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MSMON_MBWU, MPAM Memory Bandwidth Usage Monitor Register

The MSMON_MBWU characteristics are:

Purpose

MSMON_MBWU is a 32-bit read-write register that 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.

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

0b1

The monitor is ready and the VALUE fields is accurate.

VALUE, bits [30:0]

Memory bandwidth usage counter value if NRDY == 0. Invalid if NRDY == 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 == 1, the count in VALUE is the number of bytes shifted right by MPAMF_MBWUMON_IDR.SCALE bit positions and rounded. See section 10.2.1.

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.

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.



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