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MSMON_MBWU_CAPTURE, MPAM Memory Bandwidth Usage Monitor Capture Register

The MSMON_MBWU_CAPTURE characteristics are:

Purpose

MSMON_MBWU_CAPTURE is a 32-bit read-write register that accesses the captured MSMON_MBWU monitor instance selected by MSMON_CFG_MON_SEL. MSMON_MBWU_CAPTURE_s is the Secure memory bandwidth usage monitor capture instance selected by the Secure instance of MSMON_CFG_MON_SEL. MSMON_MBWU_CAPTURE_ns is the Non-secure memory bandwidth usage monitor capture instance selected by the Non-secure instance of MSMON_CFG_MON_SEL.

Configuration

The power domain of MSMON_MBWU_CAPTURE is IMPLEMENTATION DEFINED.

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

Attributes

MSMON_MBWU_CAPTURE is a 32-bit register.

Field descriptions

The MSMON_MBWU_CAPTURE bit assignments are:

313029282726252423222120191817161514131211109876543210
NRDYVALUE

NRDY, bit [31]

Not Ready. The captured NRDY bit from the corresponding instance of MSMON_MBWU. This bit indicates whether the captured monitor value has possibly inaccurate data.

NRDYMeaning
0b0

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

0b1

The captured monitor was ready and the VALUE fields is accurate.

VALUE, bits [30:0]

Captured memory bandwidth usage counter value if NRDY == 0. Invalid if NRDY == 1.

VALUE is the captured VALUE field from the corresponding instance of MSMON_MBWU, the 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.

VALUE captures the MSMON_MBWU.VALUE and preserves any scaling that had been performed on the VALUE field in that register.

Accessing the MSMON_MBWU_CAPTURE

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_CAPTURE_s must be accessible from the Secure MPAM feature page. MSMON_MBWU_CAPTURE_ns must be accessible from the Non-secure MPAM feature page.

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

MSMON_MBWU_CAPTURE can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_s0x0868MSMON_MBWU_CAPTURE_s

Accesses on this interface are RW.

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_ns0x0868MSMON_MBWU_CAPTURE_ns

Accesses on this interface are RW.



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