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AM29LV160DT-70EC Datasheet(PDF) 15 Page - Advanced Micro Devices |
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AM29LV160DT-70EC Datasheet(HTML) 15 Page - Advanced Micro Devices |
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15 / 50 page  14 Am29LV160D 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 9. This method does not require VID. See “Command Definitions” for details on using the autoselect mode. Table 4. Am29LV160D Autoselect Codes (High Voltage Method) L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care. Note: The autoselect codes may also be accessed in-system via command sequences. See Table 9. 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. De- tails on this method are provided in a supplement, pub- lication number 21468. Contact an AMD representative to request a copy. Description Mode CE# OE# WE# A19 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 XLXL L X 01h Device ID: Am29LV160D (Top Boot Block) Word L L H XX VID XLXL H 22h C4h Byte L L H X C4h Device ID: Am29LV160D (Bottom Boot Block) Word L L H XX VID XLXL H 22h 49h Byte L L H X 49h Sector Protection Verification L L H SA X VID XLX H L X 01h (protected) X 00h (unprotected) |
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