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Os motores de busca de Datasheet de Componentes eletrônicos |
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Os motores de busca de Datasheet de Componentes eletrônicos |
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H8SX/1663M Folha de dados(PDF) 341 Page - Renesas Technology Corp |
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H8SX/1663M Folha de dados(HTML) 341 Page - Renesas Technology Corp |
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341 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 309 of 1468 REJ09B0412-0200 9.11.5 Basic Timing Figures 9.60 and 9.61 show a basic access timing of the SDRAM space. A basic read cycle consists of five clock cycles: one precharge cycle (Tp), one row address output cycle (Tr), and three column address output cycles (Tc1, Tcl, and Tc2). A basic write cycle consists of four clock cycles: one precharge cycle (Tp), one row address output cycle (Tr), and two column address output cycles (Tc1 and Tc2). When the SDRAM space is selected, the WAITE bit in BCR, the RAST and CAST bits in DRAMCR, bits RCW1 and RCW0 in REFCR are ignored. Tp Tr Tc1 Tcl Tc2 Address bus Row address Column address SDRAM φ CS Precharge-sel RAS CAS WE CKE PALL ACTV READ NOP DQMLU DQMLL D7 to D0 BS RD/ WR D15 to D8 Row address Figure 9.60 SDRAM Basic Read Access Timing (CAS Latency = 2) |
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