M29DW128F60NF1 STMICROELECTRONICS [STMicroelectronics], M29DW128F60NF1 Datasheet - Page 40

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M29DW128F60NF1

Manufacturer Part Number
M29DW128F60NF1
Description
128 Mbit (16Mb x8 or 8Mb x16, Multiple Bank, Page, Boot Block) 3V Supply, Flash Memory
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
6 Command Interface
6.3.9
6.3.10 Set Standard Protection Mode command
6.3.11 Verify Standard Protection Mode command
6.3.12 Set Non-Volatile Modify Protection Bit command
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Once the Password Protection mode is activated the device will permanently remain in this
mode.
Verify Password Protection Mode command
The Verify Password Protection Mode command reads the status of the Password Protection
Mode Lock Bit. If it is ‘1’, the device is in Password Protection mode.
The Set Standard Protection Mode command puts the device in Standard Protection mode by
programming the Standard Protection Mode Lock bit to ‘1’.
Six cycles are required to issue the Standard Protection Mode command:
1.
2.
3.
4.
There must be a 100µs delay between the fourth and fifth cycles.
Once the Standard Protection mode is activated the device will permanently remain in this
mode.
The Verify Standard Protection Mode command reads the status of the Standard Protection
Mode Lock Bit. If it is ‘1’, the device is in Standard Protection mode.
A block or group of blocks can be protected from program or erase by issuing a Set Non-Volatile
Modify Protection Bit command along with the block address. This command sets the Non-
Volatile Modify Protection bit to ‘1’ for a given block or group of blocks.
Six cycles are required to issue the command:
1.
2.
3.
4.
There must be a 100µs delay between the fourth and fifth cycles.
The Non-Volatile Modify Protection bits are erased simultaneously by issuing a Clear Non-
Volatile Modify Protection Bits command except if the Lock-Down bit is set to ‘1’.
The Non-Volatile Modify Protection bits can be set a maximum of 100 times.
The first two cycles are unlock cycles.
The third cycle issues the program command.
The fourth and fifth cycles select the address (see
Addresses).
The last cycle verifies if the operation has been successful. If DQ0 is set to ’1’, the
Standard Protection Mode has been successfully activated. If DQ0 is ‘0’, the operation has
failed and the command must be re-issued.
The first two cycles are unlock cycles.
The third cycle issues the program command.
The fourth and fifth cycles select the address (see
Addresses).
The last cycle verifies if the operation has been successful. If DQ0 is set to ’1’, the Non-
Volatile Modify Protection bit has been successfully programmed. If DQ0 is ‘0’, the
operation has failed and the command must be re-issued.
Table 17: Protection Command
Table 17: Protection Command
M29DW128F

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