M29W640FT70N6E Micron Technology Inc, M29W640FT70N6E Datasheet - Page 26

• Manufacturer Part Number: M29W640FT70N6E
• Manufacturer: Micron Technology Inc

Specifications of M29W640FT70N6E

• Cell Type: NOR
• Density: 64Mb
• Access Time (max): 70ns
• Interface Type: Parallel
• Boot Type: Top
• Address Bus: 23/22Bit
• Operating Supply Voltage (typ): 3/3.3V
• Operating Temp Range: -40C to 85C
• Package Type: TSOP
• Sync/async: Asynchronous
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (max): 3.6V
• Word Size: 8/16Bit
• Number Of Words: 8M/4M
• Supply Current: 10mA
• Mounting: Surface Mount
• Pin Count: 48
• Lead Free Status / Rohs Status: Compliant

4.2.8
4.3
4.3.1
4.3.2
4.3.3
26/71
Unlock Bypass Reset command
The Unlock Bypass Reset command can be used to return to Read/Reset mode from
Unlock Bypass Mode. Two Bus Write operations are required to issue the Unlock Bypass
Reset command. Read/Reset command does not exit from Unlock Bypass Mode.
Block Protection commands
Enter Extended Block command
The device has an extra 256 Byte block (Extended Block) that can only be accessed using
the Enter Extended Block command. Three Bus write cycles are required to issue the
Extended Block command. Once the command has been issued the device enters
Extended Block mode where all Bus Read or Write operations to the Boot Block addresses
access the Extended Block. The Extended Block (with the same address as the Boot
Blocks) cannot be erased, and can be treated as one-time programmable (OTP) memory. In
Extended Block mode the Boot Blocks are not accessible.
To exit from the Extended Block mode the Exit Extended Block command must be issued.
The Extended Block can be protected, however once protected the protection cannot be
undone.
Exit Extended Block command
The Exit Extended Block command is used to exit from the Extended Block mode and return
the device to Read mode. Four Bus Write operations are required to issue the command.
Block Protect and Chip Unprotect commands
Groups of blocks can be protected against accidental Program or Erase. The Protection
Groups are shown in
M29W640FT
can be unprotected to allow the data inside the blocks to be changed.
Block Protect and Chip Unprotect operations are described in
and
Table 22: Bottom Boot Block addresses,
Appendix A: Block
addresses,
Table 21: Top Boot Block addresses,
M29W640FB. The whole chip
Appendix D: Block
protection.