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SH7708 数据表(PDF) 289 Page - Renesas Technology Corp |
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SH7708 数据表(HTML) 289 Page - Renesas Technology Corp |
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289 / 633 page ![]() 271 10.3.6 Pseudo-SRAM Direct Connection When the memory type bits (DRAMTP2-0) in BCR1 are set to 001, physical space area 3 becomes pseudo-SRAM and the pseudo-SRAM interface function that allows pseudo-SRAM to be connected directly to the SH7708 Series can be used. An interface data width of 16 or 32 bits can be selected. With directly connected pseudo-SRAM, the refresh signal and output enable signal are multiplexed. The signals used for connection are CE, OE/RFSH, WE3, WE2, WE1, and WE0. WE3 and WE2 are not used with a 16-bit data width. As access modes, burst access using the static column access function is supported in addition to ordinary read/write access. Figure 10.33 shows an example of connection of 4M pseudo-SRAMs with multiplexed OE and RFSH signals, using a 32-bit data width. |
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