S26GL01GS11DFV010 datasheet(17/104 Pages) SPANSION

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December 21, 2012 S29GL_128S_01GS_00_07

GL-S MirrorBit® Family

Data

She e t

2.6

Sector Protection Control

2.6.1

Lock Register ASO

The Lock register ASO contains a single word of OTP memory. When the ASO is entered the Lock Register

appears at all word locations in the device address space. However, it is recommended to read or program

the Lock Register only at location 0 of the device address space for future compatibility.

2.6.2

Persistent Protection Bits (PPB) ASO

The PPB ASO contains one bit of a Flash Memory Array for each Sector in the device. When the PPB ASO is

entered, the PPB bit for a sector appears in the Least Significant Bit (LSB) of each address in the sector.

Reading any address in a sector displays data where the LSB indicates the non-volatile protection status for

that sector. However, it is recommended to read or program the PPB only at address 0 of the sector for future

compatibility. If the bit is 0 the sector is protected against programming and erase operations. If the bit is 1 the

sector is not protected by the PPB. The sector may be protected by other features of ASP.

2.6.3

PPB LOCK ASO

The PPB Lock ASO contains a single bit of volatile memory. The bit controls whether the bits in the PPB ASO

may be programmed or erased. If the bit is 0 the PPB ASO is protected against programming and erase

operations. If the bit is 1 the PPB ASO is not protected. When the PPB Lock ASO is entered the PPB Lock bit

appears in the Least Significant Bit (LSB) of each address in the device address space. However, it is

recommended to read or program the PPB Lock only at address 0 of the device for future compatibility.

2.6.4

Password ASO

The Password ASO contains four words of OTP memory. When the ASO is entered the Password appears

starting at address 0 in the device address space. All locations above the forth word are undefined.

2.6.5

Dynamic Protection Bits (DYB) ASO

The DYB ASO contains one bit of a volatile memory array for each Sector in the device. When the DYB ASO

is entered, the DYB bit for a sector appears in the Least Significant Bit (LSB) of each address in the sector.

Reading any address in a sector displays data where the LSB indicates the non-volatile protection status for

that sector. However, it is recommended to read, set, or clear the DYB only at address 0 of the sector for

future compatibility. If the bit is 0 the sector is protected against programming and erase operations. If the bit

is 1 the sector is not protected by the DYB. The sector may be protected by other features of ASP.

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