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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HD6432351 데이터시트(PDF) 217 Page - Renesas Technology Corp |
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HD6432351 데이터시트(HTML) 217 Page - Renesas Technology Corp |
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217 / 1025 page  Section 6 Bus Controller Rev. 3.00 Sep 15, 2006 page 183 of 988 REJ09B0330-0300 (3) Relationship between Chip Select ( CS CS CS CS) Signal and Read (RD RD RD RD) Signal Depending on the system’s load conditions, the RD signal may lag behind the CS signal. An example is shown in figure 6.33. In this case, with the setting for no idle cycle insertion (a), there may be a period of overlap between the bus cycle A RD signal and the bus cycle B CS signal. Setting idle cycle insertion, as in (b), however, will prevent any overlap between the RD and CS signals. In the initial state after reset release, idle cycle insertion (b) is set. T1 Address bus φ RD Bus cycle A T2 T3 T1 T2 Bus cycle B Possibility of overlap between CS (area B) and RD T1 Address bus φ Bus cycle A T2 T3 TI T1 Bus cycle B T2 CS (area A) CS (area B) RD CS (area A) CS (area B) (a) Idle cycle not inserted (ICIS1 = 0) (b) Idle cycle inserted (Initial value ICIS1 = 1) Figure 6.33 Relationship between Chip Select ( CS CS CS CS) and Read (RD RD RD RD) |
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