28HS01GTAM03 datasheet(46/138 Pages) INFINEON

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Datasheet

46 of 138

002-18216 Rev. *W

2022-01-18

256Mb/512Mb/1Gb SEMPER™ Flash

Octal interface, 1.8V/3.0V

Features

Figure 48

Permanent PPB sector protection flowchart

4.5.2.5

Temporary PPB protection scheme

PPB based nonvolatile protection architecture can be temporarily locked where erasing and programming of the

individual PPB bits is inhibited. The Persistent Protection Lock Bit (PPBLock) 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 PPBLock transaction (WRPLB_0_0) 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. The PPB Lock Bit is set to 1 during

POR or a Hardware Reset. When cleared with the PPBLock transaction, no software command sequence can set

PPBLock, only another Hardware Reset or Power-Up can set PPBLock.

Note Temporary PPB Protection does not require any ASP configuration.

4.5.2.6

Password protection scheme

Password Protection scheme allows an even higher level of security by requiring a 64-bit password for setting

PPBLock. 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. Selecting bit 2 in

Advanced Sector Protection Register (ASPO[2] - ASPPWD) selects the Password Protection scheme. Password

Protection scheme also protects ASPO from write or program.

Note A password must be programmed before selecting the password protection scheme. The password unlock

SPI transaction (PWDUL_0_1) or Octal transaction (PWDUL_4_1) is used to provide a password for comparison.

The Password Protection scheme flowchart is shown in Figure 49.

28HS01GTAM03 数据表(PDF) 46 Page - Infineon Technologies AG