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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) 284 Page - Renesas Technology Corp |
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H8SX1663 数据表(HTML) 284 Page - Renesas Technology Corp |
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284 / 1158 page  Section 6 Bus Controller (BSC) Rev.1.00 Jun. 07, 2006 Page 232 of 1102 REJ09B0294-0100 6.10.7 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 6.40 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 6.40 Access Timing Example of RAS Signal Driven Low at Start of Tr Cycle (CAST = 0) |
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