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Z80-DMA(直接存贮存取控制器)是可编程的对数据进行控制、处理和传送的部件。其基本思想是脱离CPU由DMA控制系统总线,从而大大提高数据的传送速率。其传送速率可达100万字节/秒(Z80-DMA_A)～200万字节/秒(Z80-DMA_C),检索速率可达1.25兆字节/秒～2.5兆字节/秒。其基本功能为: 1.在两口之间进行数据传送(存贮器、I/ON); 2.对一个存贮器或I/O设备检索; 3.在两口之间既传送又检索。系统连接示意图见图1。
The Z80-DMA (Direct Memory Access Controller) is a programmable part of the control, processing and delivery of data. The basic idea is out of the CPU by the DMA control system bus, thereby greatly increasing the data transfer rate. The transfer rate of up to 1 million bytes / second (Z80-DMA_A) ~ 2 million bytes / second (Z80-DMA_C), the retrieval rate of up to 1.25 megabytes / second to 2.5 megabytes / second. Its basic functions are: 1. Data transfer between two ports (memory, I / O); 2. Retrieval of a memory or I / O device; 3. Transmission and retrieval between two ports. System connection diagram shown in Figure 1.