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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AM29LV800BB80EE 데이터시트(PDF) 12 Page - Advanced Micro Devices |
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AM29LV800BB80EE 데이터시트(HTML) 12 Page - Advanced Micro Devices |
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12 / 42 page  12 Am29LV800B P R E L I M I NARY Table 4. Am29LV800B 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 can be implemented via two methods. The primary method requires VID on the RESET# pin only, and can be implemented either in-system or via programming equipment. Figure 2 shows the algo- rithms and Figure 23 shows the timing diagram. This method uses standard microprocessor bus cycle tim- ing. For sector unprotect, all unprotected sectors must first be protected prior to the first sector unprotect write cycle. The alternate method intended only for programming 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. Pub- lication number 20536 contains further details; 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 22 shows the timing diagrams, 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 XLX L L X 01h Device ID: Am29LV800B (Top Boot Block) Word L L H XX VID XLX L H 22h DAh Byte L L H X DAh Device ID: Am29LV800B (Bottom Boot Block) Word L L H XX VID XLX L H 22h 5Bh Byte L L H X 5Bh 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. 21490E-5 |
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