MX29LV004B Ver la hoja de datos (PDF) - Macronix International

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MX29LV004B

4M-BIT [512K x 8] CMOS SINGLE VOLTAGE 3V ONLY FLASH MEMORY

Macronix International 

CHIP UNPROTECT

The MX29LV004T/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. 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

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.

MX29LV004T/B

P/N:PM0732

REV. 1.1, SEP. 19, 2001

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