S29GL128S SPANSION [SPANSION], S29GL128S Datasheet - Page 17

• Manufacturer Part Number: S29GL128S
• Manufacturer: SPANSION [SPANSION]

2.6
March 16, 2012 S29GL_128S_01GS_00_06
2.6.1
2.6.2
2.6.3
2.6.4
2.6.5
Sector Protection Control
Lock Register ASO
Persistent Protection Bits (PPB) ASO
PPB LOCK ASO
Password ASO
Dynamic Protection Bits (DYB) 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.
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 word in the sector.
Reading any word in a sector displays a word where the LSB indicates the non-volatile protection status for
that sector. However, it is recommended to read or program the PPB only at word location 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.
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 word in the device address space. However, it is
recommended to read or program the PPB Lock only at word location 0 of the device for future compatibility.
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.
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 word in the sector.
Reading any word in a sector displays a word 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 word location 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.
D a t a
GL-S MirrorBit
S h e e t
®
Family
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