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MBM29LV008BA-12PTN 参数 Datasheet PDF下载

MBM29LV008BA-12PTN图片预览
型号: MBM29LV008BA-12PTN
PDF下载: 下载PDF文件 查看货源
内容描述: 8M ( 1M ×8 )位 [8M (1M X 8) BIT]
分类和应用: 内存集成电路光电二极管
文件页数/大小: 51 页 / 419 K
品牌: FUJITSU [ FUJITSU ]
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MBM29LV008TA-70/-90/-12/MBM29LV008BA-70/-90/-12  
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  
command 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 MBM29LV008TA/BA feature hardware sector protection. This feature will disable both program and erase  
operations in any number of sectors (0 through 18). The sector protection feature is enabled using programming  
equipment at the user’s site. The devices are shipped with all sectors unprotected. Alternatively, Fujitsu may  
program and protect sectors in the factory prior to shiping the device.  
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, and A6 = VIL. The sector addresses (A19, A18, A17, A16, A15, A14, and A13) should be set to  
the sector to be protected. Tables 4 and 5 define the sector address for each of the nineteen (19) 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, A16, A15, A14, and A13) 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.  
ItisalsopossibletodetermineifasectorisprotectedinthesystembywritinganAutoselectcommand. Performing  
a read operation at the address location XX02H, where the higher order addresses (A19, A18, A17, A16, A15, A14,  
and A13) are the desired 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 MBM29LV008TA/BA devices  
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. See Figures 14 and 22.  
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