IMX29F002 Macronix International, IMX29F002 Datasheet - Page 16

• Manufacturer Part Number: IMX29F002
• Description: 2M-BIT [256K x 8] CMOS FLASH MEMORY
• Manufacturer: Macronix International

CHIP UNPROTECT WITH 12V SYSTEM
The MX29F002T/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. 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.
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 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.
SECTOR PROTECTION WITHOUT 12V
SYSTEM
The MX29F002T/B also feature a hardware sector
protection method in a system without 12V power suppply.
The programming equipment do not need to supply 12
volts to protect sectors. The details are shown in sector
protect algorithm and waveform.
CHIP UNPROTECT WITHOUT 12V SYSTEM
The MX29F002T/B also feature a hardware chip
unprotection method in a system without 12V power
supply. The programming equipment do not need to
supply 12 volts to unprotect all sectors. The details are
shown in chip unprotect algorithm and waveform.
POWER-UP SEQUENCE
The MX29F002T/B powers up in the Read only mode. In
addition, the memory contents may only be altered after
successful completion of a two-step command sequence.
Vpp and Vcc power up sequence is not required.
P/N: PM0547
The unprotection
16
ABSOLUTE MAXIMUM RATINGS
NOTICE:
Stresses greater than those listed under ABSOLUTE MAXIMUM
RATINGS may cause permanent damage to the device. This is a stress
rating only and functional operational sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended
period may affect reliability.
NOTICE:
Specifications contained within the following tables are subject to
change.
RATING
Ambient Operating Temperature
Storage Temperature
Applied Input Voltage
Applied Output Voltage
VCC to Ground Potential
A9
MX29F002/002N
VALUE
0
-65
-0.5V to 7.0V
-0.5V to 7.0V
-0.5V to 7.0V
-0.5V to 13.5V
o
C to 70
o
REV. 1.1, JUN. 14, 2001
C to 125
o
C
o
C