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H8SX/1663M Datasheet(PDF) 317 Page - Renesas Technology Corp |
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H8SX/1663M Datasheet(HTML) 317 Page - Renesas Technology Corp |
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317 / 1504 page  Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 285 of 1468 REJ09B0412-0200 To ensure the row address hold time or read access time, one to three of Trw cycles in which the row address output is retained can be inserted between the Tr and Tc1 cycles. The RAS signal is driven low in the Tr cycle and the column address is output in the Tc1 cycle. Set the bit according to the DRAM to be used and the frequency of this LSI so that the row address hold time to the rising edge of the RAS signal is ensured. Figure 9.41 shows an access timing example when one Trw cycle is specified. T p T r T rw T c1 T c2 Address bus Row address Column address B φ RAS LUCAS LLCAS WE OE (RD) WE OE (RD) Data bus High High Read Write Data bus BS RD/ WR Figure 9.41 Access Timing Example when One Trw Cycle is Specified (RAST=0, CAST=0) |
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