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MBM29F400TC-55PFTN 参数 Datasheet PDF下载

MBM29F400TC-55PFTN图片预览
型号: MBM29F400TC-55PFTN
PDF下载: 下载PDF文件 查看货源
内容描述: 4M ( 512K ×8 / 256K ×16 )位 [4M (512K X 8/256K X 16) BIT]
分类和应用: 闪存存储内存集成电路光电二极管
文件页数/大小: 47 页 / 522 K
品牌: FUJITSU [ FUJITSU ]
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MBM29F400TC-55/-70/-90/MBM29F400BC-55/-70/-90  
To activate this mode, the programming equipment must force VID on address pin A9 and control pin OE, (suggest  
VID = 11.5V), CE = VIL, and A6 = VIL. The sector addresses (A17, A16, A15, A14, A13, and A12) should be set to the  
sector to be protected. Tables 5 and 6 define the sector address for each of the eleven (11) 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. Refer to Figures 16 and  
23 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 (A17, A16, A15, A14, A13, and A12) while (A6,  
A1, A0) = (0, 1, 0) will produce a logical “1” code at device output DQ0 for a protected sector. Otherwise the  
devices will produce 00H for unprotected sector. In this mode, the lower order addresses, except for A0, A1, and  
A6 are don't care. Address locations with A1 = VIL are reserved for Autoselect manufacturer and device codes.  
A-1 requires to apply to VIL on byte mode.  
ItisalsopossibletodetermineifasectorisprotectedinthesystembywritinganAutoselectcommand. Performing  
a read operation at the address location XX02H, where the higher order addresses (A17, A16, A15, A14, A13, and  
A12) are the desired sector address will produce a logical “1” at DQ0 for a protected sector. See Tables 4.1 and  
4.2 for Autoselect codes.  
Temporary Sector Unprotection  
This feature allows temporary unprotection of previously protected sectors of the MBM29F400TC/BC 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 RESETpin, all the previously protected sectors will be protected  
again. Refer to Figures 17 and 24.  
12  
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