Renesas 89H48H12G2ZDBLGI

Overview

The 89H48H12G2ZDBLGI from IDT is a 48-lane, 12-port PCI Express Gen2 system interconnect switch with x4/x8 port configurability, 5.0 GT/s per lane, full PCIe Base 2.0 compliance, and integrated SerDes supporting Gen1/Gen2 operation - deployed in high-throughput server and storage interconnects.

For engineers reviewing the 89H48H12G2ZDBLGI datasheet, 89H48H12G2ZDBLGI pinout, 89H48H12G2ZDBLGI application, or 89H48H12G2ZDBLGI equivalent, key selection criteria include non-blocking switching capacity (48 GBps), dynamic switch partitioning support (up to 12 partitions), QoS arbitration (WRR + request metering), hot-plug controller integration per port, and dual-power supply (1.0 V / 2.5 V) simplicity.

Technical Context

The 89H48H12G2ZDBLGI implements a Combined Input Output Queued (CIOQ) switch core with large frame buffers and cut-through latency architecture, enabling sub-100 ns forwarding for posted transactions. It supports up to 128-byte to 2-KB payload sizes and enforces end-to-end CRC (ECRC) regeneration across multicast paths.

Its port-level SerDes configuration includes per-lane de-emphasis, receive equalization, and drive strength control; clocking supports 100 MHz / 125 MHz reference inputs in common-clock or non-common-clock modes, with local port clock and SSC capability.

Key Specifications

Pinout & Package

676-ball Flip Chip BGA (FCBGA), 27 mm × 27 mm, 1.0 mm ball pitch, RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with the 89H48H12G2ZDBLGI, the TR-packaged 89H48H12G2ZDBLGI8 offers identical functionality with optimized logistics for high-volume manufacturing, while the extended-temp 89H48H12G2ZDBLGIT adds thermal robustness at no speed or feature trade-off - both retain full switch partitioning, QoS, and hot-plug capabilities.

Availability

The 89H48H12G2ZDBLGI is available at Aetrix Electronics and suitable for server backplanes, modular storage controllers, and intelligent I/O expansion chassis requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 89H48H12G2ZDBLGI 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 (IDT) is a fabless semiconductor company specializing in timing, memory interface, RF, and interconnect solutions, acquired by Renesas Electronics in 2019.

The 89H48H12G2ZDBLGI belongs to IDT's PRECISE™ PCIe switch family, engineered for high-reliability, high-throughput system interconnects in data center, telecom, and industrial infrastructure.

FAQ

What is the maximum payload size supported by the 89H48H12G2ZDBLGI?

The 89H48H12G2ZDBLGI supports a configurable maximum payload size ranging from 128 bytes to 2 KB, as defined by the PCIe Base Specification 2.0. This setting is controlled per-port via configuration space registers and directly impacts transaction efficiency and buffer utilization in high-bandwidth applications like GPU peer-to-peer transfers.

Does the 89H48H12G2ZDBLGI support PCIe Gen3 or higher data rates?

No, the 89H48H12G2ZDBLGI is strictly a PCIe Gen2 device, supporting 2.5 GT/s and 5.0 GT/s per lane only. It does not implement Gen3 (8.0 GT/s) or later PHY layers. Its SerDes architecture and compliance certification are limited to PCIe Base Specification 2.0, and no firmware or hardware upgrade path to Gen3 exists.

How many independent switch partitions can be configured on the 89H48H12G2ZDBLGI?

The 89H48H12G2ZDBLGI supports up to 12 fully independent switch partitions, each with dedicated route tables, arbitration logic, and configurable downstream device numbering. Partition boundaries are software-defined and can be reconfigured dynamically without resetting the device - enabling secure multi-tenant resource isolation in virtualized environments.

Is external EEPROM required for 89H48H12G2ZDBLGI initialization?

No, the 89H48H12G2ZDBLGI supports three initialization methods: Root Complex (BIOS/OS/driver), SMBus, or Serial EEPROM. Pin-strapped default configurations eliminate external EEPROM for basic topologies, while in-system EEPROM programming via SMBus allows field-updatable settings without hardware modification.

What power states does the 89H48H12G2ZDBLGI support for Active State Power Management (ASPM)?

The 89H48H12G2ZDBLGI supports L0s and L1 ASPM link states, with configurable entry timers for both. It also implements D0 (active), D3hot (soft off), and D3 (mechanical off) device states. SerDes power savings include lane-specific shutdown and half-swing mode - reducing idle power by up to 40% versus full-swing operation.