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HY29F400ATT-55I Datasheet(PDF) 9 Page - Hynix Semiconductor |
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HY29F400ATT-55I Datasheet(HTML) 9 Page - Hynix Semiconductor |
9 / 40 page 9 Rev. 1.0/Jan. 02 HY29F400A The procedure for sector unprotection is illustrated in the flow chart in Figure 2, and timing specifica- tions and waveforms are given at the end of this document. Note that to unprotect any sector, all unprotected sectors must first be protected prior to the first unprotect write cycle. Sectors can also be temporarily unprotected as described in the next section. Temporary Sector Unprotect Operation This feature allows temporary unprotection of pre- viously protected sectors to allow changing the data in-system. Temporary Sector Unprotect mode is activated by setting the RESET# pin to V ID. While in this mode, formerly protected sectors can be programmed or erased by invoking the appropri- ate commands (see Device Commands section). Once V ID is removed from RESET#, all the previ- ously protected sectors are protected again. Fig- ure 3 illustrates the algorithm. START NOTE: All sectors must be previously protected. Set: TRYCNT = 1 Set: A[9] = CE# = OE# = V ID Set: RESET# = V IH WE# = V IL Wait t WPP2 Set: A[9] = V ID OE# = CE# = V IL Read Data Data = 0x00? NSEC = 10? YES TRYCNT = 1000? NO Increment TRYCNT NO YES DEVICE FAILURE NO YES Remove V ID from A[9] SECTOR UNPROTECT COMPLETE APPLY V CC Set Sector Address: A[17:12] = Sector NSEC A[0] = A[6] = V IL A[1] = V IH NSEC = NSEC + 1 Set: NSEC = 0 WE# = V IH Figure 2. Sector Unprotect Procedure START RESET# = V ID (All protected sector groups become unprotected) Perform Program or Erase Operations RESET# = V IH (All previously protected sector groups return to protected state) TEMPORARY SECTOR UNPROTECT COMPLETE Figure 3. Temporary Sector Unprotect |
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