Specifications

44 GL-S MirrorBit
®
Family IS29GL_128S_01GS_00_Rev.A February 2015
Data Sheet
5.5.2 Protection Error
If an embedded algorithm attempts to change data within a protected area (program, or erase of a protected
sector or OTP area) the device (EAC) goes busy for a period of 20 to 100 µs then returns to normal operation.
During the busy period the RY/BY# output remains Low, data polling status continues to be overlaid on all
address locations, and the status register shows not ready with invalid status bits (SR[7] = 0).
During the protection error status busy period the data polling status will show the following:
 DQ7 is the inversion of the DQ7 bit in the last word loaded into the write buffer. DQ7 = 0 for an erase
failure
 DQ6 continues to toggle, independent of the address used to read status
 DQ5 = 0; to indicate no failure of the embedded operation during the busy period
 DQ4 is RFU and should be treated as don’t care (masked)
 DQ3 = 1 to indicate embedded sector erase in progress
 DQ2 continues to toggle, independent of the address used to read status
 DQ1 = 0; Write buffer abort error
 DQ0 is RFU and should be treated as don’t care (masked)
Commands that are accepted during the protection error status busy period are:
 Status Register Read
When the busy period ends the device returns to normal operation, the data polling status is no longer
overlaid, RY/BY# is High, and the status register shows ready with valid status bits. The device is ready for
flash array read or write of a new command.
After the protection error status busy period the Status Register will show the following:
 SR[7] = 1; Valid status displayed
 SR[6] = X; May or may not be erase suspended after the protection error busy period
 SR[5] = 1 on erase error, else = 0
 SR[4] = 1 on program error, else = 0
 SR[3] = 0; Program not aborted
 SR[2] = 0; No Program in suspension
 SR[1] = 1; Error due to attempting to change a protected location
 SR[0] = X; RFU, treat as don’t care (masked)
Commands that are accepted after the protection error status busy period are:
 Any command