SRI2K datasheet(15/45 Pages) STMICROELECTRONICS

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SRI2K

Memory mapping

Doc ID 15779 Rev 3

15/45

4.1

Resettable OTP area

In this area contains five individual 32-bit Boolean words (see Figure 12 for a map of the

area). A Write_block command will not erase the previous contents of the block as the write

cycle is not preceded by an auto-erase cycle. This feature can be used to reset selected bits

from 1 to 0. All bits previously at 0 remain unchanged. When the 32 bits of a block are all at

0, the block is empty, and cannot be updated any more. See Figure 13 and Figure 14 for

examples of the result of the Write_block command in the resettable OTP area.

Figure 12.

Resettable OTP area (addresses 0 to 4)

Figure 13.

Write_block update in Standard mode (binary format)

The five 32-bit blocks making up the resettable OTP area can be erased in one go by adding

an auto-erase cycle to the Write_block command. An auto-erase cycle is added each time

the SRI2K detects a Reload command. The Reload command is implemented through a

specific update of the 32-bit binary counter located at block address 6 (see “Section 4.2: 32-

bit binary counters” for details).

Figure 14.

Write_block update in Reload mode (binary format)

Block

address

MSb

b31

32-bit block

b16 b15

b24 b23

b8 b7

LSb

Description

Resettable

OTP bit

32-bit Boolean area

ai07657b

ai07658

...

01011

...

01011

...

01011

Previous data stored in block

Data to be written

New data stored in block

b31

ai07659

...11

1011

...11

1011

...

1011

Previous data stored in block

Data to be written

New data stored in block

b31

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