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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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H8SX/1663R Fiches technique(PDF) 316 Page - Renesas Technology Corp |
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H8SX/1663R Fiches technique(HTML) 316 Page - Renesas Technology Corp |
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316 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 284 of 1468 REJ09B0412-0200 9.10.7 Controlling Row Address Output Cycle The RAS signal is driven low at the start of the Tr cycle by setting the RAST bit to 1. The row address hold time to the falling edge of the RAS signal and the DRAM read access time are changed. Set the bit according to the DRAM to be used and the frequency of this LSI so that required performance can be obtained. Figure 9.40 shows a timing example when the RAS signal is driven low at the start of the Tr cycle. T p T r T c1 T c2 Address bus Row address Column address B φ RAS LUCAS LLCAS WE OE (RD) WE OE (RD) Data bus High High Read Write Data bus BS RD/ WR Figure 9.40 Access Timing Example of RAS Signal Driven Low at Start of Tr Cycle (CAST = 0) |
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