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构成系统的微处理器变得越来越复杂了,特别是随着具有大存贮器寻址容量的高性能16位 MPU 的出现而更为复杂。为了保持高信息吞吐量,大量的数据必须由 MPU本身用具有最小干扰的快速而有效的方法在这些系统的范围内传送。MC68450直接存贮器存取控制器(DM-AC)是专门设计成通过提供下述性能以补充MC68000 MPU 的运转性能和结构性能的:
The microprocessors that make up the system have become more and more complex, especially as the advent of high-performance 16-bit MPUs with large memory addressing capabilities has become more sophisticated. In order to maintain high throughput of information, large amounts of data must be delivered by the MPU itself within the scope of these systems in a fast and efficient way with minimal disruption. The MC68450 Direct Memory Access Controller (DM-AC) is specifically designed to complement the operational and structural performance of the MC68000 MPU by providing the following features: