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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) 350 Page - Renesas Technology Corp |
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H8SX/1663R Datenblatt(HTML) 350 Page - Renesas Technology Corp |
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350 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 318 of 1468 REJ09B0412-0200 9.11.10 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 9.68 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 SDRAM 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 9.68 Write Timing Example when Write-Precharge Delay Cycle Insertion (TRWL = 1) |
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