MSMON_MBWU_CAPTURE, MPAM Memory Bandwidth Usage Monitor Capture Register

The MSMON_MBWU_CAPTURE characteristics are:

Purpose

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.

If MPAMF_IDR.HAS_RIS is 1, the monitor instance capture 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_CAPTURE is IMPLEMENTATION DEFINED.

This register is present only when FEAT_MPAM is implemented, 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:

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.

VALUE, bits [30:0]

Captured memory bandwidth usage counter value if MSMON_MBWU_CAPTURE.NRDY is 0. Invalid if MSMON_MBWU_CAPTURE.NRDY is 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.

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

MSMON_MBWU_CAPTURE can be accessed through the memory-mapped interfaces:

Accesses on this interface are RW.

Accesses on this interface are RW.