AT88SA10HS-TSU-T(2010) 데이터 시트보기 (PDF) - Atmel Corporation

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AT88SA10HS-TSU-T
(Rev.:2010)

Atmel CryptoAuthentication Host Security Chip

Atmel Corporation 

5. Commands

The command packet is broken down in the following way:

Byte

0

1

2-3

4+

Name

Opcode

Param1

Param2

Data

Meaning

The Command code

The first parameter – always present

The second parameter – always present

Optional remaining input data

If a command fails because the CRC within the block is incorrect or there is some other communications error,

then immediately after tPARSE the system will be able to retrieve an error response block containing a single byte

packet. The value of that byte will be all ones. In this situation, the system should re-transmit the command block

including the proceeding Transmit flag – providing there is sufficient time before the expiration of the watchdog

timeout.

If the opcode is invalid, one of the parameters is illegal, or the Atmel® AT88SA10HS is in an illegal state for the

execution of this command, then immediately after tPARSE the system will be able to retrieve an error response

block containing a single byte packet. The value of that byte will be 0x0F. In this situation, the condition must be

corrected before the (modified) command is sent back to the AT88SA10HS.

If a command is received successfully, the system will be able to retrieve the output block as described in the

individual command descriptions below after the appropriate execution delay.

In the individual command description tables following, the “Size” column describes the number of bytes in the

parameter documented in each particular row. The total size of the block for each of the commands is fixed,

though that value is different for each command. If the block size for a particular command is incorrect, the chip

will not attempt the command execution and returns an error.

5.1.

HOST0

Concatenates the key stored in AT88SA10HS with an input 256-bit challenge and generates the digest of this

message. The result is left in internal memory and cannot be read. In general, the challenge should be a random

number generated by the host system, which will be sent to both the host (AT88SA10HS) and client (Atmel

AT88SA100S or Atmel AT88SA102S).

Table 5-1. Input Parameters

Name

Size Notes

Opcode HOST0

1 0x08

Param1 Overwrite

1 If non-zero, overwrite part of internally generated key with secret fuses

Param2 KeyID

2 The internal key to be used to generate the digest

Data

Challenge

32 Challenge to be sent to the client Atmel AT88SA100S or Atmel AT88SA102S

Table 5-2. Output Parameters

Name

Size Notes

Success

1 Upon successful completion of HOST0, a value of zero will be returned by Atmel AT88SA10HS

12 Atmel AT88SA10HS Host Authentication Chip

8595F–SMEM–8/10

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