MPAMCFG_MBW_PBM<n> MPAM Bandwidth Portion Bitmap Partition Configuration Register The power domain of MPAMCFG_MBW_PBM<n> is IMPLEMENTATION DEFINED when (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p0 is implemented), MPAMF_IDR.HAS_MBW_PART == '1', and MPAMF_MBW_IDR.HAS_PBM == '1' 0 127 MPAM MPAMF_BASE_s 0x2000 + (4 * n) MPAMCFG_MBW_PBM<n>_s When FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented RW MPAM MPAMF_BASE_ns 0x2000 + (4 * n) MPAMCFG_MBW_PBM<n>_ns When FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented RW MPAM MPAMF_BASE_rt 0x2000 + (4 * n) MPAMCFG_MBW_PBM<n>_rt When FEAT_RME is implemented and (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p0 is implemented) RW MPAM MPAMF_BASE_rl 0x2000 + (4 * n) MPAMCFG_MBW_PBM<n>_rl When FEAT_RME is implemented and (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p0 is implemented) RW The MPAMCFG_MBW_PBM<n> register array gives access to the memory bandwidth portion bitmap. Each register in the array is a read/write register that configures whether a PARTID is allowed to allocate bandwidth portions within a range. The range of portions covered in MPAMCFG_MBW_PBM<n> is from portion <32*n> to portion <32*n +31>. After setting MPAMCFG_PART_SEL with a PARTID, software writes to one or more of the MPAMCFG_MBW_PBM<n> registers to configure with bandwidth portions the PARTID is allowed to allocate. The MPAMCFG_MBW_PBM<n> register that contains the bitmap bit corresponding to memory bandwidth portion p has n equal to p[11:5]. The field, P<x> of that MPAMCFG_MBW_PBM<n> register that contains the bitmap bit corresponding to memory bandwidth portion p has <x> equal to p[4:0]. MPAM If MPAMF_IDR.HAS_RIS is 1, the control settings accessed are those of the resource instance currently selected by MPAMCFG_PART_SEL.RIS and the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL. If FEAT_MPAMv0p1 or FEAT_MPAMv1p0 is implemented, then the following statements apply: The MPAMCFG_MBW_PBM<n>_s registers control the bandwidth portion bitmap for the Secure PARTID selected by the Secure instance of MPAMCFG_PART_SEL. The MPAMCFG_MBW_PBM<n>_ns registers control the bandwidth portion bitmap for the Non-secure PARTID selected by the Non-secure instance of MPAMCFG_PART_SEL. If FEAT_RME is implemented, then the following statements also apply: The MPAMCFG_MBW_PBM<n>_rt registers control the bandwidth portion bitmap for the Root PARTID selected by the Root instance of MPAMCFG_PART_SEL. The MPAMCFG_MBW_PBM<n>_rl registers control the bandwidth portion bitmap for the Realm PARTID selected by the Realm instance of MPAMCFG_PART_SEL. The power and reset domain of each MSC component is specific to that component. MPAMCFG_MBW_PBM<n> is a 32-bit register. P<x> 31 0 31:0 Portion allocation control bit. Each bandwidth portion allocation control bit MPAMCFG_MBW_PBM<n>.P<x> grants permission to the PARTID selected by MPAMCFG_PART_SEL to allocate bandwidth within bandwidth portion <32*n> + <x>. The number of bits in the bandwidth portion partitioning bit map of this component is given in MPAMF_MBW_IDR.BWPBM_WD. BWPBM_WD contains a value from 1 to 2¹², inclusive. Values of MPAMF_MBW_IDR.BWPBM_WD greater than 32 require a group of 32-bit registers to access the bandwidth portion bitmap, up to 128 32-bit registers. 31 0 0b0 The PARTID is not permitted to allocate into bandwidth portion <32*n> + <x>. 0b1 The PARTID is permitted to allocate within bandwidth portion <32*n> + <x>. When (n * 32) + x > UInt(MPAMF_MBW_IDR().BWPBM_WD) RES0 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: MPAMCFG_MBW_PBM<n>_s must only be accessible from the Secure MPAM feature page. MPAMCFG_MBW_PBM<n>_ns must only be accessible from the Non-secure MPAM feature page. MPAMCFG_MBW_PBM<n>_rt must only be accessible from the Root MPAM feature page. MPAMCFG_MBW_PBM<n>_rl must only be accessible from the Realm MPAM feature page. MPAMCFG_MBW_PBM<n>_s, MPAMCFG_MBW_PBM<n>_ns, MPAMCFG_MBW_PBM<n>_rt, and MPAMCFG_MBW_PBM<n>_rl must be separate registers: The Secure instance (MPAMCFG_MBW_PBM<n>_s) accesses the memory bandwidth portion bitmap used for Secure PARTIDs. The Non-secure instance (MPAMCFG_MBW_PBM<n>_ns) accesses the memory bandwidth portion bitmap used for Non-secure PARTIDs. The Root instance (MPAMCFG_MBW_PBM<n>_rt) accesses the memory bandwidth portion bitmap used for Root PARTIDs. The Realm instance (MPAMCFG_MBW_PBM<n>_rl) accesses the memory bandwidth portion bitmap used for Realm PARTIDs. When RIS is implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the bandwidth resource instance selected by MPAMCFG_PART_SEL.RIS and the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL. When RIS is not implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL. When PARTID narrowing is implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the internal PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 1. When PARTID narrowing is not implemented, loads and stores to MPAMCFG_MBW_PBM<n> access the memory bandwidth portion bitmap configuration settings for the request PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 0. 2026-03-26 20:27:25 2026-03_rel