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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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H8SX/1663 데이터시트(PDF) 334 Page - Renesas Technology Corp |
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H8SX/1663 데이터시트(HTML) 334 Page - Renesas Technology Corp |
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334 / 1158 page  Section 6 Bus Controller (BSC) Rev.1.00 Jun. 07, 2006 Page 282 of 1102 REJ09B0294-0100 Figure 6.81 shows the timing of setting SDRAM mode register. T p T r T c1 CS RAS CAS WE CKE High Mode register setting Mode register setting BS High RD/ WR High PALL NOP MRS NOP T c2 Precharge-sel Address bus SD φ Figure 6.81 Timing of Setting SDRAM Mode Register 6.11.15 SDRAM Interface and Single Address Transfer by DMAC When fast-page mode (BE = 1) is set for the SDRAM space, either fast-page access or full access can be selected, by the setting of bit DDS in DRAMCR, for the single address transfer by the DMAC where the SDRAM space is specified as the transfer source or destination. At the same time, the output timing of the DACK and BS signals can be changed. When BE = 0, a full access to the SDRAM space is performed with a single address transfer regardless of the setting of bit DDS. However, the output timing of the DACK and BS signals can be changed by the setting of bit DDS. The assertion timing of the DACK signals can be changed by the bit DKC in BCR1. The output timing of the DACK signal can be independently set by the bits TRWL and CKSPE in SDCR and bit DCK in BCR1 regardless of the setting of bit DDS. |
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