M29DW128F60NF1 STMICROELECTRONICS [STMicroelectronics], M29DW128F60NF1 Datasheet - Page 41

• Manufacturer Part Number: M29DW128F60NF1
• Description: 128 Mbit (16Mb x8 or 8Mb x16, Multiple Bank, Page, Boot Block) 3V Supply, Flash Memory
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

M29DW128F
6.3.13 Verify Non-Volatile Modify Protection Bit command
6.3.14 Clear Non-Volatile Modify Protection Bits command
6.3.15 Set Lock Bit command
6.3.16 Clear Lock Bit command
6.3.17 Verify Lock Bit command
6.3.18 Set Lock-Down Bit command
6.3.19 Verify Lock-Down Bit command
The status of a Non-Volatile Modify Protection bit for a given block or group of blocks can be
read by issuing a Verify Non-Volatile Modify Protection Bit command along with the block
address.
This command is used to clear all Non-Volatile Modify Protection bits. No specific block address
is required. If the Lock-Down bit is set to ‘1’, the command will fail.
Six cycles are required to issue a Clear Non-Volatile Modify Protection Bits command:
1.
2.
3.
There must be a 12ms delay between the fourth and fifth cycles.
The Set Lock Bit command individually sets the Lock bit to ‘1’ for a given block or group of
blocks.
If the Non-Volatile Lock bit for the same block or group of blocks is set, the block is locked
regardless of the value of the Lock bit. (see
The Clear Lock Bit command individually clears (sets to ‘0’) the Lock Bit for a given block or
group of blocks.
If the Non-Volatile Lock bit for the same block or group of blocks is set, the block or group of
blocks remains locked (see
The status of a Lock bit for a given block can be read by issuing a Verify Lock Bit command
along with the block address.
This command is used to set the Lock-Down bit to ‘1’ thus protecting the Non-Volatile Modify
Protection bits from program and erase.
There is no Unprotect Lock-Down Bit command.
This command is used to read the status of the Lock-Down bit. The status is output on bit DQ1.
If DQ1 is ‘1’, all the Non-Volatile Modify Protection bits are protected from program or erase
operations.
The first two cycles are unlock cycles.
The third cycle issues the command.
The last three cycles verify if the operation has been successful. If DQ0 is set to ’0’, all
Non-Volatile Modify Protection bits have been successfully cleared. If DQ0 is ‘1’, the
operation has failed and the command must be re-issued.
Table 10: Block Protection
Table 10: Block Protection
Status).
Status).
6 Command Interface
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