S29GL01GS10DFIV13 datasheet(11/108 Pages) CYPRESS

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Document Number: 001-98285 Rev. *R

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S29GL01GS/S29GL512S

S29GL256S/S29GL128S

2.7

Sector Protection Control

2.7.1

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. See Figure 11.16 on page 87 for ASO Entry timing requirements. However, it is

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

2.7.2

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. See Figure 11.16 on page 87 for ASO Entry

timing requirements. 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.

2.7.3

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. See Figure 11.16 on page 87 for ASO Entry timing requirements. However, it is recommended to read or

program the PPB Lock only at address 0 of the device for future compatibility.

2.7.4

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. See Figure 11.16 on page 87 for ASO Entry timing requirements. All locations above the forth word are

undefined.

2.7.5

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. See Figure 11.16 on page 87 for ASO Entry

timing requirements. 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.

2.8

ECC Status ASO

The system can access the ECC Status ASO by issuing the ECC Status entry command sequence during Read Mode. The ECC

Status ASO provides the status of a Single Bit Error correction when reading the selected page. Automatic ECC on page 22

describes the ECC function in more detail. See Figure 11.16 on page 87 for ASO Entry timing requirements.

The ECC Status ASO allows the following activities:



Read ECC Status for the selected page.



ASO Exit.

2.8.1

ECC Status

The contents of the ECC Status ASO indicates, for the selected ECC page, whether ECC protection has corrected an error in the

eight-bit error correction code or the 16 Words of data in the ECC page. The address specified in the ECC Status Read Command,

provided in Table7.1 onpage55 selects the ECC Page.

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