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MSMON_MBWU_L, MPAM Long Memory Bandwidth Usage Monitor Register

The MSMON_MBWU_L characteristics are:

Purpose

Accesses the monitor instance selected by MSMON_CFG_MON_SEL. MSMON_MBWU_L_s is the Secure memory bandwidth usage monitor instance selected by the Secure instance of MSMON_CFG_MON_SEL. MSMON_MBWU_L_ns is the Non-secure memory bandwidth usage monitor instance selected by the Non-secure instance of MSMON_CFG_MON_SEL.

If MPAMF_IDR.HAS_RIS is 1, the monitor instance long monitor 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_L 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_LONG == 1. Otherwise, direct accesses to MSMON_MBWU_L are RES0.

Attributes

MSMON_MBWU_L is a 64-bit register.

Field descriptions

The MSMON_MBWU_L bit assignments are:

When MPAMF_MBWUMON_IDR.LWD == 0:
6362616059585756555453525150494847464544434241403938373635343332
NRDYRES0VALUE
VALUE

NRDY, bit [63]

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

NRDYMeaning
0b0

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

0b1

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

Bits [62:44]

Reserved, RES0.

VALUE, bits [43:0]

Long (44-bit) memory bandwidth usage counter value if MSMON_MBWU_L.NRDY is 0. Invalid if MSMON_MBWU_L.NRDY is 1.

VALUE is the long 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.

When MPAMF_MBWUMON_IDR.LWD == 1:
6362616059585756555453525150494847464544434241403938373635343332
NRDYVALUE
VALUE
313029282726252423222120191817161514131211109876543210
313029282726252423222120191817161514131211109876543210

NRDY, bit [63]

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

NRDYMeaning
0b0

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

0b1

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

VALUE, bits [62:0]

Long (63-bit) memory bandwidth usage counter value if MSMON_MBWU_L.NRDY is 0. Invalid if MSMON_MBWU_L.NRDY is 1.

VALUE is the long count of bytes transferred since the monitor instance 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.

Accessing the MSMON_MBWU_L

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_L_s must be accessible from the Secure MPAM feature page. MSMON_MBWU_L_ns must be accessible from the Non-secure MPAM feature page.

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

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

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

MSMON_MBWU_L can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_s0x0880MSMON_MBWU_s

Accesses on this interface are RW.

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_ns0x0880MSMON_MBWU_ns

Accesses on this interface are RW.