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AM29PDL129H Datasheet(PDF) 24 Page - SPANSION |
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AM29PDL129H Datasheet(HTML) 24 Page - SPANSION |
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24 / 49 page  22 Am29PDL129H November 2, 2005 Figure 3. SecSi Sector Protection Algorithm ■ To verify the protect/unprotect status of the SecSi Sector, follow the algorithm shown in Figure 4. START SecSiTM Sector Entry Write AAh to address 555h Write 55h to address 2AAh Write 88h to address 555h SecSi Sector Protection Entry Write AAh to address 555h Write 55h to address 2AAh Write 60h to address 555h PLSCNT = 1 Protect SecSi Sector: write 68h to sector address with A7–A0 = 00011010 Time out 256 μs Read from sector address with A7–A0 = 00011010 Data = 01h? Yes SecSi Sector Protection Completed SecSi Sector Exit Write 555h/AAh Write 2AAh/55h Write SA0+555h/90h Write XXXh/00h Verify SecSi Sector: write 48h to sector address with A7–A0 = 00011010 No |
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