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# MPAMCFG_MBW_PROP, MPAM Memory Bandwidth Proportional Stride Partition Configuration Register

The MPAMCFG_MBW_PROP characteristics are:

## Purpose

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.

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.

## Configuration

The power domain of MPAMCFG_MBW_PROP is IMPLEMENTATION DEFINED.

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 IMPLEMENTATION DEFINED.

## Attributes

MPAMCFG_MBW_PROP is a 32-bit register.

## Field descriptions

The MPAMCFG_MBW_PROP bit assignments are:

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
EN | RES0 | STRIDEM1

#### EN, bit [31]

Enable proportional stride bandwidth partitioning.

EN | Meaning
--- | ---
0b0 | The selected partition is not regulated by proportional stride bandwidth partitioning.
0b1 | 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 part of the MPAMF_BASE memory frame. In a system that supports Secure and Non-secure memory maps, the MPAMF_BASE frame must be accessible in both Secure and Non-secure memory address maps.

MPAMCFG_MBW_PROP must be accessible from the Non-secure and Secure address maps.

MPAMCFG_MBW_PROP must be banked for the Secure and Non-secure address maps. The Secure instance accesses the memory proportional stride bandwidth partitioning used for Secure PARTIDs, and the Non-secure instance accesses the memory proportional stride bandwidth partitioning used for Non-secure PARTIDs.

#### MPAMCFG_MBW_PROP can be accessed through the memory-mapped interfaces:

Component | Frame | Offset | Instance
--- | --- | --- | ---
MPAM.any | MPAMF_BASE_s | 0x0500 | MPAMCFG_MBW_PROP_s

Access on this interface is RW.

Component | Frame | Offset | Instance
--- | --- | --- | ---
MPAM.any | MPAMF_BASE_ns | 0x0500 | MPAMCFG_MBW_PROP_ns

Access on this interface is RW.

AArch32 Registers | AArch64 Registers | AArch32 Instructions | AArch64 Instructions | Index by Encoding | External Registers | External Registers by Offset | Registers by Functional Group | Proprietary Notice

27/03/2019 21:59; e5e4db499bf9867a4b93324c4dbac985d3da9376

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