 32 GBps switching capacity, supports 5.0 GT/s link speed per lane, and operates in servers, storage systems, and intelligent I/O subsystems requiring multi-domain PCIe communication.

For engineers reviewing the 89H32NT24AG2ZAHL8 datasheet, 89H32NT24AG2ZAHL8 pinout, 89H32NT24AG2ZAHL8 application, or 89H32NT24AG2ZAHL8 equivalent, key selection criteria include NTB endpoint count (up to 8), partitioning flexibility (up to 8 independent switches), SerDes configurability per lane, hot-plug support across all 23 downstream ports, and compliance with PCI Express Base Specification 2.1.

Technical Context

The 89H32NT24AG2ZAHL8 implements a Combined Input Output Queued (CIOQ) switch core with large buffers and low-latency cut-through architecture. It integrates eight independent NTB endpoints, each with six BARs supporting 32/64-bit address translation and look-up table–based mapping for inter-domain memory access.

Its port configuration supports four x8 stacks-each configurable as x8, x4, x2, or x1-with automatic lane-width negotiation and reversal. Clocking supports 100 MHz or 125 MHz reference inputs in common, non-common, or local port clock modes with SSC capability.

Key Specifications

Pinout & Package

484-ball Flip Chip BGA (23 mm × 23 mm, 1 mm ball pitch) with thermal pad. Pin functions include 24 differential PCIe transmit/receive pairs (PE[0–23]TP/RP/TN/RN), global and per-port reference clocks (GCLKP/N, PxxCLKP/N), dual SMBus interfaces (MSMBCLK/DAT, SSMBCLK/DAT + address pins), 9 GPIOs with multiple alternate functions (e.g., PARTxPERSTN, PxxLINKUPN), JTAG test signals, and configuration strapping pins (STKxCfg, SWMODE, CLKMODE).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PCIe Gen2 switching applications.

Compared with the 89H32NT24AG2ZAHL8, the LAN9668 offers integration with Ethernet but sacrifices NTB and scalability, while the PEX8747 delivers Gen3 performance at the cost of increased power, size, and design complexity-making the 89H32NT24AG2ZAHL8 optimal for cost-sensitive, Gen2-focused multi-domain systems requiring proven RAS and partitioning.

Availability

89H32NT24AG2ZAHL8 is available at Aetrix Electronics and suitable for servers, storage arrays, communications equipment, and embedded multi-processor systems requiring stable component supply, long-term lifecycle support, and validated PCIe Gen2 switching functionality.

Supply support for 89H32NT24AG2ZAHL8 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

IDT (Integrated Device Technology, Inc.) is a fabless semiconductor company specializing in timing, RF, memory interface, and PCIe interconnect solutions, acquired by Renesas Electronics in 2019.

The 89H32NT24AG2ZAHL8 belongs to IDT's PES (PCI Express Switch) family, designed specifically for high-reliability, multi-host PCIe Gen2 system interconnects in enterprise and telecom infrastructure.

FAQ

What is the primary function of the 89H32NT24AG2ZAHL8 in a PCIe system?

The 89H32NT24AG2ZAHL8 serves as a high-performance, non-blocking PCIe Gen2 system interconnect switch with integrated non-transparent bridging (NTB) and switch partitioning. Its core function is to enable secure, low-latency communication between multiple PCIe domains-such as CPUs, storage controllers, or accelerators-without requiring shared memory or OS-level coordination. The 89H32NT24AG2ZAHL8 achieves this through hardware-accelerated address translation, doorbell signaling, and up to eight independent switch partitions.

Does the 89H32NT24AG2ZAHL8 support PCIe Gen3 speeds?

No, the 89H32NT24AG2ZAHL8 is compliant only with PCI Express Base Specification 2.1 and operates at Gen2 speeds (5.0 GT/s) per lane. It does not support Gen3 (8.0 GT/s) signaling or associated electrical requirements. While it maintains backward compatibility with Gen1 (2.5 GT/s), any design requiring Gen3 bandwidth must use a different switch, such as the AMD/Spansion PEX8747, which is not pin-compatible with the 89H32NT24AG2ZAHL8.

How many non-transparent bridge (NTB) endpoints does the 89H32NT24AG2ZAHL8 support?

The 89H32NT24AG2ZAHL8 supports up to eight independent NTB endpoints. Each endpoint provides six BARs (Base Address Registers) for memory window mapping, 32-bit doorbell registers for event signaling, and four 32-bit message registers for mailbox-style inter-domain communication. This allows the 89H32NT24AG2ZAHL8 to connect up to eight separate PCIe root complexes or endpoints in isolated domains while maintaining full Gen2 bandwidth per link.

What package type and dimensions does the 89H32NT24AG2ZAHL8 use?

The 89H32NT24AG2ZAHL8 is packaged in a 484-ball Flip Chip Ball Grid Array (FC-BGA) with 23 mm × 23 mm body size and 1 mm ball pitch. It includes an exposed thermal pad on the underside for enhanced heat dissipation. This package is industry-standard for high-pin-count, high-power interconnect ICs and supports automated PCB assembly with standard reflow profiles.

Can the 89H32NT24AG2ZAHL8 be configured for different port topologies without changing hardware?

Yes, the 89H32NT24AG2ZAHL8 supports flexible port configuration via hardware strapping (STKxCfg pins) and runtime software control. It organizes its 24 ports into four x8 stacks, each configurable as x8, x4, x2, or x1-or combinations thereof-without modifying the PCB layout. Automatic lane-width negotiation and reversal further simplify interoperability with diverse endpoint configurations, making the 89H32NT24AG2ZAHL8 adaptable to evolving system requirements post-deployment.