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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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SH7041A 数据表(PDF) 291 Page - Renesas Technology Corp |
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SH7041A 数据表(HTML) 291 Page - Renesas Technology Corp |
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291 / 923 page  253 Burst Mode, Dual Address, and Level Detection: DREQ sampling timing in burst mode with dual address and level detection is virtually the same as that of cycle steal mode. For example, DMAC transfer begins (figure 11.19), at the earliest, three cycles after the timing of the first sampling. The second sampling also begins from the start of the transfer one bus cycle before the start of the first DMAC transfer. In burst mode, as long as transfer requests are issued, DMAC transfer continues. Therefore, the “transfer one bus cycle before the start of the DMAC transfer” may be a DMAC transfer. In burst mode, the DACK output period is the same as that of cycle steal mode. Figure 11.20 shows the normal operation of this burst mode. |
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