XC2000 datasheet(105/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-43

V1.0, 2007-06

MemoryX2K, V1.1

•

A successful “Disable Write Protection” sets WPRODIS and clears WPA.

•“Re-Enable Read/Write Protection” clears RPRODIS and WPRODIS and sets RPA

and WPA according to Table 3-4 depending on PROIN, PROINER and RPRO.

Double indirect by changing security pages. After executing a command sequence that

changed the content of a security page the IMB Core immediately reads back the pages

and determines all resulting security data as described for system startup in

“Initialization of the Effective Security Level” on Page 3-42. The examples in

“Protection Handling Examples” on Page 3-45 will show how this can be used for

installing and removing protection or changing passwords.

3.9.6.4

Reaction on Protection Violation

If software tries to violate the protection rules the following happens:

•

Reading data when read protection is effective: The bit IMB_FSR.PROER is set and

the Flash access trap can be triggered via the SCU if IMB_INTCTR.DPROTRP is 0.

Default data is delivered.

•

Fetching code when read protection is effective: the trap code “TRAP 15D” is

delivered instead.

•

Programming or erasing memory ranges when they are write protected: PROER is

set.

3.9.6.5

Layout of the Security Pages

The previous sections just mentioned the content of the security pages. This section

depicts their exact layout. Figure 3-8 depicts symbolically the layout of the security

pages 0 and 1.

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