NXP Semiconductors MC68EC030CFE25C

Overview

MC68EC030CFE25C from Motorola is a second-generation 32-bit embedded controller optimized for cost-effective DRAM-based systems, featuring 256-byte on-chip instruction cache, 256-byte on-chip data cache, and burst-mode bus interface supporting up to 9.2 MIPS at 25 MHz. It maintains object-code compatibility with MC68020/MC68030 and targets industrial control, communications equipment, and legacy embedded systems requiring deterministic real-time execution.

For engineers reviewing the MC68EC030CFE25C datasheet, MC68EC030CFE25C pinout, MC68EC030CFE25C application, or MC68EC030CFE25C equivalent, key selection criteria include its nonmultiplexed 32-bit address/data bus, dynamic bus sizing for 8/16/32-bit peripherals, pipelined architecture with parallel cache/bus access, and absence of integrated MMU-making it distinct from full-featured MC68030 in memory management capability.

Technical Context

The MC68EC030CFE25C implements a pipelined micromachine architecture with independent instruction and data caches, enabling overlapped instruction execution and concurrent internal cache accesses with external bus transfers. Its bus controller supports asynchronous (min. 3-clock), synchronous (min. 2-clock), and burst read cycles-each dynamically sized per cycle via DSACKx signals.

Cache operation uses direct-mapped 64-entry organization (4 long-words/line), with write-through data cache policy and programmable write allocation controlled by CACR. Address space segmentation is enforced via two supervisor-only access control registers defining 16 MB–2 GB memory segments with cacheability and function-code attributes.

Key Specifications

Pinout & Package

MC68EC030CFE25C is housed in a 132-pin Plastic Pin Grid Array (PPGA) package designed for through-hole mounting. The package supports full 32-bit address and data buses alongside dedicated control, status, and coprocessor interface signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68EC030CFE25C, the 40 MHz variant delivers higher throughput without architectural change, while the MC68332 offers superior real-time I/O control at lower clock speed but requires complete firmware rewrite due to incompatible instruction set and absence of caches.

Availability

MC68EC030CFE25C is available at Aetrix Electronics and suitable for industrial motion control, legacy telecom equipment, avionics data acquisition, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for MC68EC030CFE25C 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 (later Freescale, now NXP) pioneered high-performance embedded microcontrollers for industrial and communications markets using advanced HCMOS process technology.

The MC68EC030 product line was designed to deliver MC68030-class performance in cost-sensitive embedded systems by removing the MMU while retaining caches, pipelining, and full M68000-family software compatibility.

FAQ

What is the maximum operating frequency of the MC68EC030CFE25C?

The MC68EC030CFE25C is rated for a maximum clock frequency of 25 MHz, delivering up to 9.2 million instructions per second (MIPS) under typical operating conditions. This rating is validated across commercial temperature range (0°C to +70°C) and specified in Motorola's official MC68EC030 technical data sheet Rev. 1. Exceeding 25 MHz may result in timing violations or undefined behavior, as the device's internal pipeline, cache, and bus controller are characterized only at this speed.

Does the MC68EC030CFE25C include a memory management unit (MMU)?

No, the MC68EC030CFE25C does not include a memory management unit. Unlike the MC68030, it omits the MMU to reduce die size and cost while retaining the integer execution unit, dual 256-byte caches, and enhanced bus controller. Memory protection and virtual addressing must be implemented externally or omitted entirely-this makes MC68EC030CFE25C suitable for real-time embedded applications where deterministic timing outweighs OS-level memory isolation requirements.

How does dynamic bus sizing work on the MC68EC030CFE25C?

Dynamic bus sizing on the MC68EC030CFE25C operates per bus cycle using DSACK0 and DSACK1 inputs to detect peripheral port width (8-, 16-, or 32-bit). When a long-word access is issued, the controller reads the DSACK signals early in the cycle and automatically adjusts data strobes and transfer count-requiring one, two, or four cycles respectively. This eliminates software polling or width-specific coding, allowing MC68EC030CFE25C to interface seamlessly with mixed-width peripherals without glue logic or driver layer abstraction.

Can the on-chip caches of the MC68EC030CFE25C be disabled or controlled in software?

Yes, the instruction and data caches of the MC68EC030CFE25C are fully controllable via the Cache Control Register (CACR) in supervisor mode. Software can enable/disable either cache independently, clear entire caches, or invalidate individual cache lines using the CAAR register. Additionally, the CDIS pin provides hardware-level cache disable override. Cache behavior-including write allocation policy-is programmable, and all cache control operations are documented in the MC68EC030 programming model section of the technical data sheet.

Is the MC68EC030CFE25C pin-compatible with the MC68030?

No, the MC68EC030CFE25C is not pin-compatible with the MC68030. Although both share identical bus signaling protocols and functional pin definitions, the MC68EC030CFE25C uses a 132-pin PPGA package whereas the MC68030 uses a 132-pin PGA with different mechanical dimensions and pin pitch. Furthermore, the MC68EC030CFE25C lacks MMU-related pins (e.g., MA0–MA7, AT, AS, etc.) present on the MC68030, resulting in incompatible pinout mapping despite functional similarity in non-MMU features.