26HS01GTAM03 datasheet(41/166 Pages) INFINEON

41 / 166 page

Datasheet

41 of 166

002-12337 Rev. *Y

2022-01-18

256Mb/512Mb/1Gb SEMPER™ Flash

HYPERBUS™ interface, 1.8V/3.0V

Features

Figure 29

Password protection scheme flowchart

Password protection notes

• The Password Program Command is only capable of programming 0’s.

• The password is all 1’s when shipped from CYPRESS™. It is located in its own memory space and is accessible

through the use of the Password Program and Password Read commands.

• All 64-bit password combinations are valid as a password.

• Once the password is programmed and verified, the Password Protection Mode Locking bit must be

programmed (to ‘0’) to prevent reading the password.

• The Password Protection Mode Lock bit, once programmed (to 0), prevents reading the 64-bit password on the

data bus and further password programming. All further program and read commands to the password region

are disabled and these commands are ignored. In Legacy (x1) SPI, attempted programming of a protected

Password will set the Program Status bit. In HYPERBUS™, attempted programming of a protected Password will

set the Sector Lock Status bit and the Program Status bit. If a further programming operation is attempted on

either the Password or the Password Protection Mode Lock bit the operation will be aborted and the failure will

be indicated in the Status Register. There is no means to verify what the password is after the Password

Protection Mode Lock bit is programmed. Password verification is only allowed before selecting the Password

Protection mode.

• The Password Mode Lock bit is not erasable.

• The device requires tPSWD for setting the PPB Lock bit after the valid 64-bit password is given to the device.

• The Password Unlock command is used to unlock the password. If the supplied password does not match the

hidden internal password, the device gets locked out and does not accept any further instructions. Either a

hardware reset or a CS# Signaling Reset or a power cycle are required to bring the device back to standby mode

to try reentering the password again.

• If the password is lost after setting the Password Mode Lock bit, there is no way to clear the PPB Lock bit.

Power up

Hardware Reset

ASPPWD = 0

Password Protection

Yes

PPBLock Bit = 0

ASP Register Bits = Program Protected

PPB Bits = Erase/Program Protected

PWD = Unlock

PPBLock Bit = 1

ASP Register Bits = Program Protected

PPB Bits = Erase/Program UnProtected

Yes

Fail

Default Protection

PPBLock Bit = 1

ASP Register Bits = Program UnProtected

PPB Bits = Erase/Program UnProtected

26HS01GTAM03 Datasheet(PDF) 41 Page - Infineon Technologies AG

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