26HS01GTAM03 datasheet(39/166 Pages) INFINEON

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Datasheet

39 of 166

002-12337 Rev. *Y

2022-01-18

256Mb/512Mb/1Gb SEMPER™ Flash

HYPERBUS™ interface, 1.8V/3.0V

Features

Figure 28

DYB and PPB protection control

ASP provides a rich set of configuration options producing multiple data protection schemes which can be

employed based on design or system needs. These configuration options are discussed in ASP protection

summary on page 39 through Legacy (x1) SPI ASP related registers and transactions on page 44.

4.5.1.1

ASP protection summary

The PPB bits are protected from program and erase when the PPB Lock bit is 0. There are two methods for

managing the state of the PPB Lock bit: Persistent Protection and Password Protection.

The Persistent Protection mode sets the PPB Lock bit to 1 during POR or Hardware Reset so that the PPB bits are

unprotected by a device reset. Software Reset does not affect the PPB Lock bit. There is a command to clear the

PPB Lock bit to 0 to protect the PPB. There is no command in the Persistent Protection method to set the PPB

Lock bit therefore the PPB Lock bit will remain at 0 until the next Power-Off or Hardware Reset. The Persistent

Protection method allows boot code the option of changing sector protection by programming or erasing the

PPB, then protecting the PPB from further change for the remainder of normal system operation by clearing (to

0) the PPB Lock bit. This is sometimes called Boot-Code Controlled Sector Protection.

The Password Protection mode clears the PPB Lock bit to 0 during POR or Hardware Reset to protect the PPB. A

64-bit password may be permanently programmed and hidden for the Password method. A command can be

used to provide a password for comparison with the hidden password. If the password matches the PPB Lock bit

is set to 1 to unprotect the PPB. A command can be used to clear the PPB Lock bit to 0. This method requires use

of a password to control PPB Protection.

The selection of the PPB Lock management method is made by programming OTP bits in the ASP Configuration

Each sector can be in one of the following protection states:

• Unlocked – The sector is unprotected and protection can be changed by a simple command. The protection

state defaults to unprotected after a power cycle or Hardware Reset.

• Dynamically Locked –A sectorisprotectedandprotectioncan be changed byasimple command. The protection

state is not saved across a power cycle or Hardware Reset.

• Persistently Locked – A sector is protected and protection can only be changed if the PPB Lock bit is set to 1.

The protection state is nonvolatile and saved across a power cycle or Hardware Reset. Changing the protection

state requires programming or erase of the PPB bits.

Table 24

Sector protection states

Protection bit values

Sector state

PPB lock bit

PPB

DYB

Unprotected – PPB and DYB are changeable

Protected – PPB and DYB are changeable

Unprotected – PPB not changeable, DYB is changeable

Protected – PPB not changeable, DYB is changeable

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