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HY29F800ABT-12 Datasheet(PDF) 8 Page - Hynix Semiconductor |
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HY29F800ABT-12 Datasheet(HTML) 8 Page - Hynix Semiconductor |
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8 / 40 page  8 Rev. 1.1/Feb 02 HY29F800A Figure 1. Sector Protect Procedure the duration of the RESET# pulse. The device also resets the internal state machine to reading array data. If an operation was interrupted by the as- sertion of RESET#, it should be reinitiated once the device is ready to accept another command sequence to ensure data integrity. Current is reduced for the duration of the RESET# pulse as described in the Standby Operation sec- tion above. If RESET# is asserted during a program or erase operation, the RY/BY# pin remains Low (busy) until the internal reset operation is complete, which re- quires a time of t READY (during Automatic Algo- rithms). The system can thus monitor RY/BY# to determine when the reset operation completes, and can perform a read or write operation t RB after RY/BY# goes High. If RESET# is asserted when a program or erase operation is not executing (RY/ BY# pin is High), the reset operation is completed within a time of t RP. In this case, the host can per- form a read or write operation t RH after the RE- SET# pin returns High . The RESET# pin may be tied to the system reset signal. Thus, a system reset would also reset the device, enabling the system to read the boot-up firmware from the Flash memory. Sector Protect/Unprotect Operations Hardware sector protection can be invoked to dis- able program and erase operations in any single sector or combination of sectors. This function is typically used to protect data in the device from unauthorized or accidental attempts to program or erase the device while it is in the system (e.g., by a virus) and is implemented using programming equipment. Sector unprotection re-enables the program and erase operations in previously pro- tected sectors. Table 1 identifies the nineteen sectors and the address range that each covers. The device is shipped with all sectors unprotected. The sector protect/unprotect operations require a high voltage (V ID) on address pin A[9] and the CE# and/or OE# control pins, as detailed in Table 3. When implementing these operations, note that V CC must be applied to the device before applying V ID, and that VID should be removed before remov- ing V CC from the device. START Set TRYCNT = 1 Set A9 = OE# = V ID Set Address: A[18:12] = Sector to Protect CE# = V IL RESET# = V IH WE# = V IL Wait t WPP1 A9 = V ID A[18:12] = Sector to Protect OE# = CE# = A6 = A0 = V IL A1 = V IH Read Data Data = 0x01? Protect Another Sector? YES TRYCNT = 25? NO Increment TRYCNT NO YES DEVICE FAILURE YES NO Remove V ID from A9 SECTOR PROTECT COMPLETE APPLY V CC WE# = V IH |
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