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AM29LV800DB-120ED Datasheet(PDF) 16 Page - Advanced Micro Devices |
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AM29LV800DB-120ED Datasheet(HTML) 16 Page - Advanced Micro Devices |
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16 / 51 page  14 Am29LV800D Am29LV800D_00_A4_E January 21, 2005 PR EL IM IN A R Y Table 4. Am29LV800D 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 protected sectors. The device is shipped with all sectors unpro- tected. AMD offers the option of programming and protecting sectors at its factory prior to shipping the device through AMD’s Express- Flash™ 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 can be imple- mented via two methods. The primary method requires VID on the RESET# pin only, and can be implemented either in-system or via programming equip- ment. Figure 2 shows the algorithms and Figure 1 shows the timing diagram. This method uses standard microprocessor bus cycle timing. For sector unprotect, all unprotected sectors must first be protected prior to the first sector unpro- tect write cycle. The alternate method intended only for pro- gramming equipment requires VID on address pin A9 and OE#. This method is compatible with programmer routines written for earlier 3.0 volt- only AMD flash devices. Publication number 20536 contains further details; contact an AMD representative to request a copy. Temporary Sector Unprotect This feature allows temporary unprotection of previously protected sectors to change data in-system. The Sector Unprotect mode is acti- vated by setting the RESET# 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 RESET# pin, all the previously protected sectors are protected again. Figure 1 shows the algo- Description Mode CE# OE# WE # A1 8 to A1 2 A1 1 to A1 0 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 X L X L L X 01h Device ID: Am29LV800B (Top Boot Block) Word L L H X X VID X L X L H 22h DAh Byte L L H X DAh Device ID: Am29LV800B (Bottom Boot Block) Word L L H X X VID X L X L H 22h 5Bh Byte L L H X 5Bh Sector Protection Verification L L H SA X VID X L X H L X 01h (protected) X 00h (unprotecte d) |
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