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Datenblatt-Suchmaschine für elektronische Bauteile |
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Datenblatt-Suchmaschine für elektronische Bauteile |
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H8SX/1663R Datenblatt(PDF) 329 Page - Renesas Technology Corp |
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H8SX/1663R Datenblatt(HTML) 329 Page - Renesas Technology Corp |
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329 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 297 of 1468 REJ09B0412-0200 (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 9.51 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 9.51 Timing Example of RAS Up Mode (RAST = 0, CAST = 0) |
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