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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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SH7708 Datasheet(PDF) 278 Page - Renesas Technology Corp |
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SH7708 Datasheet(HTML) 278 Page - Renesas Technology Corp |
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278 / 633 page  260 Figure 10.25 shows the burst read timing when RCD is set to 1, A3W1 and A3W0 are set to 10, and TPC is set to 1. The BS cycle, which is asserted for one cycle at the start of a bus cycle for normal access space, is asserted in each of cycles Td1–Td4 in a synchronous DRAM cycle. When a burst read is performed, the address is updated each time CAS is asserted. As the unit of burst transfer is 16 bytes, address updating is performed for A3 and A2 only. In a fill operation in the event of a cache miss, the order of access is: the missed data is read first, then 16-byte boundary data including the missed data is read in wraparound mode. CKIO A25 to A16, A13 A12 A15, A14, A11 to A0 CS2 or CS3 RAS CAS RD/ WR DQMxx D31 to D0 BS Tr Tc1 Tc2 Tc3/Td1 Tc4/Td2 Td3 Tpc Trw Td4 Figure 10.25 Synchronous DRAM Burst Read Wait Specification Timing |
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