54.5.14 AES GCM Authentication Tag Word Register x

Name: AES_TAGRx
Offset: 0x88 + x*0x04 [x=0..3]
Reset: 0x00000000
Property: Read-only

Bit 3130292827262524 
 TAG[31:24] 
Access RRRRRRRR 
Reset 00000000 
Bit 2322212019181716 
 TAG[23:16] 
Access RRRRRRRR 
Reset 00000000 
Bit 15141312111098 
 TAG[15:8] 
Access RRRRRRRR 
Reset 00000000 
Bit 76543210 
 TAG[7:0] 
Access RRRRRRRR 
Reset 00000000 

Bits 31:0 – TAG[31:0] GCM Authentication Tag x

The four 32-bit Tag registers contain the final 128-bit GCM Authentication tag (T) when GCM processing is complete. TAG0 corresponds to the first word, TAG3 to the last word.