60.5.6 AES Interrupt Status Register

Name:	AES_ISR
Offset:	0x1C
Reset:	0x00000000
Property:	Read-only


Bit	31	30	29	28	27	26	25	24

Access
Reset


Bit	23	22	21	20	19	18	17	16
						PLENERR	EOPAD	TAGRDY
Access						R	R	R
Reset						0	0	0


Bit	15	14	13	12	11	10	9	8
	URAT[3:0]							URAD
Access	R	R	R	R				R
Reset	0	0	0	0				0


Bit	7	6	5	4	3	2	1	0
								DATRDY
Access								R
Reset								0

Bit 18 – PLENERR Padding Length Error

Value	Description
0	No Padding Length Error occurred.
1	Padding Length Error detected.

Bit 17 – EOPAD End of Padding

Value	Description
0	Padding is not over.
1	Padding phase is over.

Bit 16 – TAGRDY GCM Tag Ready

Value	Description
0	GCM Tag is not valid.
1	GCM Tag generation is complete (cleared by reading GCM Tag, starting another processing or when writing a new key).

Bits 15:12 – URAT[3:0] Unspecified Register Access (cleared by writing SWRST in AES_CR)

Only the last Unspecified Register Access Type is available through the URAT field.

Value	Name	Description
0	IDR_WR_PROCESSING	Input Data register written during the data processing when SMOD = 2 mode.
1	ODR_RD_PROCESSING	Output Data register read during the data processing.
2	MR_WR_PROCESSING	Mode register written during the data processing.
3	ODR_RD_SUBKGEN	Output Data register read during the sub-keys generation.
4	MR_WR_SUBKGEN	Mode register written during the sub-keys generation.
5	WOR_RD_ACCESS	Write-only register read access.

Bit 8 – URAD Unspecified Register Access Detection Status (cleared by writing SWRST in AES_CR)

Value	Description
0	No unspecified register access has been detected since the last SWRST.
1	At least one unspecified register access has been detected since the last SWRST.

Bit 0 – DATRDY Data Ready (cleared by setting bit START or bit SWRST in AES_CR or by reading AES_ODATARx)

Note: If AES_MR.LOD = 1: In Manual and Auto mode, the DATRDY flag can also be cleared by writing at least one AES_IDATARx.

Value	Description
0	Output data not valid.
1	Encryption or decryption process is completed.