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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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H8SX/1663M 데이터시트(PDF) 373 Page - Renesas Technology Corp |
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H8SX/1663M 데이터시트(HTML) 373 Page - Renesas Technology Corp |
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373 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 341 of 1468 REJ09B0412-0200 (3) When TRWL = 1 When the SDRAM interface is written to, one Trwl cycle is inserted after the Tc2 cycle. The DACK and EDACK signals stay asserted until the end of the Trwl cycle. The hold time of data output from an external device can be extended by one cycle. Figure 9.87 shows an output timing example of the DACK and EDACK signals when TRWL = 1 with DDS = 1, EDDS = 1, DKC = 0 and EDKC = 0. T p T r T c1 T c2 T rwl T c1 T c2 T rwl SDRAM φ Address bus Row address Column address 2 Column address 1 CS Precharge-sel RAS CAS WE CKE PALL ACTV NOP NOP WRIT WRIT NOP DQMLU DQMLL D7 to D0 BS DACK or EDACK RD/ WR D15 to D8 Row address High Figure 9.87 Output Timing Example of DACK and EDACK when TRWL = 1 (Write) |
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