| Datenblatt-Suchmaschine für elektronische Bauteile |
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H8SX/1663R Datenblatt(PDF) 315 Page - Renesas Technology Corp |
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H8SX/1663R Datenblatt(HTML) 315 Page - Renesas Technology Corp |
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315 / 1504 page ![]() Section 9 Bus Controller (BSC) Rev. 2.00 Sep. 24, 2008 Page 283 of 1468 REJ09B0412-0200 9.10.6 Controlling Column Address Output Cycle The number of column address output cycles can be changed from two to three clock cycles by setting the CAST bit in DRAMCR. Set the bit according to the DRAM to be used and the frequency of this LSI so that the CAS pulse width can be optimal. Figure 9.39 shows a timing example when the number of column address output cycles is set to three clock cycles. T p T r T c1 T c2 T c3 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 9.39 Access Timing Example of Column Address Output Cycles for 3 Clock Cycles (RAST = 0) |
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