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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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H8SX1663 数据表(PDF) 297 Page - Renesas Technology Corp |
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H8SX1663 数据表(HTML) 297 Page - Renesas Technology Corp |
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297 / 1158 page  Section 6 Bus Controller (BSC) Rev.1.00 Jun. 07, 2006 Page 245 of 1102 REJ09B0294-0100 (b) RAS Up Mode Set the BE bit in DRAMCR to 1 and clear the RCDM bit in DRAMCR to 0 to set the RAS up mode. Whenever a DRAM space access is halted and other spaces are accessed, the RAS signal is driven high. Only when the DRAM space continues to be accessed, the fast-page mode access (burst access) is performed. Figure 6.51 shows a timing example of RAS up mode. T p T r T c1 T c2 T 2 T 1 T c1 T c2 RAS LUCAS LLCAS WE RD OE High BS RD/ WR Row address Column address DRAM space read Basic bus space read DRAM space read External address Column address B φ Address bus Data bus Figure 6.51 Timing Example of RAS Up Mode (RAST = 0, CAST = 0) |
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