IS25LP256D-RGLA3 datasheet(36/174 Pages) ISSI

36 / 174 page

IS25LP256D

IS25WP256D

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

Rev A6

04/15/2019

Sector/Block Protection States Summary

Each sector in specific blocks and each of all other blocks except for the specific blocks can be in one of the

following protection states:

 Unlocked – The sector/block is unprotected and protection can be changed by a simple command. The

protection state defaults to unprotected after a power cycle, software reset, or hardware reset.

 Dynamically Locked – A sector/block is protected and protection can be changed by a simple command. The

protection state is not saved across a power cycle.

 Persistently Locked – A sector/block is protected and protection can only be changed if the PPB Lock bit is set

“1”. The protection state is non-volatile and saved across a power cycle or reset. Changing the protection

state requires programming and or erase of the PPB bits.

Table 7.4 contains all possible combinations of the DYB, PPB, and PPB Lock bit relating to the status of the

sector/block. In summary, if the PPB Lock bit is locked (cleared

to “0”), no changes to the PPBs are allowed. The

PPB Lock bit can only be unlocked (

set to “1”) through a Hardware Reset or power cycle.

Table 7.4 Sector/Block Protection States

“0” = Locked or Protected

“1” = Unlocked or Unprotected

Protection Bit values

Assigned Sector/Block State

PPB

DYB

Unprotected

Protected

PPB Lock Bit

Changeable

NOT changeable

Changeable

IS25LP256D-RGLA3 数据表(PDF) 36 Page - Integrated Silicon Solution, Inc