28HS01GTAM03 datasheet(48/138 Pages) INFINEON

48 / 138 page

Datasheet

48 of 138

002-18216 Rev. *W

2022-01-18

256Mb/512Mb/1Gb SEMPER™ Flash

Octal interface, 1.8V/3.0V

Features

4.5.2.7

Read password protection scheme

The Read Password Protection scheme replaces the Password Protection scheme and provides the most data

protection. The Read Password Protection scheme enables protecting the Flash Memory Array from read,

program, and erase. Only the lowest or highest (256-KB) sector address range, selected by bit 5 of Configuration

'0' selects from the top most sector and a '1' selects from the bottom most sector irrespective of the sector

address supplied in the read transaction. Note that reads from the read-protected portion of the array will alias

back to the readable sector.

Note A password must be programmed before selecting the Read 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 Read Password Protection scheme flowchart is shown in Figure 50.

Figure 50

Read password protection scheme flowchart

4.5.2.8

PPB Bits - OTP selection

ASP provides a configuration option to permanently disable the PPB erase transaction (ERPPB_0_0). This makes

all PPB bits one-time programmable. With this option, once the PPB protection is selected, it can never be

changed. Selecting bit 3 in Advanced Sector Protection Register (ASPO[3] - ASPPPB) makes PPB bits OTP.

28HS01GTAM03 Datasheet(PDF) 48 Page - Infineon Technologies AG