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M750000004 Datasheet(PDF) 47 Page - SPANSION |
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M750000004 Datasheet(HTML) 47 Page - SPANSION |
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47 / 129 page  January 14, 2004 Am75PDL191CHHa/Am75PDL193CHHa 45 ADV ANCE I N FO RMAT I O N Figure 3. PDL127H SecSi Sector Protection Algorithm 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 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 Increment PLSCNT PLSCNT = 25? Device Failed SecSi Sector Entry SecSi Sector Protection SecSi Sector Exit No No |
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