Renesas IDT79RV4640-180DU

Overview

IDT79RV4640-180DU from Integrated Device Technology is a 3.3V, 64-bit MIPS-III RISC microprocessor with integrated floating-point coprocessor, 8KB instruction cache, 8KB data cache, and 267 MHz integer CPU core - delivering 352 Dhrystone MIPS and 89 MFlops at 267 MHz for embedded internetworking and multimedia applications.

For engineers reviewing the IDT79RV4640-180DU datasheet, IDT79RV4640-180DU pinout, IDT79RV4640-180DU application, or IDT79RV4640-180DU equivalent, key selection criteria include its 180 MHz rated frequency, 32-bit synchronized system bus interface, on-chip cache locking support, and software compatibility with IDT RC4000/RC32300 families.

Technical Context

The IDT79RV4640-180DU implements a 5-stage pipeline with full MIPS-III ISA compliance, including 64-bit general-purpose registers, HI/LO multiply/divide registers, and 32 single-precision floating-point registers. It supports virtual-to-physical address translation via CP0 base-bounds registers without TLB dependency.

Its integer execution engine delivers 133.5 M Mul-Add/sec at 267 MHz using dedicated MAD/U instructions and optimized operand-size detection; the floating-point unit executes IEEE 754 single-precision operations with 8-cycle MUL and 32-cycle DIV latency, while trapping double-precision attempts for software emulation.

Key Specifications

Pinout & Package

Package: 256-pin Ceramic Pin Grid Array (CPGA), 35.56 mm × 35.56 mm, 1.27 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 64-bit embedded RISC processor applications.

Compared with IDT79RV4640-180DU, the 5V IDT79RC4640-180DU requires board-level voltage redesign and offers no performance gain, while IDT79RC4650-180DU delivers measurable uplift in FPU capability and cache capacity - making it the only viable path for compute-bound upgrades without architecture change.

Availability

IDT79RV4640-180DU is available at Aetrix Electronics and suitable for router control planes, industrial print controllers, DSP-augmented media gateways, and legacy protocol converters requiring stable component supply across extended product lifecycles.

Supply support for IDT79RV4640-180DU 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 high-performance timing, memory interface, RF, and embedded processor solutions before its acquisition by Renesas Electronics in 2019.

IDT79RV4640-180DU belongs to the RC4000 family of embedded RISC processors, designed specifically to deliver 64-bit performance in cost-sensitive, power-constrained systems such as networking edge devices and real-time multimedia appliances.

FAQ

What is the operating voltage range for IDT79RV4640-180DU?

IDT79RV4640-180DU operates at 3.3 V ± 0.3 V, as indicated by the "RV" prefix in its part number. This distinguishes it from the 5V "R"-series variants and ensures compatibility with modern low-voltage system designs. The device includes internal regulation and power management circuitry to maintain stable core operation across the specified range, and it does not support dual-supply or mixed-voltage I/O configurations.

Does IDT79RV4640-180DU support double-precision floating-point arithmetic?

IDT79RV4640-180DU does not implement double-precision floating-point operations in hardware. Attempts to execute double-precision instructions trigger a trap to the integer unit, enabling software emulation. Its on-chip FPU is strictly single-precision IEEE 754 compliant, delivering 89 MFlops at 267 MHz. For native double-precision, IDT79RC4650-180DU is the documented migration path.

How is cache locking implemented in IDT79RV4640-180DU?

IDT79RV4640-180DU supports cache locking exclusively on Set A of both instruction and data caches via dedicated bits in CP0 registers (Config and CAlg). When enabled, locked lines in Set A cannot be overwritten by cache misses, preserving time-critical code or data. This feature is used in real-time applications to guarantee worst-case execution time without requiring full cache disable or external SRAM.

Is IDT79RV4640-180DU pin-compatible with other RC4000 family members?

IDT79RV4640-180DU is socket-compatible with IDT RC64474 and RC64574 processors, and shares the same 256-pin CPGA package outline and signal mapping. However, it is not pin-compatible with RC4650 variants that integrate additional debug or memory controller pins - those require PCB layout revision despite mechanical fit.

What boot-time configuration options are available for IDT79RV4640-180DU?

IDT79RV4640-180DU initializes via a 256-bit serial boot stream driven by MasterClock/256, configuring PLL multiplier, cache write policy, bus timing modes, and exception vector mapping. These settings are latched at power-on reset and cannot be altered dynamically. Configuration is typically stored in low-cost EPROM or generated by companion ASIC logic during startup.