SH7020 Datasheet, PDF (179/509 Pages) Renesas Technology Corp – SuperH™ RISC engine

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8.11 Usage Notes
8.11.1 Usage Notes on Manual Reset
Condition: When DRAM (long-pitch mode) is used and manual reset is performed.
The low width of RAS output may be shorter than usual in rese + (2.5tcyc→1.5tcyc), causing the
specified value (tRAS) of DRAM not to be satisfied.
Corresponding DRAM conditions: long pitch/normal mode
long pitch/high-speed page mode
There are no problems regarding operations except for the above conditions.
There are the following four cases (Figure 8.38 to Figure 8.41) for the output states of DRAM
control signals (RAS, CAS, and WR) corresponding to RES latch timing. Actual output levels are
shown by solid lines (not by dashed lines).
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