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Renesas IDT79R3041-25PFG
- Part No.:
- IDT79R3041-25PFG
- Manufacturer:
- Renesas
- Category:
- Microprocessors
- Package:
- 100-LQFP
- Datasheet:
-
IDT79R3041-25PFG.pdf
- Description:
- IC MPU 25MHZ 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,832
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Product details
Overview
IDT79R3041-25PFG from Integrated Device Technology, Inc. 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 25 MHz, delivers 20 MIPS, and targets cost-sensitive embedded systems such as laser printer controllers and low-end networking appliances.
For engineers reviewing the IDT79R3041-25PFG datasheet, IDT79R3041-25PFG pinout, IDT79R3041-25PFG application, or IDT79R3041-25PFG equivalent, key selection criteria include its 84-pin PLCC package, 8-/16-/32-bit programmable port width support, double-frequency clock input (ClkIn), SysClk output for synchronous bus timing, and software compatibility with the IDT79R3000A and broader RISController family.
Technical Context
The IDT79R3041-25PFG implements the MIPS-I ISA with a five-stage pipeline, 32×32-bit general-purpose register file, and integer ALU with dedicated multiply/divide unit. Its execution engine is binary-compatible with the IDT79R3000A, enabling reuse of existing toolchains and firmware.
System control is managed by an on-chip CP0 co-processor supporting cache configuration, bus timing control, port size register programming, and 24-bit count/compare timer functions - all accessible via privileged kernel software without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Clock Frequency | 25 MHz operation with 2× frequency input (ClkIn = 50 MHz); enables deterministic timing for low-cost memory interfaces. |
| Instruction Cache | 2 kB direct-mapped physical-address cache; eliminates external instruction SRAM and improves code fetch efficiency from slow PROMs. |
| Data Cache | 512 B write-through direct-mapped cache; ensures memory coherency while reducing stalls via 4-deep write buffer. |
| Bus Interface | 32-bit multiplexed address/data bus with ALE, Rd/Wr, DataEn, and programmable port width (8/16/32-bit sub-regions); supports mixed-width memory systems without glue logic. |
| Timer | On-chip 24-bit programmable timer (Count/Compare registers); usable for DRAM refresh or real-time task scheduling in bare-metal or RTOS environments. |
| Package | 84-pin PLCC (cavity-down); RoHS-compliant, socket-compatible, optimized for thermal dissipation in commercial temperature range (0°C to +85°C). |
| Power Supply | Single 5 V supply (VCC/VSS pins distributed across package); simplifies power delivery vs. multi-rail processors. |
Pinout & Package
Package: 84-pin Plastic Leaded Chip Carrier (PLCC), cavity-down, commercial temperature grade (0°C to +85°C). Pin layout conforms to IDT's standard RISController footprint and is pin-compatible with IDT79R3000A-based designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A/D(31:0) | Time-multiplexed Address/Data Bus | Carries 32-bit address during ALE phase, then bidirectional data; supports burst reads and byte-aligned writes via BE(3:0) strobes. |
| ClkIn | Input Clock | Accepts 50 MHz differential or single-ended square wave (40–60% duty cycle); internally divided to generate core and bus clocks. |
| SysClk | Output Clock | Phase-synchronized 25 MHz reference for external logic; minimizes setup/hold violations in latch-based memory interfaces. |
| ALE | Address Latch Enable | Strobes high during address phase; used to capture A/D(31:4) into external latches; supports extended hold time via CP0 register. |
| Rd / Wr | Read/Write Control | Active-low signals indicating bus transaction direction; programmable polarity and timing via CP0 bus control register. |
| BusReq / BusGnt | DMA Arbitration | Enables external masters (e.g., video controller) to seize bus control; integrated DMA arbiter handles priority and handshaking. |
| Int(5:3), SInt(2:0) | Interrupt Inputs | Seven-level vectored interrupt system (five maskable Int, three software-triggered SInt); supports nested exception handling per MIPS ISA. |
| TC | Timer Compare Output | Active-high pulse generated on 24-bit timer overflow; directly drives interrupt or external event logic without GPIO overhead. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Port Width | Kernel-configurable 8-/16-/32-bit memory sub-regions enable boot from narrow PROMs and execution from wide DRAM - no external data packing logic required. |
