ATSGA204A View Datasheet(PDF) - Microchip Technology
Part Name
Description
MFG CO.
'ATSGA204A' PDF : 93 Pages View PDF
ATSHA204A
Security Commands
8.5.3
In most but not all cases, failing commands return relatively quickly, often well before the typical execution
time.
Table 8-4. Command Opcodes, Short Descriptions and Execution Times
Command Opcode Description
Typ. Exec. Max. Exec.
Time(1), ms Time(2), ms
DeriveKey
0x1C Derive a target key value from the target or parent key.
14
62
DevRev
0x30 Return device revision information.
0.4
2
GenDig
0x15
Generate a data protection digest from a random or input
seed and a key.
11
43
HMAC
0x11
Calculate response from key and other internal data using
HMAC/SHA-256.
27
69
CheckMac
0x28
Verify a MAC calculated on another Microchip
CryptoAuthentication device.
12
38
Lock
0x17 Prevent further modifications to a zone of the device.
5
24
MAC
0x08
Calculate response from key and other internal data using
SHA-256.
12
35
Nonce
0x16
Generate a 32-byte random number and an internally stored
nonce.
22
60
Pause
0x01
Selectively put just one device on a shared bus into the idle
state.
0.4
2
Random
0x1B Generate a random number.
11
50
Read
0x02
Read four bytes from the device, with or without
authentication and encryption.
0.4
4
SHA
0x47 Calculate a SHA256 digest for any system purpose.
11
22
UpdateExtra
0x20
Update bytes 84 or 85 within the Configuration zone after
the Configuration zone is locked.
8
12
Write
0x12
Write 4 or 32 bytes to the device, with or without
authentication and encryption.
4
42
Note:
1. Typical execution times are representative of the duration to execute the command assuming no
error conditions, fastest mode setting, no optional internal actions such as limited use keys and
favorable environmental conditions. For best performance, delay for this interval and then start
polling to determine actual command completion.
2. Maximum execution times are representative of the longest duration of a successful command
execution with all mode and internal actions enabled under extended statistical and environmental
conditions. Execution time may extend beyond these values in extreme situations.
Zone Encoding
The value in Param1 for both the Read command and the Write command controls which zone the
command accesses. See Section Configuration Zone Locking to obtain more information on what
controls the “locked” and “unlocked” states for each zone. All other zone values are reserved and should
not be used.
© 2018 Microchip Technology Inc.
DS40002025A-page 45
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