IS25LE01G-RILA3-TY datasheet(162/186 Pages) ISSI

162 / 186 page

IS25LE01G

IS25WE01G

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

162

Rev. A6

01/14/2025

8.61 PROGRAM PASSWORD OPERATION (PGPWD, E8h)

Before the Program Password (PGPWD) command can be accepted by the device, a Write Enable (WREN)

command must be issued and decoded by the device which sets the Write Enable Latch (WEL) to enable the

PGPWD operation. The password can only be programmed before the Password Mode is selected by programming

the Password Protection Mode bit to “0” in the ASP Register (ASP[2]). After the Password Protection Mode is

selected the PGPWD command is ignored.

The PGPWD 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 PGPWD command is not executed.

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

Status Register may be read to check the value of the Write

In Progress (WIP) bit. The WIP bit is “1” during the

PGPWD

operation, and is “0” when it is completed. When the PGPWD operation is completed, the Write Enable

Latch (WEL) is set to “0”.

Figure 8.134 Program Password Sequence In SPI Mode

Instruction = E8h

CE #

SCK

...

Mode 3

Mode 0

...

st byte Data In

nd byte Data In

...

th byte Data In

High Impedence

Figure 8.135 Program Password Sequence In QPI Mode

E8h

CE#

SCK

IO[3:0]

Mode 3

Mode 0

st byte

Data In

nd byte

Data In

...

th byte

Data In

...

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