Renesas IDT79RC32V334-150BBG

Overview

IDT79RC32V334-150BBG from Integrated Device Technology is a 32-bit integrated communications processor based on the RISCore32300 CPU core implementing the Enhanced MIPS-II ISA. It operates at up to 150 MHz, integrates an 8 kB 2-way set associative instruction cache and 2 kB 2-way set associative data cache, supports big/little endian operation, and includes an MMU with 32-page TLB. It targets embedded networking and communications systems requiring high integration of memory controllers, PCI bridge, and dual UARTs.

For engineers reviewing the IDT79RC32V334-150BBG datasheet, IDT79RC32V334-150BBG pinout, IDT79RC32V334-150BBG application, or IDT79RC32V334-150BBG equivalent, key selection considerations include its 256-ball PBGA package, 32-bit PCI 2.2 interface at 66 MHz, SDRAM controller supporting up to 512 MB across 4 banks, dual 16550-compatible UARTs with 1.5 Mb/s baud rate, and EJTAG debug support for in-circuit emulation.

Technical Context

The IDT79RC32V334-150BBG implements a 5-stage scalar pipeline CPU core executing at 150 MHz, with cache prefetch and conditional move instructions optimized for routing and DSP algorithms. Its memory subsystem includes programmable cache write policies (write-through no-write-allocate, write-through write-allocate, write-back) and per-line cache locking for real-time determinism.

The integrated peripherals include a 32-bit local bus interface operating up to 75 MHz with 26-bit addressing, a full 32-bit PCI 2.2 bridge supporting host/satellite modes and serial EEPROM configuration, four 32-bit timers, SPI master mode, and a 4-channel DMA controller supporting scatter/gather, unaligned transfers, and burst sizes up to 16 bytes.

Key Specifications

Pinout & Package

The IDT79RC32V334-150BBG is housed in a 256-ball plastic ball grid array (PBGA) package with 1.0 mm ball pitch, designed for surface-mount assembly and thermal dissipation under ≤2.1 W peak power in commercial temperature range (0°C to +70°C).

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 IDT79RC32V334-150BBG offers superior MIPS software continuity, finer-grained cache control for real-time tasks, and native PCI 2.2 host support-making it optimal for cost-sensitive, Linux-based communications platforms where legacy MIPS code reuse and PC peripheral interoperability are critical.

Availability

IDT79RC32V334-150BBG is available at Aetrix Electronics and suitable for network router control planes, VoIP gateways, industrial protocol gateways, and legacy system interface adapters requiring stable component supply and long-term lifecycle support.

Supply support for IDT79RC32V334-150BBG 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 high-performance embedded processors for communications and computing markets.

The IDT79RC32V334-150BBG belongs to the Interprise™ integrated communications processor family, designed to deliver MIPS-compatible processing with tightly coupled memory, I/O, and PCI subsystems for rapid deployment of cost-optimized embedded networking systems.

FAQ

What is the maximum operating frequency of the IDT79RC32V334-150BBG CPU core?

The IDT79RC32V32V334-150BBG CPU core operates at up to 150 MHz. This frequency is guaranteed under commercial temperature conditions (0°C to +70°C) with 3.3 V supply and specified timing margins. The "150" in the part number explicitly denotes this maximum clock rating, and the RISCore32300 core achieves this performance using a 5-stage scalar pipeline with cache prefetch and conditional move instructions.

Does the IDT79RC32V334-150BBG support both big-endian and little-endian operation?

Yes, the IDT79RC32V334-150BBG supports both big-endian and little-endian operation modes. This capability is implemented at the RISCore32300 CPU core level and extends to the local bus interface, UARTs, and DMA controller. Endianness is configured via dedicated mode bits (mem_addr[22:20]) during reset, allowing seamless integration with heterogeneous systems and legacy software stacks.

What types of memory does the SDRAM controller in the IDT79RC32V334-150BBG support?

The IDT79RC32V334-150BBG SDRAM controller supports discrete SDRAM chips, SODIMMs, and DIMMs with device densities from 16 Mb to 512 Mb. It manages up to 4 non-interleaved banks, enabling up to 512 MB total capacity. The controller generates automatic refresh cycles and supports programmable address mapping, but does not support DDR or LPDDR memory technologies.

Can the IDT79RC32V334-150BBG function as a PCI bus master and target simultaneously?

No-the IDT79RC32V334-150BBG operates in either PCI host (master) mode or satellite (target) mode, selected at reset via mem_addr[20]. In host mode, it initiates PCI transactions and controls the bus; in satellite mode, it responds to configuration reads/writes and can generate PCI interrupts (e.g., via pci_inta_n), but cannot act as a bus master. The mode is static and not runtime reconfigurable.

Is JTAG debugging supported on the IDT79RC32V334-150BBG, and what standard does it follow?

Yes, the IDT79RC32V334-150BBG includes full IEEE Std. 1149.1-compliant JTAG boundary-scan support and extends it with EJTAG (Enhanced JTAG) for in-circuit emulation. The EJTAG interface enables real-time program counter visibility, breakpoint insertion, and register inspection using low-cost emulators compatible with the RC32364 platform, significantly accelerating firmware bring-up and validation.