MX25L12835F
9-37. Gang Block Lock/Unlock (GBLK/GBULK)
These instructions are only effective after WPSEL was executed. The GBLK/GBULK instruction is a chip-based pro-
tected or unprotected operation. It can enable or disable all DPB.
The WREN (Write Enable) instruction is required before issuing GBLK/GBULK instruction.
The sequence of issuing GBLK/GBULK instruction is: CS# goes low → send GBLK/GBULK (7Eh/98h) instruction
→CS# goes high.
Both SPI (8 clocks) and QPI (2 clocks) command cycle can accept by this instruction. The SIO[3:1] are don't care
when during SPI mode.
The CS# must go high exactly at the byte boundary, otherwise, the instruction will be rejected and not be executed.
Sector Protection States Summary Table
Protection Status
Sector State
DPB bit
Unprotect
Unprotect
Unprotect
Unprotect
Protect
SPB bit
Unprotect
Unprotect
Protect
SPB Lock bit
lock
Unprotect – SPB is unchangeable
Unprotect – SPB is changeable
Protect – SPB is unchangeable
Protect – SPB is changeable
Protect – SPB is unchangeable
Protect – SPB is changeable
Protect – SPB is unchangeable
Protect – SPB is changeable
un-lock
lock
Protect
un-lock
lock
Unprotect
Unprotect
Protect
Protect
un-lock
lock
Protect
Protect
Protect
un-lock
P/N: PM1795
REV. 1.0, OCT. 23, 2012
71
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