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SRI4K 数据表(PDF) 15 Page - STMicroelectronics

部件名 SRI4K
功能描述  13.56 MHz short-range contactless memory chip with 4096-bit EEPROM and anticollision functions
PDF  45 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

SRI4K 数据表(HTML) 15 Page - STMicroelectronics

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SRI4K
Memory mapping
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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 SRI4K 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
b0
Description
Resettable
OTP bit
0
1
2
3
4
32-bit Boolean area
32-bit Boolean area
32-bit Boolean area
32-bit Boolean area
32-bit Boolean area
ai07657b
ai07658
1
...
1
1
01011
11
1
0
11
1
...
1
0
01011
00
1
1
11
1
...
1
0
01011
00
1
0
11
Previous data stored in block
Data to be written
New data stored in block
b31
b0
ai07659
1
...11
0
1011
11
1
0
11
1
...11
1
1011
00
1
1
11
1
...
1
1
1
1011
00
1
1
11
Previous data stored in block
Data to be written
New data stored in block
b31
b0



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