ATSGA204A データシートの表示（PDF） - Microchip Technology
部品番号
コンポーネント説明
メーカー
ATSGA204A Datasheet PDF : 93 Pages
| |||
ATSHA204A
Device Organization
Bit Name
7 IsSecret
Description
0=
The slot is not secret and allows clear read, clear write, no MAC check and no
Derivekey Command.
1 = The slot is secret. Reads and writes if allowed, must be encrypted.
0 = Clear reads are permitted.
6 EncryptRead
1 = Requires the slot to be Secret and encrypted read to access.
0 = No limit on the number of time the key can be used.
5
LimitedUse(1)
1=
Limit on the number of time the key can be used based on the UseFlag (or
LastKeyUse) for the slot.
4 CheckOnly
3-0 ReadKey
0 = This slot can be used for all crypto commands.
1=
This slot can only be used for CheckMac and GenDig followed by
Commands.
CheckMac
Slot of the key to be used for encrypted reads.
If 0x0, then this slot can be used as the source slot for the CheckMac/Copy Command.
Note:
1. LimitedUse bit was previously named SingleUse.
Table 2-6. Write Configuration Bits — Derivekey Command
Bit 15 Bit 14 Bit 13 Bit 12 Source Key(1) Description
0
X
1
0
Target
DeriveKey command can be run without authorizing MAC (Roll).
1
X
1
0
Target
Authorizing MAC required for DeriveKey command (Roll).
0
X
1
1
Parent
DeriveKey command can be run without authorizing MAC
(Create).
1
X
1
1
Parent
Authorizing MAC required for DeriveKey command (Create).
X
X
0
X
—
Slots with this value in the WriteConfig field may not be used as the
target of the DeriveKey command.
Note:
1. The source key for the computation performed by the DeriveKey command can either be the key
directly specified in Param2 (the “Target”) or the key at SlotConfig<Param2>. WriteKey (the
“Parent”).
See Section Key Values for more details.
© 2018 Microchip Technology Inc.
DS40002025A-page 13
Share Link: 