Renesas IDT79RC32V332-100DH

Overview

IDT79RC32V332-100DH from Integrated Device Technology, Inc. is a 32-bit integrated communications processor based on the RISCore 32300 CPU core implementing the Enhanced MIPS-II ISA. It operates at up to 100 MHz, integrates SDRAM and PCI controllers, supports 3.3V I/O with 3.3V core supply, and targets embedded networking and communications systems requiring high integration and low-cost memory interfacing.

For engineers reviewing the IDT79RC32V332-100DH datasheet, IDT79RC32V332-100DH pinout, IDT79RC32V332-100DH application, or IDT79RC32V332-100DH equivalent, this page delivers verified technical context, validated pin functions, confirmed cache and bus timing parameters, and real-world use cases in telecom edge devices, industrial gateways, and legacy PCI-based embedded controllers.

Technical Context

The IDT79RC32V332-100DH implements a 5-stage scalar pipeline RISCore 32300 CPU core with 8KB 2-way set associative instruction cache and 2KB 2-way set associative data cache, supporting write-back, write-through, and cache locking per line. It includes an on-chip MMU with 32-page TLB and full big/little-endian support for OS compatibility.

It integrates a 32-bit PCI 2.2-compliant bridge (50 MHz), SDRAM controller supporting 4 banks and up to 512MB total capacity, local memory/I/O controller with 6 chip-selects (up to 8MB/bank), 4-channel DMA with scatter/gather and unaligned transfer support, and peripherals including UART (16550-compatible, up to 1.5 Mb/s), SPI master, four 32-bit timers, and programmable I/O.

Key Specifications

Pinout & Package

Package: 208-pin Quad Flat Pack (QFP), 28 × 28 mm body, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar integrated communications processor applications.

Compared with AMD Alchemy Au1500 and NXP MPC8245, the IDT79RC32V332-100DH offers unique balance of mature MIPS software support, native PCI 2.2 integration, and SDRAM cost optimization - making it optimal for cost-sensitive, PCI-dependent embedded systems where upgrade path to newer architectures is not required.

Availability

IDT79RC32V332-100DH is available at Aetrix Electronics and suitable for telecom edge routers, industrial protocol gateways, and legacy PCI-based test equipment requiring stable component supply, long-lifecycle support, and proven qualification in commercial-temperature environments.

Supply support for IDT79RC32V332-100DH 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 communications ICs before its acquisition by Renesas Electronics in 2019. IDT pioneered high-integration communications processors for embedded networking.

The IDT79RC32V332-100DH belongs to the Interprise™ family of integrated communications processors, designed specifically to replace discrete CPU + bridge + memory controller combinations in cost-sensitive, PCI-based embedded systems with single-chip integration and MIPS software compatibility.

FAQ

What is the maximum operating frequency of the IDT79RC32V332-100DH?

The IDT79RC32V32V332-100DH is rated for operation up to 100 MHz, as indicated by the "-100" suffix in its part number. This frequency applies to the cpu_masterclk input and governs the CPU core, cache, and synchronous peripheral timing. The local bus supports up to 75 MHz, and the PCI interface runs at up to 50 MHz - all derived from the same master clock domain with internal dividers.

Does the IDT79RC32V332-100DH support both PCI host and satellite modes?

Yes, the IDT79RC32V332-100DH supports both PCI host and satellite modes. In host mode, it initiates PCI transactions and grants bus access to peripherals. In satellite mode, it acts as a PCI target and can perform warm resets via pci_rst_n. Mode selection is controlled by mem_addr[20], and the device includes an on-chip two-slot arbiter and serial EEPROM support for configuration loading.

What SDRAM configurations does the IDT79RC32V332-100DH support?

The IDT79RC32V332-100DH supports SDRAM devices with densities from 16Mb to 512Mb across 4 independent banks, enabling up to 512MB total system memory. It directly controls discrete SDRAM chips, SODIMMs, and DIMMs with automatic refresh generation, programmable address mapping, and on-chip page comparators to minimize access latency - no external SDRAM controller logic is required.

How is debug supported on the IDT79RC32V332-100DH?

The IDT79RC32V332-100DH provides comprehensive debug support via IEEE 1149.1 JTAG and enhanced EJTAG interfaces. It includes ejtag_tpc (real-time program counter output), ejtag_pcst (pipeline trace status), and ejtag_debugboot (debug exception at reset). These features enable non-intrusive in-circuit emulation, real-time trace, and secure boot debugging without halting system operation.

Is the IDT79RC32V332-100DH pin-compatible with other RC32332 variants?

Yes, the IDT79RC32V332-100DH shares the same 208-pin QFP package and pinout as other RC32332 family members, including speed grades (-150, -125) and voltage variants (2.5V/3.3V core). Pin functions, reset states, and alternate signal mappings (e.g., mem_addr[21:20] for boot mode, spi_mosi/miso/sck for EEPROM loading) are consistent across the family per the official IDT datasheet DSC 5701.