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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) 318 Page - Renesas Technology Corp |
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H8SX1663 数据表(HTML) 318 Page - Renesas Technology Corp |
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318 / 1158 page  Section 6 Bus Controller (BSC) Rev.1.00 Jun. 07, 2006 Page 266 of 1102 REJ09B0294-0100 6.11.10 Controlling Write-Precharge Delay In an SDRAM write cycle, a certain time is required until the write operation is completed inside of the SDRAM. When the time between the WRIT command and the subsequent PALL command does not meet a given specification, the Trwl cycle can be inserted for one cycle by the TRWL bit in SDCR. Whether or not to insert the Trwl cycle depends on the SDRAM to be used and the frequency of this LSI. Figure 6.68 shows a timing example when one Trwl cycle is inserted. T p T r T rwl T c1 T c2 Address bus Row address Column address SD φ CS Precharge-sel RAS CAS WE CKE PALL ACTV WRIT NOP NOP DQMLU DQMLL D7 to D0 BS RD/ WR D15 to D8 Row address High Figure 6.68 Write Timing Example when Write-Precharge Delay Cycle Insertion (TRWL = 1) |
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