| 4-Deep Write Buffer | Decouples CPU store rate from memory write latency; prevents execution stalls during writes to slow EPROM or DRAM, sustaining 20 MIPS throughput. |
| 4-Deep Read Buffer | Queues burst-read data from page-mode DRAM before cache fill; allows quad-word reads even with modest memory bandwidth. |
| Big/Little Endian Runtime Switch | Configurable via CP0 status register; enables interoperability with legacy peripherals and cross-platform firmware porting without hardware redesign. |
| Extended Address Hold Mode | Adds 0.5-cycle hold time after ALE falling edge; permits use of low-cost FPGAs, ASICs, and TTL latches without timing margin violations. |
Applications
| Laser Printer Controller | Network Appliance Baseband Processor |
|---|---|
|
Use Scenario: Controls raster image processing, font rendering, and engine timing in mid-volume laser printers using PostScript or PCL interpreters. IC Role / Device Role / Timing Role: Primary RISC CPU executing interpreter firmware, managing DRAM frame buffers, and driving parallel I/O for laser engine and paper feed subsystems. Use Value: 2 kB instruction cache enables fast PDL bytecode fetch from 8-bit boot PROM; programmable port width supports 16-bit font cartridges and 32-bit main memory in same design. |
Use Scenario: Hosts lightweight TCP/IP stack and packet filtering logic in residential DSL/cable gateways with limited BOM cost targets. IC Role / Device Role / Timing Role: System-on-chip controller handling Ethernet MAC interface, flash-based configuration storage, and serial management console. Use Value: On-chip 24-bit timer provides precise packet timestamping and watchdog timeout; 512 B data cache reduces SRAM dependency for small packet buffers. |
| Industrial HMI Terminal | Legacy Protocol Gateway |
|
Use Scenario: Drives monochrome LCD panels and keypad interfaces in factory-floor HMIs requiring deterministic response to operator inputs. IC Role / Device Role / Timing Role: Real-time controller executing state-machine logic, scanning I/O ports, and updating display memory via DMA-controlled framebuffer writes. Use Value: SysClk output synchronizes display controller timing; 4-deep write buffer ensures glitch-free screen updates during concurrent serial comms and button polling. |
Use Scenario: Bridges Modbus RTU over RS-485 to Ethernet TCP in building automation systems, translating legacy fieldbus commands. IC Role / Device Role / Timing Role: Protocol translation engine running dual UART drivers and socket-based network stack with minimal external memory. Use Value: Software-emulated floating point supports scaling calculations for sensor data; pin/software compatibility allows drop-in replacement of aging R3000A-based gateways. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RISC microprocessor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IDT79R3051-25PFG | 4 kB instruction cache, 2 kB data cache, optional MMU with 64-entry TLB; same 84-pin PLCC package and 25 MHz speed grade. | Required for virtual memory OSes (e.g., VxWorks, pSOS); supports larger firmware images and multitasking with memory protection. | Select when migrating from IDT79R3041-25PFG to enable protected-mode RTOS or expand code footprint beyond 2 kB cache limits. |
| IDT79R3081-25PFG | Includes on-chip hardware floating-point unit (FPU); 8 kB/8 kB cache; same pinout but higher power consumption and thermal profile. | Necessary for real-time signal processing (e.g., audio codec, motor control) where software FP emulation in IDT79R3041-25PFG incurs unacceptable latency. | Choose only if application requires sustained >1 MFLOPS performance; verify PCB thermal design accommodates higher junction temperature. |
Compared with IDT79R3041-25PFG, IDT79R3051-25PFG adds memory management for scalable OS deployment, while IDT79R3081-25PFG trades cache size for hardware floating-point acceleration - both retain identical pinout and software ABI, enabling incremental upgrades without board respin.
Availability
IDT79R3041-25PFG is available at Aetrix Electronics and suitable for laser printer controllers, network appliance baseband processing, industrial HMI terminals, and legacy protocol gateways requiring stable component supply across long-lifecycle embedded programs.
