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AM29LV002B-120FCB Fiches technique(PDF) 10 Page - Advanced Micro Devices |
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AM29LV002B-120FCB Fiches technique(HTML) 10 Page - Advanced Micro Devices |
10 / 34 page 10 Am29LV002 PR EL I M I NAR Y Table 4. Am29LV002 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. Sector protection/unprotection must be implemented usin g programmin g equip ment. The procedure requires a high voltage (VID) on address pin A9 and OE#. Details on this method are provided in a supple- ment, publication number 21224. Contact an AMD rep- resentative to request a copy. 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 19 shows the timing waveforms, for this feature. Figure 1. Temporary Sector Unprotect Operation Description CE# OE# WE# A17 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 X LXL L 01h Device ID: Am29LV002T (Top Boot Block) LL H X X VID X LXLH 40h Device ID: Am29LV002B (Bottom Boot Block) LL H X X VID X LXLH C2h Sector Protection Verification L L H SA X VID XL X 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. 21191C-4 |
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Description similaire - AM29LV002B-120FCB |
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