MPAMF_MBWUMON_IDR, MPAM Features Memory Bandwidth Usage Monitoring ID register

The MPAMF_MBWUMON_IDR characteristics are:

Purpose

Indicates the number of memory bandwidth usage monitor instances implemented. This register also indicates several properties of MBWU monitoring, including whether the implementation supports capture, scaling or long counters.

MPAMF_MBWUMON_IDR_s indicates the number of Secure memory bandwidth usage monitor instances. MPAMF_MBWUMON_IDR_ns indicates the number of Non-secure memory bandwidth usage monitor instances.

If MPAMF_IDR.HAS_RIS is 1, fields that mention RIS must reflect the properties of the resource instance currently selected by MPAMCFG_PART_SEL.RIS. Fields that do not mention RIS are constant across all resource instances.

Configuration

The power domain of MPAMF_MBWUMON_IDR 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 MPAMF_MBWUMON_IDR are RES0.

Attributes

MPAMF_MBWUMON_IDR is a 32-bit register.

Field descriptions

The MPAMF_MBWUMON_IDR bit assignments are:

HAS_CAPTURE, bit [31]

The implementation supports copying an MSMON_MBWU to the corresponding MSMON_MBWU_CAPTURE on a capture event.

If RIS is implemented, this field indicates that MBWU monitor capture is implemented for the resource instance selected by MPAMCFG_PART_SEL.RIS.

If MPAMF_MBWUMON_IDR.HAS_LONG is 1, this also indicates that MSMON_MBWU_L_CAPTURE is implemented.

HAS_LONG, bit [30]

When FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p1 is implemented:

Indicates whether MSMON_MBWU_L is implemented.

If HAS_CAPTURE is 1, indicates whether MSMON_MBWU_L_CAPTURE is implemented.

If RIS is implemented, this field indicates that the long MBWU monitor is implemented for the resource instance selected by MPAMCFG_PART_SEL.RIS.

If MPAMF_MBWUMON_IDR.HAS_CAPTURE is 1, this also indicates that MSMON_MBWU_L_CAPTURE is implemented.

Otherwise:

Reserved, RES0.

LWD, bit [29]

When FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p1 is implemented:

Long register VALUE width.

If MPAMF_MBWUMON_IDR.HAS_LONG is 0, MPAMF_MBWUMON_IDR.LWD must also be 0.

If RIS is implemented, this field indicates the length of the MSMON_MBWU_L.VALUE field implemented for the resource instance selected by MPAMCFG_PART_SEL.RIS.

Otherwise:

Reserved, RES0.

HAS_RWBW, bit [28]

When FEAT_MPAMv0p1 is implemented or FEAT_MPAMv1p1 is implemented:

Read/write bandwidth selection is implemented in MSMON_CFG_MBWU_FLT

If RIS is implemented, this field indicates whether read/write bandwidth collection selection is available in MSMON_CFG_MBWU_FLT for resource instance selected by MPAMCFG_PART_SEL.RIS.

Otherwise:

Reserved, RES0.

Bits [27:21]

Reserved, RES0.

SCALE, bits [20:16]

Scaling of MSMON_MBWU.VALUE in bits. If scaling is enabled by MSMON_CFG_MBWU_CTL.SCLEN, the byte count in the VALUE field has been shifted by SCALE bits to the right.

If RIS is implemented, this field indicates the scale value for MSMON_MBWU.VALUE field for the resource instance selected by MPAMCFG_PART_SEL.RIS.

NUM_MON, bits [15:0]

The number of memory bandwidth usage monitor instances implemented. The largest monitor instance selector, MSMON_CFG_MON_SEL.MON_SEL, is NUM_MON minus 1.

If RIS is implemented, this field indicates the number of MBWU monitor instances for MSMON_MBWU.VALUE field for the resource instance selected by MPAMCFG_PART_SEL.RIS.

Accessing the MPAMF_MBWUMON_IDR

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.

MPAMF_MBWUMON_IDR is read-only.

MPAMF_MBWUMON_IDR must be readable from the Non-secure and Secure MPAM feature pages.

MPAMF_MBWUMON_IDR is permitted to have the same contents when read from either the Secure and Non-secure MPAM feature pages unless the register contents is different for Secure and Non-secure versions, when there must be separate registers in the Secure (MPAMF_MBWUMON_IDR_s) and Non-secure (MPAMF_MBWUMON_IDR_ns) MPAM feature pages.

When MPAMF_IDR.HAS_RIS is 1, MPAMF_MBWUMON_IDR shows the configuration of memory bandwidth monitoring for the bandwidth resource instance selected by MPAMCFG_PART_SEL.RIS. Fields that mention RIS in their field descriptions have values that track the implemented properties of the resource instance. Fields that do not mention RIS are constant across all resource instances.

Access to MPAMF_MBWUMON_IDR is not affected by MSMON_CFG_MON_SEL.RIS.

MPAMF_MBWUMON_IDR can be accessed through the memory-mapped interfaces:

Accesses on this interface are RO.

Accesses on this interface are RO.