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參數(shù)資料
| 型號： | 29F016-90 |
| 廠商： | Macronix International Co., Ltd. |
| 英文描述： | 16M-BIT [2M X 8] CMOS EQUAL SECTOR FLASH MEMORY |
| 中文描述： | 1,600位[2米x 8]的CMOS平等部門閃存 |
| 文件頁數(shù)： | 13/37頁 |
| 文件大?。?/td> | 888K |
| 代理商： | 29F016-90 |
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13
P/N:PM0590
REV. 1.4, NOV. 21, 2002
MX29F016
SECTOR PROTECTION WITH 12V SYSTEM
The MX29F016 features hardware group sector protection.
This feature will disable both program and erase operations
for these group sector protected. 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 pulse and
is terminated on the rising edge. Please refer to group
sector protect algorithm and waveform.
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). When A1=1,
it will produce a logical "1" code at device output Q0 for
a protected sector. Otherwise the device will produce
00H for the unprotected sector. In this mode, the
addresses, except for A1, are don't care. Address
locations with A1 = VIL are reserved to read manufacturer
and device codes.(Read Silicon ID)
It is also possible to determine if the group is protected
in the system by writing a Read Silicon ID command.
Performing a read operation with A1=VIH, it will produce
a logical "1" at Q0 for the protected sector.
CHIP UNPROTECT WITH 12V SYSTEM
The MX29F016 also features the chip unprotect mode,
so that all sectors are unprotected after chip unprotect
is completed to incorporate any changes in the code. It
is recommended to protect all sectors before activating
chip unprotect mode.
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 pulse and is terminated on the rising edge.
It is also possible to determine if the chip is unprotected
POWER-UP SEQUENCE
The MX29F016 powers up in the Read only mode. In
addition, the memory contents may only be altered after
successful completion of the predefined command
sequences.
POWER SUPPLY DECOUPLING
In order to reduce power switching effect, each device
should have a 0.1uF ceramic capacitor connected
between its VCC and GND.
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.
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