# Security Attribution Unit

Address | Register Name | Register Write | Register Read | Default | Description
--- | --- | --- | --- | --- | ---
0xE000EDD0 | SAU_CTRL | (1) ALLNS | (1) ALLNS | 0x0 | All non-secure
|  | (0) ENABLE | (0) ENABLE | 0x0 | Enable the SAU
0xE000EDD4 | SAU_TYPE | - | (7:0) NBR_OF_REGION | 0x4 | Number of region implemented by the SAU
0xE000EDD8 | SAU_RNR | (7:0) SEL_REGION | (7:0) SEL_REGION | 0x0 | Selects the region currently accessed by SAU_RBAR and SAU_RLAR
0xE000EDDC | SAU_RBAR | (31:5) BASE_ADDRESS | (31:5) BASE_ADDRESS | 0x0 | Base address
0xE000EDE0 | SAU_RLAR | (31:5) LIMIT_ADDRESS | (31:5) LIMIT_ADDRESS | 0x0 | Limit address
0xE000EDE4 | SAU_SFSR | - | (7) LSERR | 0x0 | Lazy state error flag
|  | - | (6) SFARVALID | 0x0 | Secure fault address valid
|  | - | (5) LSPERR | 0x0 | Lazy state preservation error flag
|  | - | (4) INVTRAN | 0x0 | Invalid transition flag
|  | - | (3) AUVIOL | 0x0 | Attribution unit violation flag
|  | - | (2) INVER | 0x0 | Invalid exception return flag
|  | - | (1) INVIS | 0x0 | Invalid integrity signature flag
|  | - | (0) INVEP | 0x0 | Invalid entry point
0xE000EDE8 | SAU_SFAR | - | (31:0) ADDRESS | 0x0 | Address