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A29L400UV-90U Datasheet(PDF) 11 Page - AMIC Technology |
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A29L400UV-90U Datasheet(HTML) 11 Page - AMIC Technology |
11 / 40 page A29L400 Series PRELIMINARY (October, 2002, Version 0.2) 11 AMIC Technology, Inc. START PLSCNT=1 RESET=V ID Wait 1 us First Write Cycle=60h? Set up sector address Sector Protect Write 60h to sector address with A6=0, A1=1, A0=0 Wait 150 us 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 Data=01h? Protect another sector? Remove V ID from RESET Write reset command Sector Protect complete Sector Protect Algorithm Temporary Sector Unprotect Mode Increment PLSCNT PLSCNT =25? Device failed No No No Yes Reset PLSCNT=1 Yes Yes No 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 START PLSCNT=1 RESET=V ID Wait 1 us First Write Cycle=60h? No Temporary Sector Unprotect Mode Yes No All sectors protected? Set up first sector address Sector Unprotect: Write 60h to sector address with A6=1, A1=1, A0=0 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 Data=00h? Last sector verified? Remove V ID from RESET Write reset Command Sector Unprotect complete Yes Yes Set up next sector address No Yes Yes Sector Unprotect Algorithm Increment PLSCNT PLSCNT= 1000? Device failed Yes No No Figure 2. In-System Sector Protect/Unprotect Algorithms |
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