7.6.6.3 PUF Status Register
| Name: | PUF_SR |
| Offset: | 0x008 |
| Reset: | 0x00000001 |
| Property: | Read/Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| RESEEDR | RESEEDW | ||||||||
| Access | R/W | R/W | |||||||
| Reset | 0 | 0 |
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| Access | |||||||||
| Reset |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| Access | |||||||||
| Reset |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| DOREQ | DIREQ | REJECTED | ZEROIZED | ERROR | OK | BUSY | |||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | R/W | ||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
Bit 30 – RESEEDR Reseed Required
| Value | Name | Description |
|---|---|---|
| 0 | NO_ACTION | No action required. |
| 1 | REQUIRED_ACTION | The maximum number of DRBG2 requests has been done. A reseed must be performed before other operations can be done. This bit is the same as in PUF_ORR. |
Bit 29 – RESEEDW Reseed Warning
| Value | Name | Description |
|---|---|---|
| 0 | NO_ACTION | No action required. |
| 1 | RECOMMENDED_ACTION | The reseed counter of the DRBG is close to its limit, it is recommended to reseed at the first suitable moment. This bit is the same as in PUF_ORR. |
Bit 6 – DOREQ Data Out Request Status
| Value | Description |
|---|---|
| 0 | No data-out transfer is in progress. |
| 1 | A data-out transfer is in progress following a request via PUF_DOR. |
Bit 5 – DIREQ Data In Request Status
| Value | Description |
|---|---|
| 0 | No data-in transfer is in progress. |
| 1 | A data-in transfer is in progress following a request via PUF_DIR. |
Bit 4 – REJECTED Last Command Rejection Status (cleared by writing a 1)
| Value | Description |
|---|---|
| 0 | No rejection event occurred since the last clearing access. |
| 1 | A rejection event occurred when the last command has been launched. Cleared by writing a 1. |
Bit 3 – ZEROIZED PUF Zeroization in Progress
| Value | Description |
|---|---|
| 0 | No zeroization is in progress. |
| 1 | A zeroization action is in progress or the PUF is in Locked state. |
Bit 2 – ERROR Last Operation Failed
| Value | Description |
|---|---|
| 0 | The last operation completed successfully. |
| 1 | The last operation failed. |
Bit 1 – OK Last Operation Successfully Achieved
| Value | Description |
|---|---|
| 0 | ERROR bit must be checked. |
| 1 | The last operation completed successfully. |
Bit 0 – BUSY Operation in Progress
| Value | Description |
|---|---|
| 0 | No operation is in progress. A new operation can be initiated. |
| 1 | An operation is in progress. No new operation must be launched. |