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HD6432351 Datasheet(PDF) 204 Page - Renesas Technology Corp |
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HD6432351 Datasheet(HTML) 204 Page - Renesas Technology Corp |
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204 / 1025 page  Section 6 Bus Controller Rev. 3.00 Sep 15, 2006 page 170 of 988 REJ09B0330-0300 (1) Burst Access (Fast Page Mode) Operation Timing Figure 6.20 shows the operation timing for burst access. When there are consecutive access cycles for DRAM space, the CAS signal and column address output cycles (two states) continue as long as the row address is the same for consecutive access cycles. The row address used for the comparison is set with bits MXC1 and MXC0 in MCR. Tp φ CSn (RAS) Read Write CAS, LCAS HWR (WE) D15 to D0 HWR (WE) D15 to D0 A23 to A0 Tr Tc1 Tc2 row column1 column2 Tc1 Tc2 Note: n = 2 to 5 Figure 6.20 Operation Timing in Fast Page Mode (2-WE System) The bus cycle can also be extended in burst access by inserting wait states. The wait state insertion method and timing are the same as for full access. For details, see section 6.5.8, Wait Control. |
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