Document Number: 001-98285 Rev. *R
Page 18 of 108
S29GL01GS/S29GL512S
S29GL256S/S29GL128S
The Sector Addresses and Word Line Addresses are compared while the password address/data are loaded. If the Sector
Address don't match than the error will be reported at the end of that write cycle. The status register will return to the ready
state with the Program Status Bit set to 1, Program Status Register Bit set to 1, and Write Buffer Abort Status Bit set to 1
indicating a failed programming operation. It is a failure to change the state of the PPB Lock bit because it is still protected
by the lack of a valid password. The data polling status will remain active, with DQ7 set to the complement of the DQ7 bit in
the last word of the password unlock command, and DQ6 toggling. RY/BY# will remain low.
The specific address and data are compared after the Program Buffer To Flash command has been given. If they don't
match to the internal set value than the status register will return to the ready state with the Program Status Bit set to 1 and
Program Status Register Bit set to 1 indicating a failed programming operation. It is a failure to change the state of the PPB
Lock bit because it is still protected by the lack of a valid password. The data polling status will remain active, with DQ7 set
to the complement of the DQ7 bit in the last word of the password unlock command, and DQ6 toggling. RY/BY# will remain
low.
The device requires approximately 100 µs for setting the PPB Lock after the valid 64-bit password is given to the device.
The Password Unlock command cannot be accepted any faster than once every 100 µs ± 20 µs. This makes it take an
unreasonably long time (58 million years) for a hacker to run through all the 64-bit combinations in an attempt to correctly
match a password. The EA status checking methods may be used to determine when the EAC is ready to accept a new
password command.
If the password is lost after setting the Password Mode Lock Bit, there is no way to clear the PPB Lock.
