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AM70PDL127CDH Datasheet(PDF) 42 Page - SPANSION |
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AM70PDL127CDH Datasheet(HTML) 42 Page - SPANSION |
42 / 127 page 40 Am70PDL127CDH/Am70PDL129CDH November 24, 2003 ADV ANCE I N FO RMAT I O N Figure 1. In-System Sector Protection/ Sector Unprotection Algorithms Sector Protect: Write 60h to sector address with A7-A0 = 00000010 Set up sector address Wait 100 µs Verify Sector Protect: Write 40h to sector address with A7-A0 = 00000010 Read from sector address with A7-A0 = 00000010 START PLSCNT = 1 RESET# = VID Wait 4 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 A7-A0 = 01000010 Set up first sector address Wait 1.2 ms Verify Sector Unprotect: Write 40h to sector address with A7-A0 = 00000010 Read from sector address with A7-A0 = 00000010 START PLSCNT = 1 RESET# = VID Wait 4 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 Remove VID from RESET# Write reset command Sector Protect complete Remove VID from RESET# Write reset command Sector Unprotect complete |
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