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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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H8SX/1663M 데이터시트(PDF) 362 Page - Renesas Technology Corp |
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H8SX/1663M 데이터시트(HTML) 362 Page - Renesas Technology Corp |
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362 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 330 of 1468 REJ09B0412-0200 When the time between the REF command and the subsequent ACTV command does not meet a given specification, a wait cycle can be inserted for one to seven cycles during a refresh cycle by bits RLW2 to RLW0 in REFCR. Set the bit according to the SDRAM to be used and the frequency of this LSI so that the number of wait cycles can be optimal. Figure 9.78 shows a timing example when the one wait cycle is inserted. TR p TR r TR cw TR c1 TR c2 Address bus SDRAM φ CS Precharge-sel RAS CAS WE CKE PALL REF NOP BS RD/ WR High High High Figure 9.78 Auto-Refresh Timing (TPC1 = 0, TPC0 = 0, RLW2 = 0, RLW1 = 0, RLW0 = 1) |
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