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M29DW641F Datasheet(PDF) 35 Page - Numonyx B.V |
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M29DW641F Datasheet(HTML) 35 Page - Numonyx B.V |
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35 / 80 page  M29DW641F Command interface 35/80 6.3.7 Password Protection Unlock command The Password Protection Unlock command is used to clear the Lock-Down bit in order to unprotect all Non-Volatile Modify Protection bits when the device is in Password Protection mode. The Password Protection Unlock command must be issued along with the correct Password. The complete command sequence must be entered for each 16 bits of the Password. There must be a 2µs delay between successive Password Protection 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. 6.3.8 Set Password Protection mode command The Set Password Protection mode command puts the device in Password Protection mode by programming the Password Protection mode Lock bit to ‘1’. This command can be issued either with the Reset/Block Temporary Unprotect pin, RP, at VID or at VIH. Six cycles are required to issue a Set Password Protection mode command: 1. The first two cycles are unlock cycles. 2. The third cycle issues the command. 3. The fourth and fifth cycles select the address (see Table 11: Protection command addresses). 4. The last cycle verifies if the operation has been successful. If DQ0 is set to ’1’, the device has successfully entered the Password Protection mode. If DQ0 is ‘0’, the operation has failed and the command must be re-issued. There must be a 100µs delay between the fourth and fifth cycles. Once the Password Protection mode is activated the device will permanently remain in this mode. 6.3.9 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. 6.3.10 Set Standard Protection mode command 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. The first two cycles are unlock cycles. 2. The third cycle issues the program command. 3. The fourth and fifth cycles select the address (see Table 11: Protection command addresses). 4. 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. 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. |
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