M29W256GH7AN6E NUMONYX, M29W256GH7AN6E Datasheet - Page 48

• Manufacturer Part Number: M29W256GH7AN6E
• Description: Flash Mem Parallel 3V/3.3V 256M-Bit 32M x 8/16M x 16 70ns 56-Pin TSOP Tray
• Manufacturer: NUMONYX

Specifications of M29W256GH7AN6E

• Package: 56TSOP
• Cell Type: NOR
• Density: 256 Mb
• Architecture: Sectored
• Block Organization: Symmetrical
• Location Of Boot Block: Bottom|Top
• Typical Operating Supply Voltage: 3|3.3 V
• Sector Size: 128KByte x 256
• Timing Type: Asynchronous
• Operating Temperature: -40 to 85 °C
• Interface Type: Parallel

6.4.7
48/97
To verify the 64-bit password, the complete command sequence must be entered eight
times at eight consecutive addresses selected by A1-A0 plus DQ15A-1 in 8-bit mode, or
four times at four consecutive addresses selected by A1-A0 in 16-bit mode.
If the password mode lock bit is programmed and the user attempts to read the password,
the device will output FFh onto the I/O data bus.
An Exit Protection Command Set command must be issued to return the device to read
mode.
Password Unlock command
The Password Unlock command is used to clear the NVPB lock bit allowing to modify the
NVPBs.
The Password Unlock command must be issued along with the correct password.
There must be a 1 µs delay between successive password unlock commands in order to
prevent hackers from cracking the password by trying all possible 64-bit combinations. If
this delay is not respected, the latest command will be ignored.
Approximately 1 µs is required for unlocking the device after the valid 64-bit password has
been provided.
Exit Protection Command Set command
The Exit Protection Command Set command is used to exit from the lock register, password
protection, non-volatile protection, volatile protection, and NVPB lock bit command set
mode. It returns the device to read mode.