SH7708 Datasheet, PDF (286/625 Pages) Renesas Technology Corp – SuperH™ RISC engine

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 10.32 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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