Command interface
M29W128GH, M29W128GL
6.3.6
NVPB Lock Bit command set
Enter NVPB Lock Bit Command Set command
Three bus Write cycles are required to issue the Enter NVPB Lock Bit Command Set
command. Once the command has been issued, the commands allowing to set the NVPB
Lock bit can be issued to the device.
NVPB Lock Bit Program command
This command is used to set the NVPB Lock bit to ‘0’ thus locking the NVPBs, and
preventing them from being modified.
Read NVPB Lock Bit Status command
This command is used to read the status of the NVPB Lock bit.
6.3.7
Volatile Protection mode command set
Enter Volatile Protection Command Set command
Three bus Write cycles are required to issue the Enter Volatile Protection Command Set
command. Once the command has been issued, the commands related to the Volatile
Protection mode can be issued to the device.
Volatile Protection Bit Program command (VPB Program)
The VPB Program command individually sets a VPB to ‘0’ for a given block.
If the NVPB for the same block is set, the block is locked regardless of the value of the VPB
bit. (see Table 19: Block protection status).
Read VPB Status command
The status of a VPB for a given block can be read by issuing a Read VPB Status command
along with the block address.
VPB Clear command
The VPB Clear command individually clears (sets to ‘1’) the VPB for a given block.
If the NVPB for the same block is set, the block is locked regardless of the value of the VPB
bit. (see Table 19: Block protection status).
6.3.8
Exit Protection command set
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 return the device to Read mode.
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