MPAMF_PRI_IDR MPAM Priority Partitioning Identification Register The power domain of MPAMF_PRI_IDR is IMPLEMENTATION DEFINED when (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p0 is implemented) and MPAMF_IDR.HAS_PRI_PART == '1' MPAM MPAMF_BASE_s 0x0048 MPAMF_PRI_IDR_s When FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented RO MPAM MPAMF_BASE_ns 0x0048 MPAMF_PRI_IDR_ns When FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented RO MPAM MPAMF_BASE_rt 0x0048 MPAMF_PRI_IDR_rt When FEAT_RME is implemented and (FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented) RO MPAM MPAMF_BASE_rl 0x0048 MPAMF_PRI_IDR_rl When FEAT_RME is implemented and (FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented) RO Indicates which MPAM priority partitioning features are present on this MSC. MPAM If MPAMF_IDR.HAS_RIS is 1, some fields in this register give information for the resource instance currently selected by MPAMCFG_PART_SEL.RIS. The description of every field affected by MPAMCFG_PART_SEL.RIS has information within the field description. If FEAT_MPAMv1p0 or FEAT_MPAMv0p1 is implemented, then the following statements apply: MPAMF_PRI_IDR_s indicates priority partitioning features accessed from the Secure MPAM feature page. MPAMF_PRI_IDR_ns indicates priority partitioning features accessed from the Non-secure MPAM feature page. If FEAT_RME is implemented, then the following statements also apply: MPAMF_PRI_IDR_rt indicates priority partitioning features accessed from the Root MPAM feature page. MPAMF_PRI_IDR_rl indicates priority partitioning features accessed from the Realm MPAM feature page. The power and reset domain of each MSC component is specific to that component. MPAMF_PRI_IDR is a 32-bit register. 31 26 31:26 Reserved, RES0. DSPRI_WD 25 20 25:20 Number of implemented bits in the downstream priority field (DSPRI) of MPAMCFG_PRI. If HAS_DSPRI == 1, this field must contain a value from 1 to 16, inclusive. If HAS_DSPRI == 0, this field must be 0. If RIS is implemented, this field indicates the number of downstream priority bits for the resource instance selected by MPAMCFG_PART_SEL.RIS. This field has an IMPLEMENTATION DEFINED value. RO 19 18 19:18 Reserved, RES0. DSPRI_0_IS_LOW 17 17 17 Indicates whether 0 in MPAMCFG_PRI.DSPRI is the lowest or the highest downstream priority. If RIS is implemented, this field indicates that 0 is the lowest downstream priority for the resource instance selected by MPAMCFG_PART_SEL.RIS. 0b0 In the MPAMCFG_PRI.DSPRI field, a value of 0 means the highest priority. 0b1 In the MPAMCFG_PRI.DSPRI field, a value of 0 means the lowest priority. RO HAS_DSPRI 16 16 16 Indicates that the MPAMCFG_PRI register implements the DSPRI field. If RIS is implemented, this field indicates that downstream priority is implemented for the resource instance selected by MPAMCFG_PART_SEL.RIS. 0b0 This MSC supports priority partitioning, but does not implement a downstream priority (DSPRI) field in the MPAMCFG_PRI register. 0b1 This MSC supports downstream priority partitioning and implements the downstream priority (DSPRI) field in the MPAMCFG_PRI register. RO 15 10 15:10 Reserved, RES0. INTPRI_WD 9 4 9:4 Number of implemented bits in the internal priority field (INTPRI) in the MPAMCFG_PRI register. If HAS_INTPRI == 1, this field must contain a value from 1 to 16, inclusive. If HAS_INTPRI == 0, this field must be 0. If RIS is implemented, this field indicates the number of internal priority bits for the resource instance selected by MPAMCFG_PART_SEL.RIS. This field has an IMPLEMENTATION DEFINED value. RO 3 2 3:2 Reserved, RES0. INTPRI_0_IS_LOW 1 1 1 Indicates whether 0 in MPAMCFG_PRI.INTPRI is the lowest or the highest internal priority. If RIS is implemented, this field indicates that 0 is the lowest internal priority for the resource instance selected by MPAMCFG_PART_SEL.RIS. 0b0 In the MPAMCFG_PRI.INTPRI field, a value of 0 means the highest priority. 0b1 In the MPAMCFG_PRI.INTPRI field, a value of 0 means the lowest priority. RO HAS_INTPRI 0 0 0 Indicates that this MSC implements the INTPRI field in the MPAMCFG_PRI register. If RIS is implemented, this field indicates that internal priority is implemented for the resource instance selected by MPAMCFG_PART_SEL.RIS. 0b0 This MSC supports priority partitioning, but does not implement the internal priority (INTPRI) field in the MPAMCFG_PRI register. 0b1 This MSC supports internal priority partitioning and implements the internal priority (INTPRI) field in the MPAMCFG_PRI register. RO If both FEAT_MPAM and FEAT_RME are implemented, the following statements apply: In a system that supports Secure, Non-secure, Root, and Realm memory maps, there must be MPAM feature pages in all four address maps. MPAMF_PRI_IDR must be readable from the Non-secure, Secure, Root, and Realm MPAM feature pages. MPAMF_PRI_IDR is permitted to have the same contents when read from the Secure, Non-secure, Root, and Realm MPAM feature pages unless the register contents are different for the different versions: MPAMF_PRI_IDR_s is permitted to have either the same or different contents to MPAMF_PRI_IDR_ns, MPAMF_PRI_IDR_rt, or MPAMF_PRI_IDR_rl. MPAMF_PRI_IDR_ns is permitted to have either the same or different contents to MPAMF_PRI_IDR_rt or MPAMF_PRI_IDR_rl. MPAMF_PRI_IDR_rt is permitted to have either the same or different contents to MPAMF_PRI_IDR_rl. There must be separate registers in the Secure (MPAMF_PRI_IDR_s), Non-secure (MPAMF_PRI_IDR_ns), Root (MPAMF_PRI_IDR_rt), and Realm (MPAMF_PRI_IDR_rl) MPAM feature pages. If any one of these features is implemented: FEAT_MPAMv0p1 FEAT_MPAMv1p1 then, the following statements apply: When MPAMF_IDR.HAS_RIS is 1, MPAMF_PRI_IDR shows the configuration of priority partitioning for the resource instance selected by MPAMCFG_PART_SEL.RIS. Fields that mention RIS in their field descriptions have values that track the implemented properties of the resource instance. Fields that do not mention RIS are constant across all resource instances. 2026-03-26 20:27:25 2026-03_rel