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MBM29LV080A-70PTR Datasheet(PDF) 11 Page - Fujitsu Component Limited. |
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MBM29LV080A-70PTR Datasheet(HTML) 11 Page - Fujitsu Component Limited. |
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11 / 49 page  MBM29LV080A-70/-90/-12 11 Write Device erasure and programming are accomplished via the command register. The contents of the register serve as inputs to the internal state machine. The state machine outputs dictate the function of the device. The command register itself does not occupy any addressable memory location. The register is a latch used to store the commands, along with the address and data information needed to execute the command. The com- mand register is written by bringing WE to VIL, while CE is at VIL and OE is at VIH. Addresses are latched on the falling edge of WE or CE, whichever happens later; while data is latched on the rising edge of WE or CE, whichever happens first. Standard microprocessor write timings are used. Refer to AC Write Characteristics and the Erase/Programming Waveforms for specific timing parameters. Sector Protection The MBM29LV080A features hardware sector protection. This feature will disable both program and erase operations in any number of sectors (0 through 15). The sector protection feature is enabled using programming equipment at the user’s site. The device is shipped with all sectors unprotected. To activate this mode, the programming equipment must force VID on address pin A9 and control pin OE, (suggest VID = 11.5 V), CE = VIL, A0 = A6 = VIL, and A1 = VIH. The sector addresses (A19, A18, A17,and A16) should be set to the sector to be protected. Tables 4 and 5 define the sector address for each of the sixteen (16) individual sectors. Programming of the protection circuitry begins on the falling edge of the WE pulse and is terminated with the rising edge of the same. Sector addresses must be held constant during the WE pulse. See figures 13 and 21 for sector protection waveforms and algorithm. To verify programming of the protection circuitry, the programming equipment must force VID on address pin A9 with CE and OE at VIL and WE at VIH. Scanning the sector addresses (A19, A18, A17,and A16) while (A10, A6, A1, A0) = (0, 0, 1, 0) will produce a logical “1” code at device output DQ0 for a protected sector. Otherwise the devices will read 00H for unprotected sector. In this mode, the lower order addresses, except for A0, A1, A6, and A10 are DON’T CARES. Address locations with A1 = VIL are reserved for Autoselect manufacturer and device codes. It is also possible to determine if a sector is protected in the system by writing an Autoselect command. Performing a read operation at the address location XX02H, where the higher order addresses (A19, A18, A17,and A16). are the sector address will produce a logical “1” at DQ0 for a protected sector. See Tables 3.1 and 3.2 for Autoselect codes. Temporary Sector Unprotection This feature allows temporary unprotection of previously protected sectors of the MBM29LV080A device in order to change data. The Sector Unprotection mode is activated by setting the RESET pin to high voltage (12 V). During this mode, formerly protected sectors can be programmed or erased by selecting the sector addresses. Once the 12 V is taken away from the RESET pin, all the previously protected sectors will be protected again. See figure 15 and 22. |
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