AT88SA10HS_10 ATMEL [ATMEL Corporation], AT88SA10HS_10 Datasheet - Page 14

• Manufacturer Part Number: AT88SA10HS_10
• Description: Atmel CryptoAuthentication Host Security Chip
• Manufacturer: ATMEL [ATMEL Corporation]

5.2.1.1.
5.3.
14
The contents of the second block to be digested are listed below.
Note:
These bits are followed by the necessary ‘1’ bit, ‘0’ padding and 64-bit length as specified in the SHA-256
specification.
Bit five of the mode is used to indicate whether or not the secret fuse bits are to be included in the calculation.
The remaining bits of the mode field are ignored by Atmel
Table 5-5.
If Fuse[87] has not been burned, then the values of Fuse[0-63] will be replaced by zeros in the above message
generation step as a security measure.
HOST2
Compares the value previously generated by the AT88SA10HS using HOST0 and HOST1 with that on the input
stream coming from the client and returns status to indicate whether or not the two matched. This command
returns an error if HOST1 has not been previously successfully run within this Wake cycle.
If the two digests do not match, the AT88SA10HS provides no information as to the source of the mismatch,
which must be deduced from the inputs to the three HOSTX commands. On a match failure, the entire set of
HOST0, HOST1 & HOST2 commands must be re-executed – HOST2 cannot be repeatedly executed.
Atmel AT88SA10HS Host Authentication Chip
Size
1 6-bits
32-bits
64-bits
24-bits
32-bits
16-bits
8-bits
Mode Encoding
Bit[5]
0
1
To simplify this documentation; the bit addresses for OtherInfo are listed in the table below
Source
OtherInfo[0-31]
Fuse[0-63]
OtherInfo[32-55]
Fuse[88-95]
OtherInfo[56-87]
ROM MfrID
OtherInfo[88-103]
Mode Encoding
Fuse Block
No fuse values inserted
Insert the values of Fuse[0-63] in the message
Notes
Opcode, param1 & param 2 values sent to Atmel AT88SA100S/AT88SA102S
If enabled by bit five of the input mode parameter and if Fuse[87] is burned, else forced to
zero
Status fuse values from Atmel ATSA100S/AT88SA102S, or zeros
Fuse MfrID, should match between Atmel AT88SA10HS and Atmel
AT88SA100S/AT88SA102S
Fuse SN from Atmel AT88SA100S/AT88SA102S (Fuse[96-127]), or zeros
Should match between Atmel AT88SA10HS and Atmel AT88SA100S/AT88SA102S
ROM SN from Atmel AT88SA100S/AT88SA102S, or zeros
®
AT88SA10HS and should be zero.
8595F–SMEM–8/10