전자부품 데이터시트 검색엔진 |
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AM29F800BB-55SEB 데이터시트(PDF) 11 Page - Advanced Micro Devices |
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AM29F800BB-55SEB 데이터시트(HTML) 11 Page - Advanced Micro Devices |
11 / 39 page Am29F800B 11 P R E L I M I NARY Table 4. Am29F800B Autoselect Codes (High Voltage Method) L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care. 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 20374. 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 diagram shows the timing waveforms, for this feature. Figure 1. Temporary Sector Unprotect Operation Description Mode CE# OE# WE# A18 to A12 A11 to A10 A9 A8 to A7 A6 A5 to A2 A1 A0 DQ8 to DQ15 DQ7 to DQ0 Manufacturer ID: AMD L L H X X VID XLXL L X 01h Device ID: Am29F800B (Top Boot Block) Word L L H XX VID XLXL H 22h D6h Byte L L H X D6h Device ID: Am29F800B (Bottom Boot Block) Word L L H XX VID XLXL H 22h 58h Byte L L H X 58h Sector Protection Verification L L H SA X VID XLX H L X 01h (protected) X 00h (unprotected) 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. 21504C-5 |
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