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EP9315 Datasheet(PDF) 22 Page - Cirrus Logic |
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EP9315 Datasheet(HTML) 22 Page - Cirrus Logic |
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22 / 64 page  22 ©Copyright 2005 Cirrus Logic (All Rights Reserved) DS638PP4 EP9315 Enhanced Universal Platform SOC Processor Static Memory 32-bit Write on 8-bit External Bus Parameter Symbol Min Typ Max Unit AD setup to WRn assert time tADs tHCLK − 3- -ns WRn/DQMn deassert to AD transition time tADd -- tHCLK + 6 ns AD hold from WRn deassert time tADh tHCLK × 2 -- ns CSn hold from WRn deassert time tCSh 7- - ns CSn to WRn assert delay time tWRd -- 2 ns WRn assert time tWRpwL - tHCLK × (WST1 + 1) -ns WRn deassert time tWRpwH - tHCLK × 2(tHCLK × 2) + 14 ns CSn to DQMn assert delay time tDQMd -- 1 ns DQMn assert time tDQMpwL - tHCLK × (WST1 + 1) -ns DQMn deassert time tDQMpwH -- (tHCLK × 2) + 7 ns WRn / DQMn deassert to DA transition time tDAh tHCLK - -ns WRn / DQMn assert to DA valid time tDAV -- 8 ns Figure 9. Static Memory Multiple Word Write 8-bit Cycle Timing Measurement CSn WRn RDn DQMn AD DA t ADs t WRd t DQMd t WRpwL t DAh t WRpwH t ADd t CSh t ADh t DQMpwL t DQMpwH t WRpwL t WRpwH t WRpwL t WRpwH t DQMpwL t DQMpwH t DQMpwL t DQMpwH t DAh t DAh t DAh t ADd t ADd WAIT t DAV t DAV t DAV t DAV |
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