XC2000 datasheet(103/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-41

V1.0, 2007-06

MemoryX2K, V1.1

3.9.6.3

The Upper Layer “Protection State”

This layer consists mainly of the 4 fields DCF, DDF, WPA and RPA of the IMB_IMBCTR

lower layers. Some of the above mentioned command sequences directly influence

these fields as well. In order to increase the resistance against beaming or power supply

manipulation all 4 fields are coded with 2 bits. Generally “01” means active, “10” inactive

and the two other states “00” and “11” are invalid and are recognized as “attacked” state.

Effective Security Level

The effective security level based on these 4 double-bits is summarized in Table 3-5 and

Table 3-6. For the double bits the same short notation is used as before: 1 means active,

0 means inactive, ‘#’ means invalid and ‘–’ means do not care including invalid states.

Errored protection state (see below):

–

RPA = 1, WPA = 1.

–

RPA = 1, WPA = 0.

–

RPA = 0, WPA = 1.

–

RPA = 0, WPA = 0.

Table 3-5

Effective Read Security

RPA

DCF

DDF

Security Level

–

No read protection.

1 | #

No read protection.

–

1 | #

Data reads prohibited.

1 | #

–

Code fetches prohibited.

Table 3-6

Effective Write Security

WPA

RPA

Security Level

–

No write protection

Table 3-4

“Flash State” Determining RPA and WPA (cont’d)

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

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