參數(shù)資料
型號(hào)： MBM29LV080A-12PTV
廠商： FUJITSU LTD
元件分類(lèi)： DRAM
英文描述： 8M (1M x 8) BIT
中文描述： 1M X 8 FLASH 3V PROM, 120 ns, PDSO40
封裝： PLASTIC, TSOP1-40
文件頁(yè)數(shù)： 11/49頁(yè)
文件大?。?/td> 400K
代理商： MBM29LV080A-12PTV
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 V
IL
, while CE is at V
IL
and OE is at V
IH
. 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 V
ID
on address pin A
9
and control pin OE, (suggest
V
ID
= 11.5 V), CE = V
IL
, A
0
= A
6
= V
IL
, and A
1
= V
IH
. The sector addresses (A
19
, A
18
, A
17
,and A
16
) 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 V
ID
on address pin A
9
with CE and OE at V
IL
and WE at V
IH
. Scanning the sector addresses (A
19
, A
18
, A
17
,and A
16
) while (A
10
, A
6
, A
1
,
A
0
) = (0, 0, 1, 0) will produce a logical “1” code at device output DQ
0
for a protected sector. Otherwise the devices
will read 00H for unprotected sector. In this mode, the lower order addresses, except for A
0
, A
1
, A
6
, and A
10
are
DON’T CARES. Address locations with A
1
= V
IL
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 (A
19
, A
18
, A
17
,and A
16
). are
the sector address will produce a logical “1” at DQ
0
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.
相關(guān)PDF資料
PDF描述
MBM29LV080A-70 8M (1M x 8) BIT
MBM29LV080A-90 8M (1M x 8) BIT
MBM29LV160BE 16M (2M X 8/1M X 16) BIT
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MBM29LV160BE12PCV 16M (2M X 8/1M X 16) BIT
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MBM29LV080A-70 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:8M (1M x 8) BIT
MBM29LV080A-70PTR 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:8M (1M x 8) BIT
MBM29LV080A-70PTV 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:8M (1M x 8) BIT
MBM29LV080A-90 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:8M (1M x 8) BIT
MBM29LV080A-90PTR 制造商:FUJITSU 制造商全稱(chēng):Fujitsu Component Limited. 功能描述:8M (1M x 8) BIT
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