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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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SH7708 데이터시트(PDF) 280 Page - Renesas Technology Corp |
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SH7708 데이터시트(HTML) 280 Page - Renesas Technology Corp |
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280 / 633 page  262 Burst Write: The timing chart for a burst write is shown in figure 10.27. In the SH7708 Series, a burst write occurs only in the event of cache copy-back. In a burst write operation, following the Tr cycle in which ACTV command output is performed, a WRIT command is issued in the Tc1, Tc2, and Tc3 cycles, and a WRITA command that performs auto-precharge is issued in the Tc4 cycle. In the write cycle, the write data is output at the same time as the write command. For the write with auto-precharge command, precharging of the relevant bank is performed in the synchronous DRAM after completion of the write command, and therefore no command can be issued for the same bank until precharging is completed. Consequently, in addition to the precharge wait cycle, Tpc, used in a read access, cycle Trwl is added as a wait interval until precharging is started, following the write command. Issuance of a new command for the same bank is postponed during this interval. The number of Trwl cycles can be specified by the TRWL bit in MCR. |
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