S29GL512N SPANSION, S29GL512N Datasheet - Page 64

• Manufacturer Part Number: S29GL512N
• Description: Page Mode Flash Memory
• Manufacturer: SPANSION

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Volatile Sector Protection Command Set
Secured Silicon Sector Entry Command
Secured Silicon Sector Exit Command
The Volatile Sector Protection Command Set permits the user to set the Dynamic Protection
Bit (DYB) to the protected state, clear the Dynamic Protection Bit (DYB) to the unprotected
state, and read the logic state of the Dynamic Protection Bit (DYB).
The Volatile Sector Protection Command Set Entry command sequence must be issued
prior to any of the commands listed following to enable proper command execution.
Note that issuing the Volatile Sector Protection Command Set Entry command disables
reads and writes from main memory.
The DYB Set and DYB Clear commands are used to protect or unprotect a given sector. The
high order address bits are issued at the same time as the code 00h or 01h on DQ7-DQ0. All
other DQ data bus pins are ignored during the data write cycle. The DYB bits are modifiable
at any time, regardless of the state of the PPB bit or PPB Lock Bit. The DYB bits are cleared
to the unprotected state at power-up or hardware reset.
The programming state of the DYB bit for a given sector can be verified by writing a DYB Sta-
tus Read command to the device. This requires an initial access delay.
The Volatile Sector Protection Command Set Exit command must be issued after the ex-
ecution of the commands listed previously to reset the device to read mode.
Note that issuing the Volatile Sector Protection Command Set Exit command re-en-
ables reads and writes to the main memory.
The Secured Silicon Sector Entry command allows the following commands to be executed
Once the Secured Silicon Sector Entry Command is issued, the Secured Silicon Sector Exit
command has to be issued to exit Secured Silicon Sector Mode.
The Secured Silicon Sector Exit command may be issued to exit the Secured Silicon Sector
Mode.
DYB Set Command
DYB Clear Command
DYB Status Read Command
Read from Secured Silicon Sector
Program to Secured Silicon Sector
S29GL-N MirrorBit™ Flash Family
D a t a
S h e e t
S29GL-N_00_B3 October 13, 2006