IS25LEG-RLLA2:P-TY datasheet(164/193 Pages) ISSI

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IS25LE01GG

IS25WE01GG

Integrated Silicon Solution, Inc.- www.issi.com

164

Rev. A3

10/02/2025

8.62 UNLOCK PASSWORD OPERATION (UNPWD, E9h)

The UNPWD command is entered by driving CE# low, followed by the instruction code and the password data

bytes, least significant byte first, most significant bit of each byte first. The password is 64bits in length.

CE# must be driven high after the 64th bit of data has been latched. If not, the UNPWD command is not executed.

As soon as CE# is driven high, the UNPWD operation is initiated. While the UNPWD operation is in progress, the

Status Register or Extended Read Register may be read to check the value of the Write In Progress (WIP) bit. The

WIP bit is “1” during the UNPWD operation, and is “0” when it is completed.

If the UNPWD command supplied password does not match the hidden password in the Password Register, the

UNPWD command is ignored. This returns the device to standby state, ready for a new command such as a retry

of the UNPWD command. If the password does match, the PPB Lock bit is set to “1”.

Figure 8.139 Unlock Password Sequence In SPI Mode

Instruction = E9h

CE #

SCK

...

Mode 3

Mode 0

...

1st byte Data In

2nd byte Data In

...

8th byte Data In

High Impedence

Figure 8.140 Unlock Password Sequence In QPI Mode

E9h

CE#

SCK

IO[3:0]

Mode 3

Mode 0

1st byte

Data In

2nd byte

Data In

...

8th byte

Data In

...

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