XC2000 datasheet(98/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Memory Organization

Preliminary

User’s Manual

3-36

V1.0, 2007-06

MemoryX2K, V1.1

retention, i.e. after a while they may toggle. This dangerous state can be detected with

“read margins”.

Reading with “hard read 0 margin” returns weak 0s as 1s and reading with “hard read 1

margin” returns weak 1s as 0s. Changing the read margin is done with the command

sequence “Change Read Margin” and is reported by the status register “IMB_MAR”.

In order to detect cells that will likely fail in the near future all used flash memory ranges

can be read with both hard reads regularly. If both read values are the same and no read

error occurs nothing has to be done. If this check fails there is still a good chance that

the normal read will return the correct value (or at least has only a correctable one-bit

error). After erasing the page this value can be programmed again to ensure long-term

readability of this data.

In case of using the page erase care must be taken not to exceed the drain disturb limit

of the other pages of the same sector.

3.9.5.4

Protection Overview

The flash memory supports read and write protection for the whole memory and

separate write protection for each logical sector. The logical sector structure is depicted

in Figure 3-6.

Figure 3-6

Logical Sectors

If read protection is installed and active, any flash read access is disabled in case of start

after reset from external memory or from internal RAM. Debug access is as well disabled

and thus the execution of injected OCDS instructions. In case of start after reset in

flash_array_logsectors_diagram.vsd

256 KB Array

Phys.

Sector

Number

Logical

Grouping

Logical

Sector

Address

Logical

Sector

Number

0 - 3 = 4 * 4 KB

4 = 16 KB

5 = 16 KB

6 = 12 KB/16 KB

7 = 64 KB

8 = 64 KB

9 = 64 KB

Phys. Sector 15

Reserved in

Flash 0

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