26HS01GTAM03 datasheet(40/166 Pages) INFINEON

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Datasheet

40 of 166

002-12337 Rev. *Y

2022-01-18

256Mb/512Mb/1Gb SEMPER™ Flash

HYPERBUS™ interface, 1.8V/3.0V

Features

4.5.1.2

PPB lock

The Persistent Protection Lock bit is a volatile bit for protecting all PPB bits. When cleared to 0, it locks all PPBs

and when set to 1, it allows the PPBs to be changed. There is only one PPB Lock bit per device. The PPB Lock

command is used to clear the bit to 0. The PPB Lock bit must be cleared to 0 only after all the PPBs are configured

to the desired settings.

In Persistent Protection mode, the PPB Lock bit is set to 1 during POR or a Hardware Reset. When cleared with

the PPB Lock bit Clear sequence, no software command sequence can set the PPB Lock bit, only another

Hardware Reset or Power-Up can set the PPB Lock bit.

In the Password Protection mode, the PPB Lock bit is cleared to 0 during POR or a Hardware Reset. The PPB Lock

bit can only set to 1 by the Password Unlock command sequence. The PPB Lock bit can be cleared back to 0 with

the PPB Lock bit Clear sequence

4.5.1.3

DYB (Volatile) sector protection

Dynamic Protection Bits (DYB) are volatile and unique for each sector and can be individually modified. DYBs only

control protection for sectors that have their PPBs cleared. By issuing the DYB Write transaction, the DYB are set

to 0 or cleared to 1, thus placing each sector in the protected or unprotected state respectively. This feature

allows software to easily protect sectors against inadvertent changes, yet does not prevent the easy removal of

protection when changes are needed. As mentioned above, the DYBs can be set to 0 or cleared to 1 as often as

needed.

4.5.1.4

PPB (Nonvolatile) sector protection

The Persistent Protection Bits (PPB) are located in a separate nonvolatile flash array. One of the PPB bits is

assigned to each sector. When a PPB is programmed to 0 its related sector is protected from program and erase

operations. The PPB are programmed individually but must be erased as a group, similar to the way individual

words may be programmed in the main array but an entire sector must be erased at the same time. Programming

a PPB bit requires the typical word programming time. During a PPB bit programming operation or PPB bit

erasing, the Status Register can be accessed to determine when the operation has completed. Erasing all the

PPBs requires typical sector erase time.

4.5.1.5

Persistent protection mode

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

are unprotected by a device reset. 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 to 1 therefore the PPB Lock bit will

remain at 0 until the next power-off or Hardware Reset.

4.5.1.6

Password protection mode

Password Protection mode allows an even higher level of security than the Persistent Sector Protection mode,

by requiring a 64-bit password for setting the PPB Lock bit. In addition to this password requirement, after

Power-Up or Hardware Reset, the PPB Lock bit is cleared to 0 to ensure protection at Power-Up. Successful

execution of the Password Unlock command by entering the entire password sets the PPB Lock bit to 1, allowing

for sector PPB modifications. The Password Protection scheme flowchart is shown in Figure 29.

26HS01GTAM03 Datasheet(PDF) 40 Page - Infineon Technologies AG

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