26HS01GTAM03 datasheet(43/166 Pages) INFINEON

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Datasheet

43 of 166

002-12337 Rev. *Y

2022-01-18

256Mb/512Mb/1Gb SEMPER™ Flash

HYPERBUS™ interface, 1.8V/3.0V

Features

Figure 30

Read password protection scheme flowchart

Read password protection notes

• Read Password is enabled by programming the ASPR[5] bit to 0.

• The command sequence for programming, reading, and locking of the Password for Read Password Method is

the same as the default for the PPB Password Method.

• When the Read Password mode and Password Protection mode are enabled (i.e., ASPR[2] and ASPR[5] are

programmed to 0), then all addresses are redirected to the Boot Sector until the password unlocking sequence

is properly entered with the correct password. At which time, the Read Password mode is disabled and all

addressing will select the proper location.

• If a system Hardware Reset occurs, then the Read Password mode is re-enabled.

• ASPR[5] is used to select between Read Password versus PPB Password options. If ASPR[5] = 0 then the device

is ready for Read Password. However, Read Password is not enabled until ASPR[2] = 0. At which point, all

addresses select only within the top or bottom sectors, until the device is unlocked with the proper unlocking

sequence and Password. When ASPR[2] = 1 the addresses select normally. This allows users to program in code,

test it, provide a password, and then lock it by programming ASPR[2] = 0.

• The Read Password command sequence return undefined results if sent when Read Password Protection is in

use. The PPB Lock bit may only be returned to 0 by a Hardware Reset, POR or the PPB Lock bit Clear command

sequence.

• Only the ID Read command, Password Unlock command and array reads are valid during Read Password mode

while the PPB Lock bit = 0. Other commands are disabled until the password is supplied to enable reading of

the entire device and normal command operation.

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