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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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Z80 数据表(PDF) 71 Page - Zilog, Inc. |
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Z80 数据表(HTML) 71 Page - Zilog, Inc. |
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71 / 330 page  < %27 2GTKRJGTCNU 7UGT /CPWCN UM008101-0601 Direct Memory Access Figure 22. Burst Mode In the Burst mode (Figure 22), the bus is requested in the same manner as previously, but when the DMA has control of the bus it continues to transfer bytes until it encounters either an inactive Ready signal from an I/O port, an end-of-block, or a byte match as in Figure 20. If the Ready line goes inactive before end-of-block is reached, the DMA releases the bus to the CPU and repetitively tests the Ready signal until it comes active again. Then it requests the bus again and continues its transfers. Because of this, the Burst mode is often the most useful one for general-purpose applica- tions. It does not request the bus until it actually can use it, but once it RDY Active ? • Interrupt •Release Bus • Auto Restart Request Bus Enable DMA End ? of Block NO NO YES Set Status Flag NO Request Bus RDY Active ? YES YES Transfer/Search One Byte (See Figure 20) |
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