S29GL01GS10DFIV13 datasheet(18/108 Pages) CYPRESS

18 / 108 page

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.

S29GL01GS10DFIV13 Datasheet(PDF) 18 Page - Cypress Semiconductor