Renesas IDT79RV4700-200GH

Overview

IDT79RV4700-200GH from Integrated Device Technology is a 64-bit RISC microprocessor implementing the MIPS-III ISA, operating at 200 MHz with 3.3V supply, featuring 16KB instruction and 16KB data caches, a flexible MMU with 96-entry fully associative TLB, and integrated floating-point co-processor supporting IEEE 754 single/double precision arithmetic. It targets high-performance embedded networking and printing systems requiring deterministic real-time memory management and low-power operation.

For engineers reviewing the IDT79RV4700-200GH datasheet, IDT79RV4700-200GH pinout, IDT79RV4700-200GH application, or IDT79RV4700-200GH equivalent, key selection criteria include 200 MHz clock speed, 3.3V core voltage, 64GB physical address space, software/pin-compatibility with R4XXX family, and support for pipelined writes and standby mode power management.

Technical Context

The IDT79RV4700-200GH uses a simple 5-stage pipeline with integer and floating-point units executing in parallel, enabling 260 Dhrystone MIPS and 100 MFLOP/s peak performance. Its virtual memory system supports user/supervisor/kernel modes with 256GB/256.5GB/1024GB virtual address spaces respectively in 32-bit mode, and upward-compatible 64-bit extension.

Memory management relies on a two-way set associative 16KB instruction cache and 16KB data cache (both virtually indexed, physically tagged), backed by an instruction TLB (2 entries), data TLB (4 entries), and joint TLB (96 entries). Cache coherency attributes per page include uncached, non-coherent write-back, and non-coherent write-through options.

Key Specifications

Pinout & Package

Package: 208-pin QFP (Plastic Quad Flat Pack), cavity-down construction optimized for thermal dissipation in industrial ambient conditions (0°C to +85°C case temperature).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT79R4700-200GH, the 5V IDT79R4700-200GH offers identical functionality at higher power and thermal cost, while the RC64474 provides identical compute capability in a thermally superior PGA package-neither is pin-compatible without board revision, but both share binary software compatibility.

Availability

IDT79RV4700-200GH is available at Aetrix Electronics and suitable for LAN switch control, router forwarding engines, color printer controllers, and industrial embedded gateways requiring stable component supply across extended product lifecycles.

Supply support for IDT79RV4700-200GH 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, RF, and embedded processor solutions before its acquisition by Renesas Electronics in 2019.

The IDT79RV4700-200GH belongs to IDT's RC4700 family of 64-bit MIPS-III microprocessors, designed specifically for embedded networking, printing, and real-time control applications demanding high instruction throughput, deterministic memory management, and low-voltage operation.

FAQ

What is the core voltage requirement for the IDT79RV4700-200GH?

The IDT79RV4700-200GH operates at 3.3 V nominal core supply voltage, distinguishing it from the 5V IDT79R4700-200GH variant. This reduced voltage lowers dynamic power consumption and thermal output, making the IDT79RV4700-200GH suitable for thermally constrained embedded systems such as compact routers and color printers. The 3.3V specification is confirmed in the December 2008 datasheet revision and applies across the full 0°C to +85°C case temperature range.

Is the IDT79RV4700-200GH pin-compatible with other members of the R4XXX family?

Yes, the IDT79RV4700-200GH is explicitly documented as both software and pin-compatible with the R4XXX processor family, including the R4640, R4650, and R5000. This compatibility extends to the 208-pin QFP package variant, allowing reuse of PCB layouts and peripheral interfaces. However, designers must verify voltage-level alignment between the 3.3V IDT79RV4700-200GH and legacy 5V R4XXX components in mixed-supply systems.

What cache architecture does the IDT79RV4700-200GH implement?

The IDT79RV4700-200GH implements separate 16KB two-way set associative instruction and data caches, both virtually indexed and physically tagged. The instruction cache supports 64-bit fetches at 800 MB/s peak bandwidth, while the data cache delivers 1.6 GB/s peak bandwidth with write-back policy and per-page write-through configurability. These caches are backed by a hierarchical TLB structure including ITLB (2 entries), DTLB (4 entries), and JTLB (96 entries).

Does the IDT79RV4700-200GH support IEEE 754 floating-point arithmetic?

Yes, the IDT79RV4700-200GH integrates a full IEEE 754-compliant floating-point co-processor supporting both single and double precision operations including ADD, SUB, MUL, DIV, SQRT, FIX, FLOAT, and CMP. Latency values-for example, 4 cycles for single-precision ADD and 61 cycles for double-precision DIV-are specified in the hardware user's manual. Precise exception handling is maintained even during overlapped and pipelined operations.

How does power management operate in the IDT79RV4700-200GH?

Power management in the IDT79RV4700-200GH is implemented via a standby mode entered by executing the WAIT instruction when the SysAD bus is idle. In this mode, internal clocks shut down to freeze the pipeline while retaining operation of PLL, timers, and interrupt inputs. Exit occurs on any interrupt, including the internal timer. This feature reduces average power consumption in intermittently active embedded applications such as printer controllers and industrial gateways.