S29GL01GS datasheet(23/104 Pages) SPANSION

23 / 104 page

December 21, 2012 S29GL_128S_01GS_00_07

GL-S MirrorBit® Family

Data

She e t

 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.

S29GL01GS 데이터시트(PDF) 23 Page - SPANSION