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AM29LV400T-90REEB Datasheet(PDF) 11 Page - Advanced Micro Devices |
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AM29LV400T-90REEB Datasheet(HTML) 11 Page - Advanced Micro Devices |
11 / 40 page 11 Am29LV400 PR EL IMIN AR Y Autoselect Mode The autoselect mode provides manufacturer and de- vice identification, and sector protection verification, through identifier codes output on DQ7–DQ0. This mode is primarily intended for programming equipment to automatically match a device to be programmed with its corresponding programming algorithm. However, the autoselect codes can also be accessed in-system through the command register. When using programming equipment, the autoselect mode requires VID (11.5 V to 12.5 V) on address pin A9. Address pins A6, A1, and A0 must be as shown in Table 4. In addition, when verifying sector protection, the sector address must appear on the appropriate highest order address bits (see Tables 2 and 3). Table 4 shows the remaining address bits that are don’t care. When all necessary bits have been set as required, the programming equipment may then read the corre- sponding identifier code on DQ7–DQ0. To access the autoselect codes in-system, the host system can issue the autoselect command via the command register, as shown in Table 5. This method does not require VID. See “Command Definitions” for details on using the autoselect mode. Table 4. Am29LV400 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 is implemented using programming equipment, and requires VID on address pin A9 and OE#. Publication number 20873 contains further details; contact an AMD representative to re- quest 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 21 shows the timing diagrams, for this feature. 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: Am29LV400 (Top Boot Block) Word L L H XX VID XLX L H 22h B9h Byte L L H X B9h Device ID: Am29LV400 (Bottom Boot Block) Word L L H XX VID XLX L H 22h BAh Byte L L H X BAh Sector Protection Verification L L H SA X VID XLX H L X 01h (protected) X 00h (unprotected) |
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