MX66L51235FMI-10G datasheet(76/83 Pages) MCNIX

76 / 83 page

MX66L51235F

Rev. 1.1, August 02, 2016

P/N: PM1832

9-34-5. Temporary Un-protect Solid write protect bit (USPB)

Temporary Un-protect Solid write Protect Bit is volatile bit. Software can temporarily unprotect write protect sectors

despite of SPBs' property when DPBs are cleared. While the USPB=1, all the SPBs’ property is masked.

Notes:

1. Upon power up, the USPB status is default protected. The USPB can be unprotected (to “0”) or protected (to “1”)

as often as needed. The hardware reset will reset USPB/DPB to their default values.

2. Please refer to "9-34-7. Sector Protection States Summary Table" for the sector state with the protection status of

DPB/SPB/USPB bits.

9-34-6. Gang Block Lock/Unlock (GBLK/GBULK)

These instructions are only effective after WPSEL was executed. The GBLK/GBULK instruction is a chip-based

protected 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.

9-34-7. Sector Protection States Summary Table

Protection Status

Sector State

DPB bit

SPB bit

USPB bit

Unprotect

Protect

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