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M29DW640F90N6E Datasheet(PDF) 28 Page - Numonyx B.V |
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M29DW640F90N6E Datasheet(HTML) 28 Page - Numonyx B.V |
28 / 74 page Command interface M29DW640F 28/74 When VPP is applied to the VPP/Write Protect pin the memory automatically enters the Unlock Bypass mode and the Unlock Bypass Program command can be issued immediately. 4.2.7 Unlock Bypass Program command The Unlock Bypass Program command can be used to program one address in the memory array at a time. The command requires two Bus Write operations, the final write operation latches the address and data in the internal state machine and starts the Program/Erase Controller. The Program operation using the Unlock Bypass Program command behaves identically to the Program operation using the Program command. The operation cannot be aborted, a Bus Read operation to the Bank where the command was issued outputs the Status Register. See the Program command for details on the behavior. 4.2.8 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. 4.3 Block Protection commands 4.3.1 Enter Extended Block command The M29DW640F has one 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 Program operations to the 000000h-00007Fh (Word) or 000000h-0000FFh (Byte) addresses access the Extended Block. The Extended Block cannot be erased, and can be treated as one-time programmable (OTP) memory. In Extended Block mode only array cell locations (Bank A) with the same addresses as the Extended Block (000000h-00007Fh (Word) or 000000h-0000FFh (Byte)) are not accessible. In Extended Block mode dual operations are allowed and the Extended Block physically belongs to Bank A. When in Extended Block mode, Erase, Chip Erase, Erase Suspend and Erase resume commands are not allowed. 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. 4.3.2 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. |
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