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AM29LV008B-90FIB Datasheet(PDF) 9 Page - Advanced Micro Devices |
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AM29LV008B-90FIB Datasheet(HTML) 9 Page - Advanced Micro Devices |
9 / 39 page Am29LV008T/Am29LV008B 9 PRELIMINARY Autoselect The Autoselect mode allows the reading out of a binary code from the device and will identify its manufacturer and type. The intent is to allow programming equipment to automatically match the device to be programmed with its corresponding programming algorithm. The Au- toselect command may also be used to check the sta- tus of write-protected sectors (see Table 2). This mode is functional over the entire temperature range of the device. To activate this mode, the programming equipment must force VID (12.0 V ± 5%) on address pin A9. Two identifier bytes may then be sequenced from the device outputs by toggling address A0 from VIL to VIH. All ad- dresses are don’t cares except A0, A1, and A6 see Table 2. The manufacturer and device codes may also be read via the command register, for instances when the Am29LV008 is erased or programmed in a system with- out access to high voltage on the A9 pin. The command sequence is illustrated in Table 5 on page 13. Byte 0 (A0 = VIL) represents the manufacturer’s code and byte 1 (A0 = VIH) the device identifier code. For the Am29LV008 these two bytes are given in Table 2. All identifiers for manufacturer and device will exhibit odd parity with DQ7 defined as the parity bit. In order to read the proper device codes when executing Autose- lect, A1 must be VIL (see Table 2). The device code is 3EH (for top boot block) or 37H (for bottom boot block). In order to determine which sectors are write protected, A1 must be at VIH while running through the sector ad- dresses; if the selected sector is protected, a logical ‘1’ will be output on DQ0 (DQ0 = 1). Table 2. Autoselect/Sector Protection Codes X = Don’t care. * Outputs 01H at protected sector addresses. Type A13–A19 A6 A1 A0 Code (HEX) DQ 7 DQ 6 DQ 5 DQ 4 DQ 3 DQ 2 DQ 1 DQ 0 Manufacturer Code: AMD X L L L 01H 00000001 29LV008 Device (Top Boot Block) X L L H 3EH 00111110 29LV008 Device (Bottom Boot Block) X L L H 37H 00110111 Sector Protection Set Sector Addresses L H L 01H* 00000001 |
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