Renesas IDT79RV4640-133DU

Overview

IDT79RV4640-133DU from Integrated Device Technology is a 3.3V, 133 MHz, 64-bit MIPS-III RISC microprocessor with integrated floating-point coprocessor, 8 KB instruction cache, and 8 KB data cache. It delivers 352 Dhrystone MIPS and 89 MFlops single-precision performance for embedded control and DSP-intensive tasks in internetworking and multimedia systems.

For engineers reviewing the IDT79RV4640-133DU datasheet, IDT79RV4640-133DU pinout, IDT79RV4640-133DU application, or IDT79RV4640-133DU equivalent, key selection criteria include its 133 MHz pipeline clock, 32-bit synchronized system bus interface, on-chip cache locking for deterministic real-time response, and software compatibility with IDT RC4000 and RC32300 families.

Technical Context

The IDT79RV4640-133DU implements a 5-stage integer pipeline with autonomous multiply/divide unit and dedicated floating-point execution units compliant with IEEE 754 single-precision arithmetic. Its CP0 system control coprocessor supports base-bounds virtual memory mapping without TLB, enabling multiple user tasks in shared physical memory.

Cache subsystem uses two-way set-associative organization with 32-byte line size, write-back policy (software-selectable write-through), and per-set locking (Set A) for time-critical code. The on-chip floating-point unit executes ADD/SUB/MUL in 4–8 cycles and DIV/SQRT in 31–32 cycles, with precise exception handling.

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 IDT79RC4640-133DU, the IDT79RV4640-133DU offers identical performance at 3.3 V for reduced power and thermal design margin, while IDT79RC4650-133DU adds system-level peripherals at the cost of larger die size and non-interchangeable packaging.

Availability

IDT79RV4640-133DU is available at Aetrix Electronics and suitable for router control planes, industrial printer controllers, digital media set-top boxes, and medical imaging front-ends requiring stable component supply across extended product lifecycles.

Supply support for IDT79RV4640-133DU 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.

The IDT79RV4640-133DU belongs to the RC4000 family of embedded RISC processors, designed specifically for cost-sensitive, high-throughput applications in internetworking, office automation, and consumer multimedia where 64-bit performance must be delivered via a 32-bit system bus.

FAQ

What is the operating voltage specification for the IDT79RV4640-133DU?

The IDT79RV4640-133DU operates at a nominal 3.3 V core supply, as indicated by the "RV" prefix in its part number (R = 5V, RV = 3.3V, RC = dual-voltage). This voltage level reduces active and standby power consumption compared to 5V variants like the IDT79RC4640-133DU, and ensures compatibility with contemporary 3.3 V I/O standards and memory interfaces used in embedded networking equipment.

Does the IDT79RV4640-133DU support double-precision floating-point operations?

No, the IDT79RV4640-133DU does not implement double-precision floating-point operations in hardware. Its on-chip floating-point coprocessor is single-precision IEEE 754 compliant. Attempts to execute double-precision instructions trigger a CPU trap, allowing software emulation via library routines or compile-time selection of FP64 emulation-ensuring binary compatibility while maintaining silicon area and power efficiency.

How does cache locking function in the IDT79RV4640-133DU and why is it important?

The IDT79RV4640-133DU allows locking of Set A in both instruction and data caches via CP0 configuration registers. Once locked, lines in Set A cannot be evicted by cache misses, preserving critical code or data in on-chip memory. This guarantees bounded worst-case execution time for real-time interrupt service routines or safety-critical firmware modules-essential in medical imaging and industrial control applications where deterministic latency is mandatory.

Is the IDT79RV4640-133DU pin-compatible with other members of the RC4640 family?

Yes, the IDT79RV4640-133DU is socket-compatible with IDT RC64474 and RC64574 processors and shares identical pinout and package dimensions with the IDT79RC4640-133DU. The only electrical difference is the core supply voltage (3.3 V vs. 5 V), meaning PCB layout and signal routing remain unchanged-enabling voltage-scaling upgrades without board revision.

What boot-time configuration options are available for the IDT79RV4640-133DU?

The IDT79RV4640-133DU initializes fundamental operational modes-including bus width, cache enable/disable, memory mapping mode, and PLL multiplier-via a 256-bit serial boot stream read after VCCOK assertion. This low-frequency (MasterClock/256) interface allows configuration storage in low-cost EPROM or generation by an ASIC, providing flexible system initialization without external configuration pins or jumpers.