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HD6432351 bảng dữ liệu(PDF) 299 Page - Renesas Technology Corp |
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HD6432351 bảng dữ liệu(HTML) 299 Page - Renesas Technology Corp |
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299 / 1025 page  Section 7 DMA Controller (DMAC) Rev. 3.00 Sep 15, 2006 page 265 of 988 REJ09B0330-0300 Full Address Mode (Cycle Steal Mode) Figure 7.20 shows a transfer example in which TEND output is enabled and word-size full address mode transfer (cycle steal mode) is performed from external 16-bit, 2-state access space to external 16-bit, 2-state access space. DMA read φ Address bus RD LWR TEND HWR Bus release Last transfer cycle DMA write DMA read DMA write DMA read DMA write DMA dead Bus release Bus release Bus release Figure 7.20 Example of Full Address Mode (Cycle Steal) Transfer A one-byte or one-word transfer is performed, and after the transfer the bus is released. While the bus is released one bus cycle is inserted by the CPU or DTC. In the transfer end cycle (the cycle in which the transfer counter reaches 0), a one-state DMA dead cycle is inserted after the DMA write cycle. |
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