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S29GL01GT13TFNyyxx Datasheet(Fiches technique) 17 Page - Cypress Semiconductor

Numéro de pièce S29GL01GT13TFNyyxx
Description  1 Gbit (128 Mbyte), 512 Mbit (64 Mbyte)
Télécharger  105 Pages
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Fabricant  CYPRESS [Cypress Semiconductor]
Site Internet  http://www.cypress.com
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 17 page
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Document Number: 002-00247 Rev. *G
Page 17 of 105
S29GL01GT, S29GL512T
The exact password must be entered in order for the unlocking function to occur.
– The addresses can be loaded in any order but all 4 words are required for a successful match to occur.
– The Sector Addresses (Amax–A16) and Word Line Addresses (A15–A8) are compared to ‘zero’ while the password address/
data are loaded. If the Sector Address or Word Line Address don’t match then 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 and Write Buffer Abort Status Bit set
to 1 indicating a failed programming operation. 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 indicating a
failed programming operation. 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. In this error case due to incorrect
password, the device requires a wait time of tPPB and a software reset command to clear the error prior to the Password ASO
Exit command to properly exit the Password ASO. Failure to do so will cause the device to remain in the Password ASO.
The device requires tPPB for setting the PPB Lock after the valid 64-bit password is given to the device.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.




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