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AM29F100B-150EC Datasheet(PDF) 10 Page - Advanced Micro Devices |
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AM29F100B-150EC Datasheet(HTML) 10 Page - Advanced Micro Devices |
10 / 36 page 10 Am29F100 Sector Protection/Unprotection The hardware sector protection feature disables both program and erase operations in any sector. The hardware sector unprotection feature re-enables both program and erase operations in previously pro- tected sectors. Sector protection/unprotection must be implemented using programming equipment. The procedure re- quires a high voltage (VID) on address pin A9 and the control pins. Details on this method are provided in a supplement, publication number 20373. Contact an AMD representative to obtain a copy of the appropriate document. The device is shipped with all sectors unprotected. AMD offers the option of programming and protecting sectors at its factory prior to shipping the device through AMD’s ExpressFlash™ Service. Contact an AMD representative for details. It is possible to determine whether a sector is protected or unprotected. See “Autoselect Mode” for details. Temporary Sector Unprotect This feature allows temporary unprotection of previ- ously protected sectors to change data in-system. The Sector Unprotect mode is activated by setting the RESET# pin to VID. During this mode, formerly pro- tected sectors can be programmed or erased by se- lecting the sector addresses. Once VID is removed from the RESET# pin, all the previously protected sectors are protected again. Figure 1 shows the algo- rithm, and the Temporary Sector Unprotect (Figure 17) diagram shows the timing waveforms, for this fea- ture. Figure 1. Temporary Sector Unprotect Operation START Perform Erase or Program Operations RESET# = VIH Temporary Sector Unprotect Completed (Note 2) RESET# = VID (Note 1) Notes: 1. All protected sectors unprotected. 2. All previously protected sectors are protected once again. 18926C-6 |
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