Renesas IDT79RV4650-267DP

Overview

IDT79RV4650-267DP from Integrated Device Technology is a 3.3V, 267 MHz, 64-bit RISC microprocessor implementing the MIPS-III ISA with integrated integer multiply-accumulate (133.5 M MAC/sec), dual 8KB instruction/data caches, and on-chip single-precision floating-point co-processor. It targets embedded networking, multimedia, and real-time control systems requiring deterministic response and high integer throughput.

For engineers reviewing the IDT79RV4650-267DP datasheet, IDT79RV4650-267DP pinout, IDT79RV4650-267DP application, or IDT79RV4650-267DP equivalent, key selection criteria include its 267 MHz pipeline clock, 32-bit/64-bit configurable system interface, cache locking support for real-time code, and software compatibility with IDT RC3000/RC4000 families.

Technical Context

The IDT79RV4650-267DP uses a 5-stage integer pipeline with autonomous multiply/divide unit and dedicated MAD (multiply-add) instruction supporting atomic 16-/32-bit integer MAC operations at 267 MHz. Its CP0 system control co-processor implements base-bounds virtual-to-physical address translation without TLB, enabling multi-tasking in constrained memory systems.

It integrates separate 8KB two-way set-associative instruction and data caches, both parity-protected and lockable per set (Set A), with write-back/write-through policies controlled via CP0 CAlg register. The on-chip single-precision FPU executes IEEE 754 operations with 4-cycle ADD/SUB latency and 8-cycle MUL latency, but signals traps on double-precision instructions.

Key Specifications

Pinout & Package

Package: 352-pin Ceramic Pin Grid Array (CPGA), 52.32 mm × 52.32 mm, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT79RC4650-267DP and IDT79RC64475-266DP, the IDT79RV4650-267DP delivers identical 267 MHz integer performance and cache architecture at 3.3V, reducing system power and simplifying voltage regulation-making it optimal for thermally constrained embedded designs where double-precision FP is emulated in software.

Availability

IDT79RV4650-267DP is available at Aetrix Electronics and suitable for network infrastructure, industrial motion control, and digital media processing applications requiring stable component supply across extended product lifecycles.

Supply support for IDT79RV4650-267DP 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) was a fabless semiconductor company specializing in high-performance timing, memory interface, and embedded processor solutions before its acquisition by Renesas in 2019.

The IDT79RV4650-267DP belongs to IDT's RISController family of 64-bit embedded microprocessors, designed specifically for cost-sensitive, real-time embedded systems requiring high integer throughput, deterministic cache behavior, and software compatibility across generations.

FAQ

What is the core voltage requirement for IDT79RV4650-267DP?

IDT79RV4650-267DP operates at a nominal 3.3V core supply, as indicated by the "RV" prefix in its part number (per IDT documentation). This distinguishes it from the 5V "R"-suffixed variants like IDT79RC4650-267DP. The 3.3V operation reduces power consumption and thermal dissipation, making IDT79RV4650-267DP suitable for compact, fanless embedded systems where thermal management is critical.

Does IDT79RV4650-267DP support double-precision floating-point arithmetic?

IDT79RV4650-267DP does not implement double-precision floating-point operations in hardware. When double-precision instructions are executed, the processor signals a trap to the CPU, allowing software emulation. This design choice reduces die size and power versus the IDT79RC64475, which includes native double-precision FPU. For applications requiring double-precision, IDT79RV4650-267DP relies on compiler-inserted library calls or runtime trap handlers.

Is IDT79RV4650-267DP pin-compatible with other IDT RISController processors?

IDT79RV4650-267DP is socket-compatible with IDT RC64475 and RC64575 processors, as confirmed in the official IDT documentation. It shares the same 352-pin CPGA package and pinout, enabling direct migration paths. However, electrical differences (e.g., 3.3V vs. 5V supply, timing margins) require validation of surrounding circuitry-including voltage regulators, termination, and clock distribution-before drop-in replacement.

How does cache locking function in IDT79RV4650-267DP?

IDT79RV4650-267DP allows locking of Set A in both instruction and data caches via dedicated bits in CP0 registers. Once locked, lines in Set A cannot be evicted by cache misses, ensuring time-critical code or data remains resident. This guarantees bounded interrupt latency and deterministic execution-essential for hard real-time applications such as motion control or packet forwarding where cache-induced jitter must be eliminated.

What system bus widths does IDT79RV4650-267DP support?

IDT79RV4650-267DP supports both 32-bit and 64-bit synchronous system interfaces, configurable at boot time. In 32-bit mode, the SysAD bus operates as a multiplexed address/data path with reduced pin count and lower-cost memory subsystems (e.g., 32-bit SDRAM). In 64-bit mode, it achieves up to 1000 MB/sec bandwidth-enabling high-throughput applications like video processing or multi-gigabit networking without external bus bridging.