Renesas 79RC32K438-200BB

Overview

79RC32K438-200BB from Integrated Device Technology is a 32-bit MIPS32-compatible communications processor with integrated DDR memory controller, dual 10/100 Ethernet MACs, PCI 2.2 interface, two 16550 UARTs, I²C, SPI, and 32 GPIO pins. It operates at 200 MHz, supports up to 2 GB DDR SDRAM, and targets embedded networking and communications control applications.

For engineers reviewing the 79RC32K438-200BB datasheet, 79RC32K438-200BB pinout, 79RC32K438-200BB application, or 79RC32K438-200BB equivalent, key selection criteria include its 200 MHz CPU clock, DDR bus width (x32), PCI host/satellite mode flexibility, dual MII interfaces, and EJTAG 2.6 debug support.

Technical Context

The 79RC32K438-200BB implements the MIPS Technologies 4Kc CPU core with 16 KB instruction and 16 KB data caches, 4-way set associative, line locking, and non-blocking prefetches. It includes a full MMU with 16-entry JTLB and separate 3-entry instruction/data TLBs.

Its DDR controller supports x16/x32 configurations, two chip selects, automatic refresh, and differential DDRCKP/DDRCKN clocks. The memory/peripheral bus provides 26-bit address/16-bit data, six chip selects, programmable wait states (0–63), and Intel/Motorola peripheral protocol support.

Key Specifications

Pinout & Package

79RC32K438-200BB is housed in a 324-pin PBGA package (27 mm × 27 mm, 1.27 mm pitch) with thermal pad. Pin functions are multiplexed across system clock, DDR, PCI, MII, UART, I²C, SPI, and GPIO domains.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar communications processor applications.

Compared with 79RC32K438-200BB, the 79RC32438-200BB offers identical functionality and timing, while the MPC8247VRMIB trades DDR integration for higher CPU speed and PowerPC compatibility-making it suitable only where external memory and architecture migration are acceptable.

Availability

79RC32K438-200BB is available at Aetrix Electronics and suitable for network router control planes, industrial protocol gateways, VoIP media gateways, and secure remote access appliances requiring stable component supply and long-term lifecycle support.

Supply support for 79RC32K438-200BB 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 timing, memory interface, RF, and communications ICs before its acquisition by Renesas Electronics in 2019.

The 79RC32K438-200BB belongs to IDT's Interprise™ family of integrated communications processors, designed specifically for cost-sensitive, power-efficient embedded networking applications requiring CPU, memory, and I/O integration in a single package.

FAQ

What is the maximum DDR SDRAM capacity supported by the 79RC32K438-200BB?

The 79RC32K438-200BB supports up to 2 GB of DDR SDRAM using its integrated DDR memory controller. This is achieved via two chip selects, each supporting up to 1 GB across 4 internal banks, with configurable x16 or x32 data bus widths and support for 64 Mb through 1 Gb discrete DDR devices.

Does the 79RC32K438-200BB include an on-chip memory subsystem beyond cache?

Yes, the 79RC32K438-200BB includes 4 KB of on-chip SRAM organized as 1K × 32 bits. This SRAM supports burst and non-burst accesses by the CPU, PCI, and DMA engines for low-latency storage of boot code, interrupt vectors, or real-time buffers - complementing the 16 KB instruction and 16 KB data caches.

Can the 79RC32K438-200BB operate in both PCI host and satellite modes simultaneously?

No, the 79RC32K438-200BB operates in either PCI host mode (with internal arbiter) or satellite mode (as a PCI target), configured at boot time via strap pins or configuration registers. It cannot function as both host and satellite concurrently; mode selection determines whether PCIREQN/PCIGNTN signals act as inputs or outputs.

How many independent DMA channels does the 79RC32K438-200BB provide, and what are their assignments?

The 79RC32K438-200BB provides 10 independent descriptor-based DMA channels: two for PCI (PCI↔memory), two per Ethernet interface (four total), two for memory-to-memory transfers, and two for external peripheral operations - all supporting unaligned byte-length transfers and scatter/gather addressing.

Is the 79RC32K438-200BB compatible with the EJTAG 2.6 specification for in-circuit debugging?

Yes, the 79RC32K438-200BB implements a fully compliant EJTAG Rev 2.6 interface with hardware breakpoints on virtual addresses, software breakpoints, start/stop/single-step CPU control, and ICE connectivity - enabling full visibility into register state, memory, and execution flow during firmware development and validation of the 79RC32K438-200BB.