參數(shù)資料
型號： 29F004T-90
廠商： Macronix International Co., Ltd.
英文描述： 4M-BIT [512KX8] CMOS FLASH MEMORY
中文描述： 4分位[512KX8]的CMOS閃存
文件頁數(shù)： 13/39頁
文件大小： 599K
代理商： 29F004T-90
13
MX29F004T/B
P/N:PM0554
REV. 1.9, OCT. 19, 2004
CHIP PROTECTION WITH 12V SYSTEM
The MX29F004T/B features chip protection, which will
disable both program and erase operations. To activate
this mode, the programming equipment must force VID
on address pin A9 and control pin OE, (suggest VID=12V)
A6=VIL and CE=VIL.(see Table 2) Programming of the
protection circuitry begins on the falling edge of the WE
or CE, whichever happens later pulse and is terminated
on the rising edge. Please refer to chip protect algo-
rithm and waveform.
To verify programming of the protection circuitry, the pro-
gramming equipment must force VID on address pin A9
( with CE and OE at VIL and WE at VIH). When A1=1, it
will produce a logical "1" code at device output Q0 for
the protected status. Otherwise the device will produce
00H for the unprotected status. In this mode, the ad-
dresses, except for A1, are don't care. Address loca-
tions with A1 = VIL are reserved to read manufacturer
and device codes. (Read Silicon ID)
It is also possible to determine if chip is protected in the
system by writing a Read Silicon ID command. Per-
forming a read operation with A1=VIH, it will produce a
logical "1" at Q0 for the protected status.
CHIP UNPROTECT WITH 12V SYSTEM
The MX29F004T/B also features the chip unprotect mode,
so that all sectors are unprotected after chip unprotect
is completed to incorporate any changes in the code.
To activate this mode, the programming equipment must
force VID on control pin OE and address pin A9. The CE
pins must be set at VIL. Pins A6 must be set to VIH.
(see Table 2) Refer to chip unprotect algorithm and
waveform for the chip unprotect algorithm. The
unprotection mechanism begins on the falling edge of
the WE or CE, whichever happens later pulse and is
terminated on the rising edge.
It is also possible to determine if the chip is unprotected
in the system by writing the Read Silicon ID command.
Performing a read operation with A1=VIH, it will produce
00H at data outputs(Q0-Q7) for an unprotected sector. It
is noted that all sectors are unprotected after the chip
unprotect algorithm is completed.
POWER-UP SEQUENCE
The MX29F004T/B powers up in the Read only mode. In
addition, the memory contents may only be altered after
successful completion of the predefined command se-
quences.
CHIP PROTECTION WITHOUT 12V SYSTEM
The MX29F004T/B also feature a chip protection method
in a system without 12V power supply. The programming
equipment do not need to supply 12 volts to protect all
sectors. The details are shown in chip protect algorithm
and waveform.
CHIP UNPROTECT WITHOUT 12V SYSTEM
The MX29F004T/B also feature a chip unprotection
method in a system without 12V power supply. The pro-
gramming equipment do not need to supply 12 volts to
unprotect all sectors. The details are shown in chip
unprotect algorithm and waveform.
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