7.4.2 Bootloader Hardware Signature
Each frame received from the host (write or read frame) will be acknowledged with a 32-bit signature through the MISO signal. This is used to give the bootloader’s signature and the state of the system to the host.
This frame is composed of:
| Bit | Name | Value |
|---|---|---|
| 31..17 | BOOT_SIGN | 010101100011010 |
| 16 | RST_STATUS | USER_RST |
| 15 | CM7_RESET | |
| 14 | WDT_RESET | |
| 13 | BOOT_FUSE | — |
| 12 | CHIP_ID | — |
| 11 | RESERVED | — |
| 10 | HSM_FUSE | — |
| 9 | AES_FUSES | AES_DIS |
| 8 | AES_128 | |
| 7..2 | RESERVED | — |
| 1..0 | FREE_FUSES | — |