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AM70PDL129CDH データシート(PDF) 91 Page - SPANSION |
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AM70PDL129CDH データシート(HTML) 91 Page - SPANSION |
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91 / 127 page  November 24, 2003 Am70PDL127CDH/Am70PDL129CDH 89 ADV ANCE I N FO RMAT I O N Figure 2. In-System Sector Group Protect/Unprotect Algorithms Sector Group Protect: Write 60h to sector group address with A6–A0 = 0xx0010 Set up sector group address Wait 150 µs Verify Sector Group Protect: Write 40h to sector group address with A6–A0 = 0xx0010 Read from sector group address with A6–A0 = 0xx0010 START PLSCNT = 1 RESET# = VID Wait 1 µs First Write Cycle = 60h? Data = 01h? Remove VID from RESET# Write reset command Sector Group Protect complete Yes Yes No PLSCNT = 25? Yes Device failed Increment PLSCNT Temporary Sector Group Unprotect Mode No Sector Group Unprotect: Write 60h to sector group address with A6–A0 = 1xx0010 Set up first sector group address Wait 15 ms Verify Sector Group Unprotect: Write 40h to sector group address with A6–A0 = 1xx0010 Read from sector group address with A6–A0 = 1xx0010 START PLSCNT = 1 RESET# = VID Wait 1 µs Data = 00h? Last sector group verified? Remove VID from RESET# Write reset command Sector Group Unprotect complete Yes No PLSCNT = 1000? Yes Device failed Increment PLSCNT Temporary Sector Group Unprotect Mode No All sector groups protected? Yes Protect all sector groups: The indicated portion of the sector group protect algorithm must be performed for all unprotected sector groups prior to issuing the first sector group unprotect address Set up next sector group address No Yes No Yes No No Yes No Sector Group Protect Algorithm Sector Group Unprotect Algorithm First Write Cycle = 60h? Protect another sector group? Reset PLSCNT = 1 |
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