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数据搜索系统，热门电子元器件搜索 |
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DP8430V 数据表(PDF) 13 Page - National Semiconductor (TI) |
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DP8430V 数据表(HTML) 13 Page - National Semiconductor (TI) |
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13 / 56 page  40 Port A Access Modes (Continued) 42 ACCESS MODE 1 Mode 1 asynchronous access is selected by asserting the input B1 during programming (B1e1) This mode allows ac- cesses to start immediately from the access request input ADS To initiate a Mode 1 access CS is asserted followed by ADS asserted If precharge time was met a refresh of the DRAM or a Port B access was not in progress the RAS (RASs) would be asserted from ADS being asserted If a refresh or Port B access is in progress or precharge time is required the controller will wait until these events have tak- en place and assert RAS (RASs) from the next rising edge of clock When ADS is asserted or sometime after AREQ must be asserted At this time ADS can be negated and AREQ will continue the access Also ADS can continue to be asserted after AREQ has been asserted and negated however a new access will not start until ADS is negated and asserted again When address pipelining is not implemented ADS and AREQ can be tied together The access will end when AREQ is negated TLF11118 – 9 FIGURE 8b Access Mode 1 13 |
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