S29GL256N10TFI023 ETC, S29GL256N10TFI023 Datasheet - Page 68
S29GL256N10TFI023
Manufacturer Part Number
S29GL256N10TFI023
Description
MirrorBit Flash Family
Manufacturer
ETC
Datasheet
1.S29GL256N10TFI023.pdf
(110 pages)
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Lock Register Command Set Definitions
Password Protection Command Set Definitions
gram operation using the DQ7 or DQ6 status bits, just as in the standard word
program operation. Refer to the Write Operation Status section for more
information.
In the erase-suspend-read mode, the system can also issue the autoselect com-
mand sequence. Refer to the Autoselect Mode section and “Autoselect Command
Sequence” section on page 58 sections for details.
To resume the sector erase operation, the system must write the Erase Resume
command. The address of the erase-suspended sector is required when writing
this command. Further writes of the Resume command are ignored. Another
Erase Suspend command can be written after the chip has resumed erasing. It is
important to allow an intervalof at least 5 ns between Erase Resume and Erase
Suspend.
The Lock Register Command Set permits the user to one-time program the SecSi
Sector Protection Bit, Persistent Protection Mode Lock Bit, and Password Protec-
tion Mode Lock Bit. The Lock Register bits are all readable after an initial access
delay.
The Lock Register Command Set Entry command sequence must be issued
prior to any of the following commands listed, to enable proper command
execution.
Note that issuing the Lock Register Command Set Entry command disables
reads and writes for the flash memory.
The Lock Register Command Set Exit command must be issued after the ex-
ecution of the commands to reset the device to read mode. Otherwise the device
will hang. If this happens, the flash device must be reset. Please refer to RESET#
for more information. It is important to note that the device will be in either Per-
sistent Protection mode or Password Protection mode depending on the mode
selected prior to the device hang.
For either the SecSi Sector to be locked, or the device to be permanently set to
the Persistent Protection Mode or the Password Protection Mode, the associated
Lock Register bits must be programmed. Note that the Persistent Protection
Mode Lock Bit and Password Protection Mode Lock Bit can never be pro-
grammed together at the same time. If so, the Lock Register Program
operation will abort.
The Lock Register Command Set Exit command must be initiated to re-
enable reads and writes to the main memory.
The Password Protection Command Set permits the user to program the 64-bit
password, verify the programming of the 64-bit password, and then later unlock
the device by issuing the valid 64-bit password.
The Password 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 Password Protection Command Set Entry command
disabled reads and writes the main memory.
Lock Register Program Command
Lock Register Read Command
S29GLxxxN MirrorBitTM Flash Family
A d v a n c e
I n f o r m a t i o n
27631A4 May 13, 2004
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