S29GL01GS10DFIV13 datasheet(41/108 Pages) CYPRESS

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Document Number: 001-98285 Rev. *R

Page 41 of 108

S29GL01GS/S29GL512S

S29GL256S/S29GL128S

5.6.2

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

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