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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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SH7041A 数据表(PDF) 229 Page - Renesas Technology Corp |
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SH7041A 数据表(HTML) 229 Page - Renesas Technology Corp |
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229 / 923 page  191 10.4.3 Wait State Control Wait state insertion during DRAM space access is controlled by setting the TPC, RCD, DWW1, DWW0, DWR1, and DWR0 bits of the DCR. TPC and RCD are common to both reads and writes. The timing with waits inserted is shown in figures 10.8 through 10.11. External waits can be inserted at the time of software waits 2, 3. The sampling location is the same as that of ordinary space: at one cycle before the Tc2 cycle clock rise. Wait cycles are extended by external waits. Tp Tr Tc1 Tcw1 Tc2 CK Write Read Address Data RAS CASx RDWR Data RDWR CASx RAS Row Column Figure 10.8 DRAM Bus Cycle (Normal Mode, TPC = 0, RCD = 0, One Wait) |
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