IS25LE512MG-RLLA2:PTY datasheet(23/194 Pages) ISSI

23 / 194 page

IS25LE512MG

IS25WE512MG

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

Rev. A6

10/02/2025

WEL bit: Write Enable Latch (WEL) bit indicates the status of the internal write enable latch. When WEL bit is “0”,

the internal write enable latch is disabled and the Write operations described in Table 6.3 are inhibited. When WEL

bit is “1”, the Write operations are allowed. WEL bit is set by a Write Enable (WREN, 06h) instruction. Most of Write

Non-Volatile/Volatile Register, Program and Erase instruction must be preceded by a WREN instruction.

WEL bit can be reset by a Write Disable (WRDI) instruction. It will automatically reset after the completion of any

Write Non-Volatile Register, Program and Erase operation.

BP3, BP2, BP1, BP0 bits: The Block Protection (BP3, BP2, BP1 and BP0) bits are used to define the portion of

the memory area to be protected. Refer to Table 6.4 for the Block Write Protection (BP) bit settings. When a defined

combination of BP3, BP2, BP1 and BP0 bits are set, the corresponding memory area is protected. Any program or

erase operation to that area will be inhibited.

Note: A Chip Erase (CER) instruction will be ignored unless all the Block Protection Bits are “0”s.

SRWD bit: The Status Register Write Disable (SRWD) bit operates in conjunction with the Write Protection (WP#)

signal to provide a Hardware Protection Mode. When the SRWD is set to “0”, the Status Register is not write-

protected. When the SRWD is set to “1” and the WP# is pulled low (VIL), the bits of Status Register (SRWD, QE,

BP3, BP2, BP1, BP0) become read-only, and a WRSR instruction will be ignored. If the SRWD is set to “1” and

WP# is pulled high (VIH), the Status Register can be changed by a WRSR instruction.

QE bit: The Quad Enable (QE) is a non-volatile bit in the Status Register that allows quad operation. When the QE

bit is set to “0”, the pin WP# and HOLD#/RESET# are enabled. When the QE bit is set to “1”, the IO2 and IO3 pins

are enabled.

WARNING: The QE bit must be set to “0” if WP# or HOLD#/RESET# pin (or ball) is tied directly to the power supply.

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