7.2.5.22 AES Write Protection Status Register

Name: AES_WPSR
Offset: 0xE8
Reset: 0x00000000
Property: Read-only

Bit 3130292827262524 
 ECLASS   SWETYP[3:0] 
Access RRRRR 
Reset 00000 
Bit 2322212019181716 
          
Access  
Reset  
Bit 15141312111098 
 WPVSRC[7:0] 
Access RRRRRRRR 
Reset 00000000 
Bit 76543210 
    PKRPVSSWESEQECGDWPVS 
Access RRRRR 
Reset 00000 

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

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 AES 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)

ValueNameDescription
0 READ_WO

A write-only register has been read (Warning).

1 WRITE_RO

AES 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 AES_CR.START command when DMA access is configured.

4 WEIRD_ACTION

A key write, init value write, output data read, AES_MR and AES_EMR write, GCM configuration registers write, AES_TWRx and AES_ALPHARx registers write, AES_BCNT write, Private Key Bus access has been performed while a current processing is in progress (abnormal).

5 INCOMPLETE_KEY

A tentative of start is required while the key is not fully loaded into the AES_KEYWRx registers.

Bits 15:8 – WPVSRC[7:0] Write Protection Violation Source

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 Internal Register Protection Violation Status (cleared on read)

ValueDescription
0

No Private Key Internal Register access violation has occurred since the last read of AES_WPSR.

1

A Private Key Internal Register access violation has occurred since the last read of AES_WPSR.

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

ValueDescription
0

No software error has occurred since the last read of AES_WPSR.

1

A software error has occurred since the last read of AES_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)

ValueDescription
0

No peripheral internal sequencer error has occurred since the last read of AES_WPSR.

1

A peripheral internal sequencer error has occurred since the last read of AES_WPSR. This flag can only be set under abnormal operating conditions.

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

ValueDescription
0

The clock monitoring circuitry has not been corrupted since the last read of AES_WPSR. Under normal operating conditions, this bit is always cleared.

1

The clock monitoring circuitry has been corrupted since the last read of AES_WPSR. This flag can only be set in case of abnormal clock signal waveform (glitch).

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

ValueDescription
0

No write protect violation has occurred since the last read of AES_WPSR.

1

A write protect violation has occurred since the last read of AES_WPSR. The address offset of the violated register is reported into field WPVSRC.