55.5.15 TDES Write Protection Status Register


Bit	31	30	29	28	27	26	25	24
	ECLASS				SWETYP[3:0]
Access	R				R	R	R	R
Reset	0				0	0	0	0


Bit	23	22	21	20	19	18	17	16
	WPVSRC[15:8]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	WPVSRC[7:0]
Access	R	R	R	R	R	R	R	R
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
				PKRPVS	SWE	SEQE	CGD	WPVS
Access				R	R	R	R	R
Reset				0	0	0	0	0

Bit 31 – ECLASS Software Error Class (cleared on read)

Value	Name	Description
0	WARNING	An abnormal access that does not affect system functionality.
1	ERROR	An access is performed into key, input data, control registers while the TDES is performing an encryption/decryption or a start is request by software or DMA while the key is not fully configured.

Bits 27:24 – SWETYP[3:0] Software Error Type (cleared on read)

Value	Name	Description
0	READ_WO	A write-only register has been read (Warning).
1	WRITE_RO	TDES is enabled and a write access has been performed on a read-only register (Warning).
2	UNDEF_RW	Access to an undefined address (Warning).
3	CTRL_START	Abnormal use of TDES_CR.START command when DMA access is configured.
4	WEIRD_ACTION	A key write, init value write, output data read, Mode register write, Private Key bus access or XTEA round register has been performed while a current processing is in progress (abnormal).
5	INCOMPLETE_KEY	A tentative of start is required while the keys are not fully loaded into TDES_KEYxWRy.

Bits 23:8 – WPVSRC[15:0] Write Protection Violation Source (cleared on read)

When WPVS = 1, WPVSRC indicates the register address offset at which a write access has been attempted.

When WPVS=0 and SWE=1, WPVSRC reports the address of the incorrect software access. As soon as WPVS=1, WPVSRC returns the address of the write-protected violation.

Bit 4 – PKRPVS Private Key Register Protection Violation Status (cleared on read)

Value	Description
0	No Private Key internal register access violation has occurred since the last read of TDES_WPSR.
1	A Private Key internal register access violation has occurred since the last read of TDES_WPSR.

Bit 3 – SWE Software Control Error (cleared on read)

Value	Description
0	No software error has occurred since the last read of TDES_WPSR.
1	A software error has occurred since the last read of TDES_WPSR. The field SWETYP details the type of software error; the associated incorrect software access is reported in the field WPVSRC (if WPVS=0).

Bit 2 – SEQE Internal Sequencer Error (cleared on read)

Value	Description
0	No peripheral internal sequencer error has occurred since the last read of TDES_WPSR.
1	A peripheral internal sequencer error has occurred since the last read of TDES_WPSR. This flag is set under abnormal operating conditions.

Bit 1 – CGD Clock Glitch Detected (cleared on read)

Value	Description
0	The clock monitoring circuitry has not been corrupted since the last read of TDES_WPSR. Under normal operating conditions, this bit is always cleared.
1	The clock monitoring circuitry has been corrupted since the last read of TDES_WPSR. This flag is set in case of abnormal clock signal waveform (glitch).

Bit 0 – WPVS Write Protection Violation Status (cleared on read)

Value	Description
0	No write protection violation has occurred since the last read of TDES_WPSR.
1	A write protection violation has occurred since the last read of TDES_WPSR. If this violation is an unauthorized attempt to write a protected register, the associated violation is reported into field WPVSRC.

Name:	TDES_WPSR
Offset:	0xE8
Reset:	0x00000000
Property:	Read/Write