Supply support for IDT79R3041-25PFG 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 U.S.-based 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 IDT79R3041-25PFG - was designed to deliver MIPS RISC performance in cost-constrained embedded systems, emphasizing integration (cache, DMA, timer) and flexible memory interfacing over raw clock speed.
FAQ
What is the maximum operating frequency of the IDT79R3041-25PFG?
The IDT79R3041-25PFG is rated for 25 MHz core operation, achieved with a 50 MHz double-frequency ClkIn input. Its internal clock generator divides this input to produce synchronized SysClk (25 MHz), CPU, and bus timing signals. Operation above 25 MHz is not guaranteed and violates the commercial temperature specification.
Does the IDT79R3041-25PFG include a memory management unit (MMU)?
No, the IDT79R3041-25PFG does not include an MMU or TLB. It implements the base RISController architecture with fixed virtual-to-physical address mapping (kseg0/kseg1/kuseg), supporting kernel/user mode separation via physical address decoding only. For MMU functionality, consider the pin-compatible IDT79R3051-25PFG.
Can the IDT79R3041-25PFG boot from an 8-bit PROM?
Yes, the IDT79R3041-25PFG supports booting from 8-bit, 16-bit, or 32-bit PROMs via its programmable port width feature. The Port Size Control Register in CP0 allows kernel software to configure memory sub-regions independently, enabling transparent access to narrow boot devices without external data alignment logic.
What is the function of the SysClk pin on the IDT79R3041-25PFG?
The SysClk pin outputs a clean, phase-locked 25 MHz clock derived from ClkIn, intended as a timing reference for external logic such as address latches, DRAM controllers, or peripheral interfaces. Its low-skew, high-drive capability minimizes setup/hold timing violations in synchronous bus designs - critical for reliable operation with slow memory components.
Is the IDT79R3041-25PFG pin-compatible with the IDT79R3000A?
Yes, the IDT79R3041-25PFG is superset pin-compatible with the IDT79R3000A and other RISController family members in the 84-pin PLCC package. It retains identical pin assignments for core signals (A/D, ClkIn, Rd/Wr, ALE, Int) while adding new functions (e.g., Burst/WrNear, SBrCond) on previously NC pins - enabling drop-in replacement in many R3000A-based designs.
IDT79R3041-25PFG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- 100-LQFP
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Obsolete
- Core Processor:
- MIPS-I
- Number of Cores/Bus Width:
- 1 Core, 32-Bit
- Speed:
- 25MHz
- Co-Processors/DSP:
- System Control; CP0
- RAM Controllers:
- DRAM
- Graphics Acceleration:
- No
- Display & Interface Controllers:
- -
- Ethernet:
- -
- SATA:
- -
- USB:
- -
- Voltage - I/O:
- 5.0V
- Operating Temperature:
- 0°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Security Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x14)
- Additional Interfaces:
- -
IDT79R3041-25PFG FAQ
1.How can I place an order for IDT79R3041-25PFG through Aetrix?
Please submit a Request for Quotation (RFQ) for IDT79R3041-25PFG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for IDT79R3041-25PFG reliable?
The price and inventory of IDT79R3041-25PFG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for IDT79R3041-25PFG is usually 5 days.
3.What payment methods are accepted for IDT79R3041-25PFG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for IDT79R3041-25PFG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for IDT79R3041-25PFG?
IDT79R3041-25PFG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your IDT79R3041-25PFG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for IDT79R3041-25PFG?
For technical support, including IDT79R3041-25PFG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your IDT79R3041-25PFG requirements.
6.How does Aetrix verify that IDT79R3041-25PFG is sourced from the original manufacturer or authorized distributors?
All IDT79R3041-25PFG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that IDT79R3041-25PFG meets industry standards.
7.What is the process for return or replacement of IDT79R3041-25PFG?
All IDT79R3041-25PFG units undergo pre-shipment inspection (PSI). If there is an issue with IDT79R3041-25PFG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The IDT79R3041-25PFG part is unused and in its original packaging.
Return procedure for IDT79R3041-25PFG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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