13.5 IDAU Programmable Regions

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A Programmable region is considered secure or non-secure (i.e. exempt) based on a user programmable security attribute. Bus requests to an address that falls within a programmable region are rejected with a slave bus error under the following condition

• request is non-secure (NONSEC=1) and the region is programmed as secure RSTATUSBn.NONSEC= 0.

All other combinations are accepted.

For this type of region, the RSTATUSAn.Type=2 and RSTATUSBn.NONSEC reflects the security state of the region, where n is a value between from 1 to STATUS.NBRG. The lower address of the region is given by RSTATUSAn.ADDR[31:10] * 2¹⁰ and the upper address by RSTATUSAn.ADDR[31:10] * 2¹⁰ + 2^{RSTATUSAn.SIZE} - 1, when RSTATUSAn.SIZE is greater than 0.

Program the security state through the RCTRL register by issuing the NONSEC or SEC command. This region is only active when CTRLA.ENABLE=1, otherwise it is treated as an exempt address range.