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AM29LV004B-100ECB Datenblatt(PDF) 10 Page - Advanced Micro Devices |
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AM29LV004B-100ECB Datenblatt(HTML) 10 Page - Advanced Micro Devices |
10 / 36 page 10 Am29LV004 PR EL I M I NAR Y Table 4. Am29LV004 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 hard- ware sector unprotection feature re-enables both pro- gram and erase operations in previously protected sectors. 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. Sector protection/unprotection must be implemented using programming equipment.The procedure requires a high voltage (VID) on address pin A9 and OE#. De- tails on this method are provided in a supplement, pub- lication number 20874. Contact an AMD representative to request a copy. 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 19 shows the timing diagrams, for this feature. Description CE# OE# WE# A18 to A13 A12 to A10 A9 A8 to A7 A6 A5 to A2 A1 A0 DQ7 to DQ0 Manufacturer ID: AMD L L H X X VID XLXL L 01h Device ID: Am29LV004T (Top Boot Block) LL H X X VID XLXL H B5h Device ID: Am29LV004B (Bottom Boot Block) LL H X X VID XLXL H B6h Sector Protection Verification L L H SA X VID XLX H L 01h (protected) 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. Figure 1. Temporary Sector Unprotect Operation 21522A-4 |
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