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HY29LV400TF70 Datasheet(PDF) 9 Page - Hynix Semiconductor |
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HY29LV400TF70 Datasheet(HTML) 9 Page - Hynix Semiconductor |
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9 / 40 page  9 Rev. 1.0/Nov. 01 HY29LV400 Sector Protect Operation The hardware sector protection feature disables both program and erase operations in any sector or combination of sectors. This function can be implemented either in-system or by using program- ming equipment. The Sector Protect procedure requires V ID on the RESET# pin and uses standard microprocessor bus cycle timing to implement sector protection. The flow chart in Figure 1 illustrates the algorithm. The HY29LV400 is shipped with all sectors un- protected. It is possible to determine whether a sector is protected or unprotected. See the Elec- tronic ID Mode section for details. Sector Unprotect Operation The hardware sector unprotection feature re-en- ables both program and erase operations in pre- viously protected sectors. This function can be implemented either in-system or by using program- ming equipment. Note that to unprotect any sec- tor, all unprotected sectors must first be protected prior to the first sector unprotect write cycle. Also, the unprotect procedure will cause all sectors to become unprotected, thus, sectors that require START RESET# = V ID Wait 1 us Write 0x60 to device Write 0x60 to Address Wait 150 us Write 0x40 to Address Read from Address Data = 0x01? Protect Another Sector? YES TRYCNT = 25? NO Increment TRYCNT NO YES DEVICE FAILURE YES NO RESET# = V IH Write Reset Command SECTOR PROTECT COMPLETE TRYCNT = 1 Set Address: A[17:12] = Sector to Protect A[6] = 0, A[1] = 1, A[0] = 0 Figure 1. Sector Protect Algorithm protection must be protected again after the un- protect procedure is run. The Sector Unprotect procedure requires V ID on the RESET# pin and uses standard microproces- sor bus cycle timing to implement sector unpro- tection. The flow chart in Figure 2 illustrates the algorithm. Temporary Sector Unprotect Operation This feature allows temporary unprotection of pre- viously protected sectors to allow changing the data in-system. Sector Unprotect mode is activated by setting the RESET# pin to V ID. While in this mode, formerly protected sectors can be pro- grammed or erased by invoking the appropriate 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. Electronic ID Operation (High Voltage Method) The Electronic ID mode provides manufacturer and device identification and sector protection verifi- cation through codes output on DQ[15:0]. This mode is intended primarily for programming equip- ment to automatically match a device to be pro- |
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