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MBM29LV017-80PBT-SF2 Datasheet(PDF) 11 Page - Fujitsu Component Limited. |
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MBM29LV017-80PBT-SF2 Datasheet(HTML) 11 Page - Fujitsu Component Limited. |
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11 / 52 page  11 MBM29LV017-80/-90/-12 The manufacturer and device codes may also be read via the command register, for instances when the MBM29LV017 is erased or programmed in a system without access to high voltage on the A9 pin. The command sequence is illustrated in Table 6. (Refer to Autoselect Command section.) Byte 0 (A0 = VIL) represents the manufacture’s code (Fujitsu = 04H) and byte 1 (A0 = VIH) represents the device identifier code MBM29LV017 = C8H. All identifiers for manufactures and device will exhibit odd parity with DQ7 defined as the parity bit. In order to read the proper device codes when executing the autoselect, A1 must be VIL. (See Tables 3.1 and 3.2.) In order to determine which sectors are write protected, A1 must be at VIH while running through the sector addresses; if the selected sector is protected, a logical ‘1’ will be output on DQ0 (DQ0 = 1). *1: Outputs 01H at protected sector addresses and outputs 00H at unprotected sector addresses. Table 3.1 MBM29LV017 Sector Protection Verify Autoselect Code Type A16 to A20 A10 A6 A1 A0 Code (HEX) Manufacture’s Code X VIL VIL VIL VIL 04H Device Code MBM29LV017 X VIL VIL VIL VIH C8H Sector Protection Sector Addresses VIL VIL VIH VIL 01H*1 Table 3.2 Expanded Autoselect Code Table Type Code DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 Manufacture’s Code 04H 00000100 Device Code MBM29LV017 C8H 11001000 Sector Protection 01H 00000001 |
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