Renesas IDT79RV4640-150DU

Overview

IDT79RV4640-150DU from Integrated Device Technology is a 3.3V, 150 MHz, 64-bit MIPS III–compliant RISC microprocessor with integrated floating-point coprocessor, 8 KB instruction cache, and 8 KB data cache. It delivers 352 Dhrystone MIPS and 89 MFLOPS for embedded control and integer DSP workloads in internetworking and multimedia systems.

For engineers reviewing the IDT79RV4640-150DU datasheet, IDT79RV4640-150DU pinout, IDT79RV4640-150DU application, or IDT79RV4640-150DU equivalent, key selection criteria include its 150 MHz pipeline clock, 32-bit synchronized system bus interface, on-chip cache locking support, and software compatibility with IDT RC4000 family processors.

Technical Context

The IDT79RV4640-150DU implements a 5-stage integer pipeline with autonomous multiply/divide unit and supports MIPS-III ISA extensions including MUL and MAD instructions for accelerated integer multiply-accumulate operations. Its floating-point coprocessor executes single-precision IEEE 754 operations with 4-cycle ADD/SUB latency and 8-cycle MUL latency.

Cache subsystem uses two-way set-associative 8 KB instruction and 8 KB data caches, both virtually indexed and physically tagged, with write-back policy and lockable Set A. System interface operates at up to 125 MHz bus clock, generating internal 150 MHz pipeline clock via on-chip PLL multiplier.

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 IDT79RV4640-150DU, the 5V IDT79RC4640-150DU offers identical performance at higher voltage and power, while IDT79RC4650-150DU adds double-precision FPU and debug enhancements - making the RV variant optimal for cost- and power-sensitive 3.3 V embedded systems requiring only single-precision compute.

Availability

IDT79RV4640-150DU is available at Aetrix Electronics and suitable for router control planes, industrial print controllers, and medical imaging front-ends requiring stable component supply across extended production lifecycles.

Supply support for IDT79RV4640-150DU 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 embedded processor solutions before its acquisition by Renesas Electronics in 2019.

The IDT79RV4640-150DU belongs to the RC4000 family of high-integration 64-bit RISC processors designed for cost-sensitive, performance-driven embedded applications such as internetworking equipment and consumer multimedia systems.

FAQ

What is the maximum operating frequency of the IDT79RV4640-150DU?

The IDT79RV4640-150DU is rated for a maximum pipeline clock frequency of 150 MHz, derived from an external 125 MHz system bus clock via on-chip PLL multiplication. This frequency is guaranteed across commercial temperature range (0°C to +70°C) and 3.3 V ±0.3 V supply, with timing margins validated per IDT's hardware user manual.

Does the IDT79RV4640-150DU support double-precision floating-point operations?

No, the IDT79RV4640-150DU implements only single-precision IEEE 754 floating-point arithmetic in its on-chip coprocessor. Double-precision operations trigger a trap exception, requiring software emulation. For native double-precision support, IDT offered the pin-compatible IDT79RC4650-150DU variant.

Is the IDT79RV4640-150DU pin-compatible with other RC4000 family processors?

Yes, the IDT79RV4640-150DU is socket-compatible with IDT RC64474 and RC64574 processors and shares identical pinout and electrical interface specifications with the IDT79RC4640-150DU, differing only in supply voltage (3.3 V vs. 5 V) and associated power delivery requirements.

What cache locking capability does the IDT79RV4640-150DU provide?

The IDT79RV4640-150DU supports locking of Set A in both its 8 KB instruction and 8 KB data caches via CP0 register configuration. This reserves 4 KB of each cache for time-critical code or data, preventing eviction during cache misses and ensuring deterministic execution latency for real-time tasks.

How does the IDT79RV4640-150DU handle virtual-to-physical address translation?

The IDT79RV4640-150DU implements base-bounds address translation using CP0 registers IBase/IBound and DBase/DBound, enabling multiple user processes to share physical memory without a TLB. Kernel-mode addresses use fixed kseg0/kseg1/kseg2 mapping, while user-mode accesses are validated against bounds before base-offset physical address generation.