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HY29F400BT70 Datasheet(PDF) 8 Page - Hynix Semiconductor |
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HY29F400BT70 Datasheet(HTML) 8 Page - Hynix Semiconductor |
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8 / 40 page  8 Rev. 5.2/May 01 HY29F400 Figure 1. Sector Protect Procedure 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 program- ming equipment. Sector unprotection re-enables the program and erase operations in previously protected sectors. Table 1 identifies the eleven sectors and the ad- dress range that each covers for both versions of the device. 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. The flow chart in Figure 1 illustrates the proce- dure for protecting sectors, and timing specifica- tions and waveforms are shown in the specifica- tions section of this document. Verification of pro- tection is accomplished as described in the Elec- tronic ID Mode section and shown in the flow chart. START Set TRYCNT = 1 Set A[9] = OE# = V ID Set Address: A[17:12] = Sector to Protect CE# = V IL RESET# = V IH WE# = V IL Wait t WPP1 A[9] = V ID A[17:12] = Sector to Protect OE# = CE# = V IL A[6] = A[0] = V IL , A[1] = 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 A[9] SECTOR PROTECT COMPLETE APPLY V CC WE# = V IH |
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