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AM29F400BB-60EE 数据表(PDF) 10 Page - Advanced Micro Devices |
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AM29F400BB-60EE 数据表(HTML) 10 Page - Advanced Micro Devices |
10 / 37 page 10 Am29F400B PREL I M I N AR Y Table 4. Am29F400B 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 pro- gram and erase operations in any sector. The hardware sector unprotection feature re-enables both program and erase operations in previously protected sectors. Sector protection/unprotection must be implemented using programming equipment. The procedure re- quires a high voltage (VID) on address pin A9 and OE#. Details on this method are provided in a supplement, publication number 20185. Contact an AMD represent- ative to obtain a copy of this 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 RE- SET# pin to VID. During this mode, formerly protected sectors can be programmed or erased by selecting the sector addresses. Once VID is removed from the RE- SET# pin, all the previously protected sectors are protected again. Figure 1 shows the algorithm, and Figure 18 shows the timing diagrams, for this feature. Figure 1. Temporary Sector Unprotect Operation Hardware Data Protection The command sequence requirement of unlock cycles for programming or erasing provides data protection against inadvertent writes (refer to Table 5 for com- mand definitions). In addition, the following hardware data protection measures prevent accidental erasure or programming, which might otherwise be caused by Description Mode CE# OE# WE# A17 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 XLX L L X 01h Device ID: Am29F400B (Top Boot Block) Word L L H XX VID XLX L H 22h 23h Byte L L H X 23h Device ID: Am29F400B (Bottom Boot Block) Word L L H XX VID XLX L H 22h ABh Byte L L H X ABh 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. 21505C-5 |
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