NXP Semiconductors MC68EC030FE40C

Overview

MC68EC030FE40C from Motorola is a second-generation 32-bit embedded controller derived from the MC68030, optimized for cost-sensitive systems using DRAM. It features 256-byte on-chip instruction and data caches, burst-mode bus interface for DRAM, dynamic bus sizing (8/16/32-bit), and operates at 40 MHz delivering up to 9.2 MIPS in embedded control applications such as industrial motion controllers and telecom line cards.

For engineers reviewing the MC68EC030FE40C datasheet, MC68EC030FE40C pinout, MC68EC030FE40C application, or MC68EC030FE40C equivalent, key selection criteria include cache-enabled performance with low-cost memory subsystems, nonmultiplexed 32-bit address/data buses, M68000-family object-code compatibility, and support for asynchronous/synchronous/burst bus cycles - all critical for legacy-compatible real-time embedded designs.

Technical Context

The MC68EC030FE40C implements a pipelined architecture with parallel internal cache accesses and bus transfers, enabling overlapped instruction execution. Its bus controller supports three transfer modes: asynchronous (min. 3-clock cycles), synchronous (min. 2-clock cycles), and burst (DRAM page-mode compatible), with dynamic bus sizing negotiated per cycle via DSACKx signals.

It retains the full M68000 programming model - 16×32-bit general-purpose registers, supervisor/user stack pointers, vector base register (VBR), and status register with trace bits (T0/T1) - while omitting the MMU present in the MC68030. Cache coherency is managed via CACR/CAAR registers and ACU-defined memory segments (16 MB–2 GB) with programmable cacheability.

Key Specifications

Pinout & Package

MC68EC030FE40C uses a 132-pin Plastic Pin Grid Array (PPGA) package designed for through-hole mounting. This package supports full 32-bit nonmultiplexed address and data buses, dedicated function code (FC0–FC2), cache control (CDIS), burst request (CBREQ), and synchronous termination (STERM) signals required for its advanced bus operation modes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MC68EC030FE40C, the MC68332CFN16 trades cache performance for I/O determinism and smaller footprint, while the MC68360EM33C adds protocol acceleration at the cost of external cache dependency - making MC68EC030FE40C optimal for DRAM-based embedded systems needing balanced compute, memory efficiency, and M68000 software continuity.

Availability

MC68EC030FE40C is available at Aetrix Electronics and suitable for industrial motion controllers, telecom line cards, avionics display processors, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for MC68EC030FE40C 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 automotive markets, emphasizing architectural continuity and real-time determinism.

The MC68EC030FE40C belongs to Motorola's enhanced embedded controller product line, designed specifically to deliver MC68030-class performance using cost-effective DRAM subsystems while maintaining full M68000 software compatibility for legacy system upgrades.

FAQ

What is the maximum operating frequency of the MC68EC030FE40C?

The MC68EC030FE40C is rated for a maximum operating frequency of 40 MHz, delivering up to 9.2 million instructions per second (MIPS). This rating is validated under specified voltage (5.0 V ±5%) and temperature (0°C to +70°C) conditions, and it enables efficient burst-mode DRAM access and sustained cache hit ratios in embedded control applications.

Does the MC68EC030FE40C include a memory management unit (MMU)?

No, the MC68EC030FE40C does not include an MMU. Unlike the MC68030, it omits MMU instructions (e.g., PFLUSH, PMOVE) and related hardware. Memory protection is instead implemented via the Access Control Unit (ACU), which defines two cacheable/non-cacheable memory segments using AC0/AC1 registers - sufficient for many real-time embedded applications without virtual memory requirements.

How does dynamic bus sizing work on the MC68EC030FE40C?

Dynamic bus sizing on the MC68EC030FE40C uses DSACK0–DSACK2 inputs to detect peripheral port width (8/16/32-bit) on a cycle-by-cycle basis. When accessing a misaligned or narrow device, the controller automatically issues multiple bus cycles - e.g., four 8-bit reads for a long-word - without software intervention. This allows unified firmware to interface with mixed-width peripherals while preserving timing predictability.

What cache architecture does the MC68EC030FE40C implement?

The MC68EC030FE40C implements two independent 256-byte direct-mapped caches: one for instructions and one for data. Each cache contains 16 lines of four long words (64 total entries), with tag fields including upper address bits and function code (for data cache). Cache control is managed via CACR (enable/disable/clear) and CAAR (address-targeted operations), supporting write-through policy with programmable write allocation.

Is the MC68EC030FE40C pin-compatible with the MC68030?

No, the MC68EC030FE40C is not pin-compatible with the MC68030. While both share the same 32-bit nonmultiplexed bus architecture and functional signal definitions, the MC68EC030FE40C uses a 132-pin PPGA package optimized for through-hole mounting and cost-sensitive layouts, whereas the MC68030 uses a 132-pin PGA variant with different pin assignments for cache tags, MMU signals, and bus arbitration - requiring PCB redesign for substitution.