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MSMON_MBWU, MPAM Memory Bandwidth Usage Monitor Register

The MSMON_MBWU characteristics are:

Purpose

Accesses the monitor instance selected by MSMON_CFG_MON_SEL. MSMON_MBWU_s is the Secure memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL_s. MSMON_MBWU_ns is the Non-secure memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL_ns.

If MPAMF_IDR.HAS_RIS is 1, the monitor instance register accessed is for the resource instance currently selected by MSMON_CFG_MON_SEL.RIS and the monitor instance of that resource instance selected by MSMON_CFG_MON_SEL.MON_SEL.

Configuration

The power domain of MSMON_MBWU is IMPLEMENTATION DEFINED.

This register is present only when MPAMF_IDR.HAS_MSMON == 1 and MPAMF_MSMON_IDR.MSMON_MBWU == 1. Otherwise, direct accesses to MSMON_MBWU are RES0.

Attributes

MSMON_MBWU is a 32-bit register.

Field descriptions

The MSMON_MBWU bit assignments are:

313029282726252423222120191817161514131211109876543210
NRDYVALUE

NRDY, bit [31]

Not Ready. Indicates whether the monitor has possibly inaccurate data.

NRDYMeaning
0b0

The monitor instance is ready and the MSMON_MBWU.VALUE field is accurate.

0b1

The monitor instance is not ready and the contents of the MSMON_MBWU.VALUE field might be inaccurate or otherwise not represent the actual memory bandwidth usage.

VALUE, bits [30:0]

Memory bandwidth usage counter value if MSMON_MBWU.NRDY is 0. Invalid if MSMON_MBWU.NRDY is 1.

VALUE is the scaled count of bytes transferred since the monitor was last reset that meet the criteria set in MSMON_CFG_MBWU_FLT and MSMON_CFG_MBWU_CTL for the monitor instance selected by MSMON_CFG_MON_SEL.

If MSMON_CFG_MBWU_CTL.SCLEN enables scaling, the count in VALUE is the number of bytes shifted right by MPAMF_MBWUMON_IDR.SCALE bit positions and rounded.

Accessing the MSMON_MBWU

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.

MSMON_MBWU_s must be accessible from the Secure MPAM feature page. MSMON_MBWU_ns must be accessible from the Non-secure MPAM feature page.

MSMON_MBWU_s and MSMON_MBWU_ns must be separate registers. The Secure instance (MSMON_MBWU_s) accesses the memory bandwidth usage monitor used for Secure PARTIDs, and the Non-secure instance (MSMON_MBWU_ns) accesses the memory bandwidth usage monitor used for Non-secure PARTIDs.

When RIS is implemented, reads and writes to MSMON_MBWU access the memory bandwidth usage monitor instance for the resource instance selected by MSMON_CFG_MON_SEL.RIS and the memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL.MON_SEL.

When RIS is not implemented, reads and writes to MSMON_MBWU access the memory bandwidth usage monitor instance for the memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL.MON_SEL.

MSMON_MBWU can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_s0x0860MSMON_MBWU_s

Accesses on this interface are RW.

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_ns0x0860MSMON_MBWU_ns

Accesses on this interface are RW.