NXP Semiconductors MC68EC030FE25CB1

Overview

MC68EC030FE25CB1 from Motorola is a second-generation 32-bit embedded controller derived from the MC68030, optimized for cost-sensitive systems using DRAM-based memory subsystems. It features 256-byte on-chip instruction and data caches, burst-mode bus interface, dynamic bus sizing for 8-/16-/32-bit peripherals, and operates at 25 MHz with up to 9.2 MIPS performance. It targets industrial control, communications equipment, and embedded instrumentation requiring object-code compatibility with M68000-family software.

For engineers reviewing the MC68EC030FE25CB1 datasheet, MC68EC030FE25CB1 pinout, MC68EC030FE25CB1 application, or MC68EC030FE25CB1 equivalent, key selection criteria include its nonmultiplexed 32-bit address/data buses, supervisor/user privilege separation, cache control register (CACR) programmability, and absence of an integrated MMU-distinguishing it from the full MC68030.

Technical Context

The MC68EC030FE25CB1 implements a pipelined execution unit with parallel internal cache accesses and bus transfers, enabling overlapped instruction execution and burst prefetching. Its microarchitecture includes a two-level microcode store (microROM/nanoROM), PLAs for instruction decode, and autonomous instruction/data cache blocks each organized as 64 long-word entries (256 bytes) with 4-long-word line size.

It supports three bus transfer modes: asynchronous (min. 3 clocks, DSACKx-terminated), synchronous (min. 2 clocks, STERM-terminated), and burst (cache-fill only, CBREQ-initiated). Dynamic bus sizing adapts data width per cycle via DSACKx signals, while function code pins (FC0–FC2) distinguish supervisor/user, program/data, and CPU address spaces for hardware memory management.

Key Specifications

Pinout & Package

MC68EC030FE25CB1 is housed in a 132-pin Plastic Pin Grid Array (PPGA) package designed for through-hole mounting. The package supports thermal dissipation requirements of embedded controllers operating at 25 MHz in industrial temperature ranges.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 32-bit embedded controller applications.

Compared with MC68EC030FE25CB1, the MC68332CFN16 trades cache performance for integrated real-time peripherals, while the MC68EC040RC25B adds MMU and larger caches at the cost of higher complexity and power-making MC68EC030FE25CB1 optimal for cost-constrained, cache-accelerated embedded control where MMU is unnecessary.

Availability

MC68EC030FE25CB1 is available at Aetrix Electronics and suitable for industrial motion control, telecom line card processing, medical imaging subsystems, and avionics data acquisition requiring stable component supply across extended product lifecycles.

Supply support for MC68EC030FE25CB1 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

Motorola Semiconductor (now part of NXP Semiconductors) pioneered the M68000 family and delivered high-reliability microcontrollers for industrial and automotive markets.

The MC68EC030 belongs to Motorola's enhanced embedded controller product line, designed specifically to deliver MC68030-class performance in cost-sensitive, DRAM-based systems without requiring an MMU or floating-point unit.

FAQ

What is the maximum operating frequency of the MC68EC030FE25CB1?

The MC68EC030FE25CB1 is rated for a maximum clock frequency of 25 MHz, delivering up to 9.2 million instructions per second (MIPS) under typical embedded workload conditions. This speed is guaranteed across the industrial temperature range and aligns with the "FE25" suffix in the part number, which explicitly denotes the 25 MHz speed grade.

Does the MC68EC030FE25CB1 include a memory management unit (MMU)?

No, the MC68EC030FE25CB1 does not include an MMU. Unlike the full MC68030, it omits the MMU to reduce die size, cost, and power consumption-making it suitable for real-time embedded applications that use flat memory models or external memory controllers. Memory protection is instead implemented via the Access Control Unit (ACU) and function code pins.

How does the MC68EC030FE25CB1 handle mixed-width peripheral interfaces?

The MC68EC030FE25CB1 uses dynamic bus sizing via DSACK0–DSACK2 signals to automatically adapt each bus cycle to 8-, 16-, or 32-bit peripheral widths. This eliminates software overhead for width-specific access routines and allows a single codebase to interface seamlessly with heterogeneous peripherals-such as 8-bit sensors, 16-bit DACs, and 32-bit memory chips-without external bus transceivers.

What cache coherency mechanisms are supported by the MC68EC030FE25CB1?

The MC68EC030FE25CB1 implements write-through data caching with optional write allocation controlled by the CACR register. This ensures external memory and peripherals always reflect the latest data, avoiding coherency issues during DMA or memory-mapped I/O operations. Instruction cache coherency is maintained by software-initiated flushes via the CACR, as no hardware snooping is provided.

Is the MC68EC030FE25CB1 pin-compatible with the MC68030?

No, the MC68EC030FE25CB1 is not pin-compatible with the MC68030. Although functionally similar and object-code compatible, it uses a 132-pin PPGA package (CB1 suffix) versus the MC68030's 132-pin PGA or 160-pin QFP variants, with differing pin assignments for cache control, bus timing, and function code signals-requiring PCB layout changes for direct replacement.