Renesas IDT79R3041-33PF

Overview

IDT79R3041-33PF from Integrated Device Technology is a 32-bit MIPS RISC microprocessor with integrated instruction cache (2 kB), data cache (512 B), programmable bus interface, on-chip DMA arbiter, and 24-bit timer. It operates at 33 MHz, delivers 20 MIPS at 25 MHz, and supports 8-/16-/32-bit memory port widths. Designed for cost-sensitive embedded systems such as laser printer controllers and PDL interpreters.

For engineers reviewing the IDT79R3041-33PF datasheet, IDT79R3041-33PF pinout, IDT79R3041-33PF application, or IDT79R3041-33PF equivalent, key selection criteria include its PLCC-84 package, double-frequency clock input (ClkIn), SysClk output timing feedback, and software compatibility with the IDT79R3000A and broader RISController family.

Technical Context

The IDT79R3041-33PF implements the MIPS-I ISA with a five-stage pipeline and 32 orthogonal 32-bit general-purpose registers. Its CPU core is binary-compatible with the IDT79R3000A, enabling direct software reuse without recompilation.

It integrates a System Control Coprocessor (CP0) managing exception handling, virtual-to-physical address mapping (base architecture, no TLB), cache configuration, bus timing control, and programmable port width per physical address sub-region - all configurable via CP0 registers at reset or runtime.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), cavity-down, commercial temperature range (0°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT79R3041-33PF, IDT79R3051-33PF adds MMU support for secure multitasking but increases software complexity, while IDT79R3081-33PF delivers hardware FP acceleration at the cost of higher power and thermal management requirements - neither replaces IDT79R3041-33PF in cost-optimized, cache-driven embedded control roles.

Availability

IDT79R3041-33PF is available at Aetrix Electronics and suitable for laser printer controllers, PostScript interpreter systems, field-upgradeable embedded platforms, low-cost industrial HMIs, and PDL-based document processing requiring stable component supply over extended production lifecycles.

Supply support for IDT79R3041-33PF 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, and embedded processor solutions before its acquisition by Renesas Electronics in 2019.

The RISController family - including IDT79R3041-33PF - was designed to deliver MIPS RISC performance in cost-sensitive embedded applications like laser printing, PDL interpretation, and industrial control, emphasizing integration, power efficiency, and mixed-width memory interfacing.

FAQ

What is the maximum operating frequency of the IDT79R3041-33PF?

The IDT79R3041-33PF is rated for 33 MHz operation, with its double-frequency ClkIn input requiring a 66 MHz signal. It achieves 20 MIPS performance at 25 MHz when executing from its on-chip instruction cache. The "33" in the part number explicitly denotes this 33 MHz maximum rating under commercial temperature conditions (0°C to +85°C).

Does the IDT79R3041-33PF include a memory management unit (MMU)?

No, the IDT79R3041-33PF does not include an MMU or TLB. It implements the base RISController architecture with fixed virtual-to-physical address mapping (kseg0/kseg1/kuseg segmentation) and relies on external address decoding for memory protection. This simplifies software and reduces cost compared to MMU-equipped variants like the IDT79R3051-33PF.

How does the IDT79R3041-33PF support mixed-width memory systems?

The IDT79R3041-33PF supports 8-, 16-, and 32-bit memory port widths via its Port Size Control Register in CP0. Kernel software can assign different widths to distinct physical address sub-regions, enabling simultaneous use of an 8-bit boot PROM, 16-bit font cartridge, and 32-bit main DRAM - all with transparent on-chip data packing/unpacking and no external logic.

What is the function of the SysClk pin on the IDT79R3041-33PF?

The SysClk pin on the IDT79R3041-33PF outputs a feedback-referenced system clock derived from ClkIn. It is used by external logic (e.g., address latches, transceivers) to meet precise setup/hold timing relative to the CPU's internal bus interface - reducing skew and enabling reliable interfacing with low-cost components without complex PCB layout constraints.

Can the IDT79R3041-33PF execute code directly from external ROM without caching?

Yes, the IDT79R3041-33PF can execute code directly from external ROM using uncached accesses. Its instruction cache is optional and can be disabled via CP0 configuration. However, performance drops significantly without caching - the 2 kB instruction cache is essential to achieving 20 MIPS at 25 MHz, especially when sourcing from low-speed EPROM or flash devices.