XC2000 datasheet(102/647 Pages) INFINEON

102 / 647 page

XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-40

V1.0, 2007-06

MemoryX2K, V1.1

The command “Disable Read Protection” sets RPRODIS to 1 if the correct passwords

that are stored in SecP0 are supplied. If incorrect passwords are entered the bit PROER

is set and RPRODIS stays unchanged. As protection against “brute force attacks” that

search the correct password the password detection is locked. So after supplying the

first incorrect password all following passwords even the correct ones are rejected with

PROER. This state is only left by an Application Reset or by erasing SecP0.

The disabled protection can be enabled again by the Application Reset or by the

command “Re-Enable Read/Write Protection” which clears RPRODIS again.

The bit PROER can be reset by an Application Reset or by the commands “Reset to

Read” and “Clear Status”.

The command “Disable Write Protection” sets WPRODIS to 1 if the correct passwords

are supplied. It behaves analog to RPRODIS as described above.

The command “Re-Enable Read/Write Protection” clears RPRODIS and WPRODIS.

The commands “Enter Page Mode”, “Enter Security Page Mode”, “Erase Page”,

“Erase Security Page” and “Erase Sector” set PROER if the write access to the

addressed range is not allowed. If a write access is allowed or not is determined by the

next level.

Table 3-4 summarizes how the “Flash State” of protection determines the RPA and WPA

fields of IMB_IMBCTR. For the double bits a short notation is used here and in the

following sections: 1 means active, 0 means inactive, ‘#’ means invalid and ‘–’ means do

not care including invalid states. The symbol ‘|’ means logic or.

Table 3-4

“Flash State” Determining RPA and WPA

IMB_

FSR.

PROI

IMB_

FSR.

PROI

NER

IMB_

FSR.

RPR

IMB_

FSR.

RPR

ODIS

IMB_

FSR.

WPR

ODIS

Resulting Security Level in RPA and WPA

–

Non-protected state:

RPA = 0, WPA = 0.

Protection installed state (possibly disabled,

see below):

–

RPA = 0, WPA = 1.

RPA = 0, WPA = 0.

1 | #

RPA = 1, WPA = 1.

–

RPA = 0, WPA = 0 (all disabled).

1 | #

RPA = 1, WPA = 0.

1 | #

RPA = 0, WPA = 1.

XC2000 Datasheet(PDF) 102 Page - Infineon Technologies AG

XC2000 Datasheet(HTML) 102 Page - Infineon Technologies AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL