AES hardware accelerator (AES) RM0453
684/1450 RM0453 Rev 5
Bits 14:13 GCMPH[1:0]: GCM or CCM phase selection
This bitfield selects the phase of GCM, GMAC or CCM algorithm:
00: Init phase
01: Header phase
10: Payload phase
11: Final phase
The bitfield has no effect if other than GCM, GMAC or CCM algorithms are selected (through the
ALGOMODE bitfield).
Bit 12 DMAOUTEN: DMA output enable
This bit enables/disables data transferring with DMA, in the output phase:
0: Disable
1: Enable
When the bit is set, DMA requests are automatically generated by AES during the output data
phase. This feature is only effective when Mode 1 or Mode 3 is selected through the MODE[1:0]
bitfield. It is not effective for Mode 2 (key derivation).
Bit 11 DMAINEN: DMA input enable
This bit enables/disables data transferring with DMA, in the input phase:
0: Disable
1: Enable
When the bit is set, DMA requests are automatically generated by AES during the input data phase.
This feature is only effective when Mode 1 or Mode 3 is selected through the MODE[1:0] bitfield. It is
not effective for Mode 2 (key derivation).
Bit 10 ERRIE: Error interrupt enable
This bit enables or disables (masks) the AES interrupt generation when RDERR and/or WRERR is
set:
0: Disable (mask)
1: Enable
Bit 9 CCFIE: CCF interrupt enable
This bit enables or disables (masks) the AES interrupt generation when CCF (computation complete
flag) is set:
0: Disable (mask)
1: Enable
Bit 8 ERRC: Error flag clear
Upon written to 1, this bit clears the RDERR and WRERR error flags in the AES_SR register:
0: No effect
1: Clear RDERR and WRERR flags
Reading the flag always returns zero.
Bit 7 CCFC: Computation complete flag clear
Upon written to 1, this bit clears the computation complete flag (CCF) in the AES_SR register:
0: No effect
1: Clear CCF
Reading the flag always returns zero.
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