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MPAMCFG_MBW_PROP, MPAM Memory Bandwidth Proportional Stride Partition Configuration Register

The MPAMCFG_MBW_PROP characteristics are:


MPAMCFG_MBW_PROP is a 32-bit read-write register that controls the maximum fraction of memory bandwidth that the PARTID selected by MPAMCFG_PART_SEL is permitted to use. MPAMCFG_MBW_PROP_s controls the bandwidth proportional stride for the Secure PARTID selected by the Secure instance of MPAMCFG_PART_SEL. MPAMCFG_MBW_PROP_ns controls the bandwidth proportional stride for the Non-secure PARTID selected by the Non-secure instance of MPAMCFG_PART_SEL.

A PARTID that has a current bandwidth usage of more than MAX is prevented from access to additional bandwidth if HARDLIM == 1 or if HARDLIM == 0, the PARTID is given additional bandwidth only if there are no requests from PARTIDs that have not exceeded their MAX.



This register is present only when MPAMF_IDR.HAS_MBW_PART == 1 and MPAMF_MBW_IDR.HAS_PROP == 1. Otherwise, direct accesses to MPAMCFG_MBW_PROP are RES0.


MPAMCFG_MBW_PROP is a 32-bit register.

Field descriptions

The MPAMCFG_MBW_PROP bit assignments are:


EN, bit [31]

Enable proportional stride bandwidth partitioning.


The selected partition is not regulated by proportional stride bandwidth partitioning.


The selected partition has bandwidth usage regulated by proportional stride bandwidth partitioning as controlled by STRIDEM1.

Bits [30:16]

Reserved, RES0.

STRIDEM1, bits [15:0]

Memory bandwidth stride minus 1 allocated to the partition selected by MPAMCFG_PART_SEL. STRIDEM1 represents the normalized cost of bandwidth consumption by the partition.

The proportional stride partitioning control parameter is an unsigned integer representing the normalized cost to a partition for consuming bandwidth. Larger values have a larger cost and correspond to a lesser allocation of bandwidth while smaller values indicate a lesser cost and therefore a higher allocation of bandwidth.

The implemented width of STRIDEM1 is given in MPAMF_MBW_IDR.BWA_WD.

Accessing the MPAMCFG_MBW_PROP

This register is within the MPAM feature page memory frames. In a system that supports Secure and Non-secure memory maps, there must be both Secure and Non-secure MPAM feature pages.

MPAMCFG_MBW_PROP_s must be accessible from the Secure MPAM feature page. MPAMCFG_MBW_PROP_ns must be accessible from the Non-secure MPAM feature page.

MPAMCFG_MBW_PROP_s and MPAMCFG_MBW_PROP_ns must be separate registers. The Secure instance (MPAMCFG_MBW_PROP_s) accesses the memory proportional stride bandwidth partitioning used for Secure PARTIDs, and the Non-secure instance (MPAMCFG_MBW_PROP_ns) accesses the memory proportional stride bandwidth partitioning used for Non-secure PARTIDs.

MPAMCFG_MBW_PROP can be accessed through the memory-mapped interfaces:


Accesses on this interface are RW.


Accesses on this interface are RW.