AT88SA10HS-SH-T 데이터 시트보기 (PDF) - Atmel Corporation
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AT88SA10HS-SH-T Datasheet PDF : 25 Pages
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1.2 Fuse Map
The AT88SA10HS incorporates 128 one-time fuses within the chip. Once burned, there is no way to reset the value of a fuse.
All fuses, with the exception of the Fuse MfrID and Fuse SN bits initialized by Atmel, have a value of one when shipped from
the Atmel factory and transition to zero when they are burned. These fuses are burned at system personalization and cannot
be changed after that time.
Table 1-1. Fuse Map
Fuse #
Name
0 63
Secret Fuses
64 86
Status Fuses
87
Fuse Disable
88 95
96 127
Fuse MfrID
Fuse SN
Description
These fuses can be securely written by the BurnSecure command but can never be read
with the read command
These fuses can be written with the BurnSecure command and can always be read with
the Read command
The HOST commands ignore the values of Fuse[0-63] until this bit is burned. Once this
bit is burned, the BurnSecure command is disabled
See Section 1.3. Set by Atmel, cannot be modified in the field
See Section 1.3. Set by Atmel, cannot be modified in the field
Secret Fuses
Status Fuses
Fuse Disable
These 64-fuses are used to augment the mask programmed keys stored in the chip by Atmel.
Knowledge of both the mask keys and the values of the secret fuses are required to calculate the
response value expected by HOST2. The BurnSecure command can be used to burn an arbitrary
selection of these 64-bits.
These 23-fuses should be used to store information which is not secret, as their value can always be
determined using the read command. Typical usage would be model or configuration information. They
cannot be automatically included in the messages to be hashed by the HOST commands, but the
system may read them and pass them back to HOST1 in the input stream if desired.
This fuse is used to prevent access to fuses on chips in which a partial set of fuses has been burned.
This fuse must be burned using the BurnSecure command.
1.3 Chip Identification
The chip includes a total of 72-bits of information that can be used to distinguish between individual chips in a reliable manner.
The information is distributed between the ROM and fuse blocks in the following manner.
Serial Number
This 48-bit value is composed of ROM SN (16-bits) and Fuse SN (32-bits). Together they form a serial
number that is guaranteed to be unique for all devices ever manufactured within the
CryptoAuthentication family. This value is optionally included in the MAC calculation.
Manufacturing ID This 24-bit value is composed of ROM MfrID (16-bits) and Fuse MfrID (8-bits). Typically this value is
the same for all chips of a given type. It is always included in the cryptographic computations.
Atmel AT88SA10HS [DATASHEET]
3
8595G−CRYPTO−9/11
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