Renesas IDT79R4700-100DP

Overview

IDT79R4700-100DP from Integrated Device Technology is a 64-bit RISC microprocessor implementing the MIPS-III ISA, operating at 100 MHz with 5V supply, featuring 16KB instruction and 16KB data caches, 64GB physical address space, and full software/pin compatibility with the R4XXX family. It serves as a high-integration CPU core in embedded networking and printing systems requiring deterministic real-time memory management.

For engineers reviewing the IDT79R4700-100DP datasheet, IDT79R4700-100DP pinout, IDT79R4700-100DP application, or IDT79R4700-100DP equivalent, key selection criteria include its 5V operation, 179-pin PGA package, JTAG debug interface, TLB-locking capability for real-time systems, and non-overlapping system bus timing compliance.

Technical Context

The IDT79R4700-100DP employs a simple 5-stage integer pipeline with fully bypassed register file and autonomous multiply/divide unit, enabling single-cycle ALU operations and transparent resource dependencies across MIPS-III implementations. Its floating-point co-processor supports IEEE 754 single/double precision with pipelined multiply (4-cycle initiation) and precise exception handling.

Virtual-to-physical address translation uses a joint TLB (96 entries), dual 2-entry ITLB and 4-entry DTLB, plus configurable page sizes (4KB–16MB) and lockable TLB entries for deterministic access. Cache coherency is managed per-page via attribute bits supporting uncached, write-through, and write-back policies-non-coherent write-back is default for code/data.

Key Specifications

Pinout & Package

Package: 179-pin Pin Grid Array (PGA), cavity-down construction optimized for thermal dissipation in embedded chassis environments; case temperature rated 0°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT79R4700-100DP, the -150DP offers +50% clock headroom within identical thermal and layout constraints, while the -200DP delivers full architectural performance but demands stricter board-level validation for setup/hold timing and power delivery stability.

Availability

IDT79R4700-100DP is available at Aetrix Electronics and suitable for LAN switches, enterprise routers, color laser printers, and industrial protocol gateways requiring stable component supply across extended production lifecycles.

Supply support for IDT79R4700-100DP 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 IDT79R4700-100DP belongs to IDT's RC4700 processor family, designed specifically for cost-sensitive, thermally constrained embedded networking and imaging applications requiring MIPS-III compatibility and deterministic memory management.

FAQ

What is the operating voltage requirement for the IDT79R4700-100DP?

The IDT79R4700-100DP is a 5V-only part, designated as an "R" variant per IDT documentation. It is not compatible with 3.3V operation - the "RV" suffix denotes the reduced-voltage version. Power supply must be regulated to ±5% over temperature, with adequate decoupling per the hardware user's manual. The IDT79R4700-100DP does not support mixed-voltage I/O or dynamic voltage scaling.

Does the IDT79R4700-100DP support little-endian or big-endian operation?

The IDT79R4700-100DP supports both endianness modes, selected at boot time via mode bit 8: '0' configures little-endian, '1' configures big-endian. This setting is latched during the 256-bit serial boot stream and remains fixed until reset. The IDT79R4700-100DP does not support runtime endianness switching; firmware must be compiled for the chosen mode prior to deployment.

What package type is used for the IDT79R4700-100DP?

The IDT79R4700-100DP is packaged in a 179-pin Pin Grid Array (PGA) with cavity-down construction, optimized for thermal dissipation in enclosed embedded systems. This matches the "DP" suffix in the part number, confirming the PGA variant - distinct from the 208-pin QFP option denoted by "DQ". The IDT79R4700-100DP requires standard PGA socket or reflow-compatible mounting per IDT mechanical drawings.

Can the IDT79R4700-100DP execute floating-point operations natively?

Yes, the IDT79R4700-100DP integrates a full IEEE 754-compliant floating-point co-processor supporting single- and double-precision add, subtract, multiply, divide, square root, and format conversions. All FP instructions execute in parallel with integer operations, with latencies documented in the hardware manual (e.g., 4-cycle ADD, 61-cycle DIV). The IDT79R4700-100DP does not require external math coprocessors for standard FP workloads.

Is JTAG boundary scan supported on the IDT79R4700-100DP?

No, the IDT79R4700-100DP implements JTAG pins solely for test clock and data routing, with serial input tied to serial output as stated in the datasheet. Boundary scan functionality is explicitly disabled - the device lacks scan chain logic, TAP controller state machine, or BSDL model. Debugging relies on standard MIPS EJTAG protocol via dedicated debug port pins, not IEEE 1149.1 boundary scan.