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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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H8SX/1663R 数据表(PDF) 371 Page - Renesas Technology Corp |
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H8SX/1663R 数据表(HTML) 371 Page - Renesas Technology Corp |
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371 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 339 of 1468 REJ09B0412-0200 (2) When DDS = 0 or EDDS = 0 Single address transfer by the DMAC or EXDMAC takes place as a full access (normal access) to the SDRAM space. The DACK and EDACK signals are asserted within the Tr cycle and the BS signal is also asserted in the Tr cycle. When the SDRAM space is accessed with other than the single address transfer by the DMAC or EXDMAC, a fast-page access is available. Figures 9.85 and 9.86 show an output timing example of the DACK and EDACK signals when DDS = 0 or EDDS = 0. T p T r T c1 T c2 Address bus Row address Column address SDRAM φ CS Precharge-sel RAS CAS WE CKE PALL ACTV WRIT NOP DQMLU DQMLL D7 to D0 BS RD/ WR D15 to D8 Row address High DACK or EDACK Figure 9.85 Output Timing Example of DACK and EDACK when DDS = 0 or EDDS = 0 (Write) |
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