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MPAMCFG_INTPARTID

MPAMCFG_INTPARTID, MPAM Internal PARTID Narrowing Configuration Register

The MPAMCFG_INTPARTID characteristics are:

Purpose

MPAMCFG_INTPARTID is a 32-bit read/write register that controls the mapping of the PARTID selected by MPAMCFG_PART_SEL into a narrower internal PARTID (intPARTID).

The MPAMCFG_INTPARTID register associates the request PARTID (reqPARTID) in the MPAMCFG_PART_SEL register with an internal PARTID (intPARTID) in this register. To set that association, store reqPARTID into the MPAMCFG_PART_SEL register and then store the intPARTID into the MPAMCFG_INTPARTID register. To read the association, store reqPARTID into the MPAMCFG_PART_SEL register and then read MPAMCFG_INTPARTID.

Configuration

The power domain of MPAMCFG_INTPARTID is IMPLEMENTATION DEFINED.

This register is present only when (FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p0 is implemented) and MPAMF_IDR.HAS_PARTID_NRW == '1'. Otherwise, direct accesses to MPAMCFG_INTPARTID are RES0.

If FEAT_MPAMv0p1 or FEAT_MPAMv1p0 is implemented, then the following statements apply:

MPAMCFG_INTPARTID_s controls the mapping for the Secure PARTID selected by the Secure instance of MPAMCFG_PART_SEL.
MPAMCFG_INTPARTID_ns controls the mapping 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:
- MPAMCFG_INTPARTID_rt controls the mapping for the Root PARTID selected by the Root instance of MPAMCFG_PART_SEL.
- MPAMCFG_INTPARTID_rl controls the mapping 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.

Attributes

MPAMCFG_INTPARTID is a 32-bit register.

Field descriptions

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
RES0															INTERNAL	INTPARTID

Bits [31:17]

Reserved, RES0.

INTERNAL, bit [16]

Internal PARTID flag.

This bit must be 1 when written to the register. If written as 0, the write will not update the reqPARTID to intPARTID association.

If the intPARTID stored into MPAMCFG_INTPARTID is out-of-range or does not have the INTERNAL bit set, the association of reqPARTID to intPARTID is not written and MPAMF_ESR is set to indicate an intPARTID_Range error.

If MPAMCFG_PART_SEL.INTERNAL is 1 when MPAMCFG_INTPARTID is read or written, MPAMF_ESR is set to indicate an Unexpected_INTERNAL error.

On a read of this register, the bit will always read the value last written.

INTPARTID, bits [15:0]

This field contains the intPARTID mapped to the reqPARTID in MPAMCFG_PART_SEL.

The maximum intPARTID supported is MPAMF_PARTID_NRW_IDR.INTPARTID_MAX.

Accessing MPAMCFG_INTPARTID

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_INTPARTID_s must only be accessible from the Secure MPAM feature page.
MPAMCFG_INTPARTID_ns must only be accessible from the Non-secure MPAM feature page.
MPAMCFG_INTPARTID_rt must only be accessible from the Root MPAM feature page.
MPAMCFG_INTPARTID_rl must only be accessible from the Realm MPAM feature page.
MPAMCFG_INTPARTID_s, MPAMCFG_INTPARTID_ns, MPAMCFG_INTPARTID_rt, and MPAMCFG_INTPARTID_rl must be separate registers:
The Secure instance (MPAMCFG_INTPARTID_s) accesses the PARTID narrowing used for Secure PARTIDs.
The Non-secure instance (MPAMCFG_INTPARTID_ns) accesses the PARTID narrowing used for Non-secure PARTIDs.
The Root instance (MPAMCFG_INTPARTID_rt) accesses the PARTID narrowing used for Root PARTIDs.
The Realm instance (MPAMCFG_INTPARTID_rl) accesses the PARTID narrowing used for Realm PARTIDs.

When RIS is implemented, loads and stores to MPAMCFG_INTPARTID access the PARTID narrowing configuration settings without being affected by MPAMCFG_PART_SEL.RIS.

Loads and stores to MPAMCFG_INTPARTID access the PARTID narrowing configuration settings for the request PARTID selected by MPAMCFG_PART_SEL.PARTID_SEL, and MPAMCFG_PART_SEL.INTERNAL must be 0.

MPAMCFG_INTPARTID can be accessed through the memory-mapped interfaces:

Component	Frame	Offset	Instance
MPAM	MPAMF_BASE_s	0x0600	MPAMCFG_INTPARTID_s

When FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented, accesses to this register are RW.

Component	Frame	Offset	Instance
MPAM	MPAMF_BASE_ns	0x0600	MPAMCFG_INTPARTID_ns

When FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented, accesses to this register are RW.

Component	Frame	Offset	Instance
MPAM	MPAMF_BASE_rt	0x0600	MPAMCFG_INTPARTID_rt

When FEAT_RME is implemented and (FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented), accesses to this register are RW.

Component	Frame	Offset	Instance
MPAM	MPAMF_BASE_rl	0x0600	MPAMCFG_INTPARTID_rl

When FEAT_RME is implemented and (FEAT_MPAMv1p0 is implemented or FEAT_MPAMv0p1 is implemented), accesses to this register are RW.

2026-03-26 20:27:25, 2026-03_rel