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S29AL032D90TFI000 Datasheet(PDF) 27 Page - SPANSION |
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S29AL032D90TFI000 Datasheet(HTML) 27 Page - SPANSION |
27 / 69 page June 13, 2005 S29AL032D_00_A3 S29AL032D 25 Ad vance Info rmat i o n Figure 2. In-System Sector Protect/Unprotect Algorithms Sector Protect: Write 60h to sector address with A6 = 0, A1 = 1, A0 = 0 Set up sector address Wait 150 µs Verify Sector Protect: Write 40h to sector address with A6 = 0, A1 = 1, A0 = 0 Read from sector address with A6 = 0, A1 = 1, A0 = 0 START PLSCNT = 1 RESET# = VID Wait 1 μs First Write Cycle = 60h? Data = 01h? Remove VID from RESET# Write reset command Sector Protect complete Yes Yes No PLSCNT = 25? Yes Device failed Increment PLSCNT Temporary Sector Unprotect Mode No Sector Unprotect: Write 60h to sector address with A6 = 1, A1 = 1, A0 = 0 Set up first sector address Wait 15 ms Verify Sector Unprotect: Write 40h to sector address with A6 = 1, A1 = 1, A0 = 0 Read from sector address with A6 = 1, A1 = 1, A0 = 0 START PLSCNT = 1 RESET# = VID Wait 1 μs Data = 00h? Last sector verified? Remove VID from RESET# Write reset command Sector Unprotect complete Yes No PLSCNT = 1000? Yes Device failed Increment PLSCNT Temporary Sector Unprotect Mode No All sectors protected? Yes Protect all sectors: The indicated portion of the sector protect algorithm must be performed for all unprotected sectors prior to issuing the first sector unprotect address Set up next sector address No Yes No Yes No No Yes No Sector Protect Algorithm Sector Unprotect Algorithm First Write Cycle = 60h? Protect another sector? Reset PLSCNT = 1 |
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