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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SH7708 датащи(PDF) 318 Page - Renesas Technology Corp |
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SH7708 датащи(HTML) 318 Page - Renesas Technology Corp |
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318 / 633 page  300 10.4.5 Note on DRAM Connection for Areas 2 and 3 When area 2 or area 3 is connected to DRAM in the SH7708 or SH7708S, if a DRAM access request occurs immediately after a CAS-before-RAS refresh, the RAS precharge cycle value (tPC) always assumes its initial value regardless of the value set in MCR. Thus, the interval from RAS negation to the next RAS assertion in CAS-before-RAS refreshing is a two-cycle output interval (see figure below). If a request does not immediately follow a CAS-before-RAS refresh, the number of RAS precharge cycles set by the MCR value are secured. Two cycles RAS negation in CAS-before- RAS refreshing RAS asserted by next bus access CKIO RAS Restriction: If a DRAM access request occurs immediately after a CAS-before-RAS refresh, the interval from RAS negation to the next RAS assertion is two cycles. |
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