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FM20L08 Folha de dados(PDF) 6 Page - Ramtron International Corporation |
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FM20L08 Folha de dados(HTML) 6 Page - Ramtron International Corporation |
6 / 14 page FM20L08 - Industrial Temp. Rev. 1.72 May 2007 Page 6 of 14 Normal Memory Operation Read 05555h? Read 1AAAAh? Any other operation Read 03333h? Read 1CCCCh? Read 100FFh? Read 0FF00? Hold Data Byte Write 1CCCC? Data Complement? y n n n n n y y y y y n y Write 1AAAA? y Write 0FF00 y n Read 00000 Enter new write protect settings n Read 1AAAA Write 1CCCC? y Drive write protect data out Read 00000 n y n Change Write Protect Settings Read Write Protect Settings Sequence Detector Figure 2. Write-Protect State Machine For example, the following sequence write-protects addresses from 00000h to 07FFFh and 10000h to 13FFFh (sectors 0, 1 & 4): Address Data Read 05555h - Read 1AAAAh - Read 03333h - Read 1CCCCh - Read 100FFh - Read 0FF00h - Write 1AAAAh 13h ; bits 0, 1, 4 = 1 Write 1CCCCh Ech ; complement of 13h Write 0FF00h - ; Data is don’t care Read 00000h - ; return to Normal Operation |
Nº de peça semelhante - FM20L08_07 |
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Descrição semelhante - FM20L08_07 |
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