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MPAMF_PRI_IDR, MPAM Priority Partitioning Identification Register

The MPAMF_PRI_IDR characteristics are:

Purpose

Indicates which MPAM priority partitioning features are present on this MSC. MPAMF_PRI_IDR_s indicates priority partitioning features accessed from the Secure MPAM feature page. MPAMF_PRI_IDR_ns indicates priority partitioning features accessed from the Non-secure MPAM feature page.

When MPAMF_IDR.HAS_RIS is 1, some fields in this register give information for the resource instance selected by MPAMCFG_PART_SEL.RIS. The description of every field that is affected by MPAMCFG_PART_SEL.RIS has that information within the field description.

Configuration

The power domain of MPAMF_PRI_IDR is IMPLEMENTATION DEFINED.

This register is present only when FEAT_MPAM is implemented and MPAMF_IDR.HAS_PRI_PART == 1. Otherwise, direct accesses to MPAMF_PRI_IDR are RES0.

Attributes

MPAMF_PRI_IDR is a 32-bit register.

Field descriptions

The MPAMF_PRI_IDR bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0DSPRI_WDRES0DSPRI_0_IS_LOWHAS_DSPRIRES0INTPRI_WDRES0INTPRI_0_IS_LOWHAS_INTPRI

Bits [31:26]

Reserved, RES0.

DSPRI_WD, bits [25:20]

Number of implemented bits in the downstream priority field (DSPRI) of MPAMCFG_PRI.

If HAS_DSPRI == 1, this field must contain a value from 1 to 16, inclusive.

If HAS_DSPRI == 0, this field must be 0.

If RIS is implemented, this field indicates the number of downstream priority bits for the resource instance selected by MPAMCFG_PART_SEL.RIS.

Bits [19:18]

Reserved, RES0.

DSPRI_0_IS_LOW, bit [17]

Indicates whether 0 in MPAMCFG_PRI.DSPRI is the lowest or the highest downstream priority.

DSPRI_0_IS_LOWMeaning
0b0

In the MPAMCFG_PRI.DSPRI field, a value of 0 means the highest priority.

0b1

In the MPAMCFG_PRI.DSPRI field, a value of 0 means the lowest priority.

If RIS is implemented, this field indicates that 0 is the lowest downstream priority for the resource instance selected by MPAMCFG_PART_SEL.RIS.

HAS_DSPRI, bit [16]

Indicates that the MPAMCFG_PRI register implements the DSPRI field.

HAS_DSPRIMeaning
0b0

This MSC supports priority partitioning, but does not implement a downstream priority (DSPRI) field in the MPAMCFG_PRI register.

0b1

This MSC supports downstream priority partitioning and implements the downstream priority (DSPRI) field in the MPAMCFG_PRI register.

If RIS is implemented, this field indicates that downstream priority is implemented for the resource instance selected by MPAMCFG_PART_SEL.RIS.

Bits [15:10]

Reserved, RES0.

INTPRI_WD, bits [9:4]

Number of implemented bits in the internal priority field (INTPRI) in the MPAMCFG_PRI register.

If HAS_INTPRI == 1, this field must contain a value from 1 to 16, inclusive.

If HAS_INTPRI == 0, this field must be 0.

If RIS is implemented, this field indicates the number of internal priority bits for the resource instance selected by MPAMCFG_PART_SEL.RIS.

Bits [3:2]

Reserved, RES0.

INTPRI_0_IS_LOW, bit [1]

Indicates whether 0 in MPAMCFG_PRI.INTPRI is the lowest or the highest internal priority.

INTPRI_0_IS_LOWMeaning
0b0

In the MPAMCFG_PRI.INTPRI field, a value of 0 means the highest priority.

0b1

In the MPAMCFG_PRI.INTPRI field, a value of 0 means the lowest priority.

If RIS is implemented, this field indicates that 0 is the lowest internal priority for the resource instance selected by MPAMCFG_PART_SEL.RIS.

HAS_INTPRI, bit [0]

Indicates that this MSC implements the INTPRI field in the MPAMCFG_PRI register.

HAS_INTPRIMeaning
0b0

This MSC supports priority partitioning, but does not implement the internal priority (INTPRI) field in the MPAMCFG_PRI register.

0b1

This MSC supports internal priority partitioning and implements the internal priority (INTPRI) field in the MPAMCFG_PRI register.

If RIS is implemented, this field indicates that internal priority is implemented for the resource instance selected by MPAMCFG_PART_SEL.RIS.

Accessing the MPAMF_PRI_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_PRI_IDR is read-only.

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

MPAMF_PRI_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_PRI_IDR_s) and Non-secure (MPAMF_PRI_IDR_ns) MPAM feature pages.

When MPAMF_IDR.HAS_RIS is 1, MPAMF_PRI_IDR shows the configuration of priority partitioning for the 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.

MPAMF_PRI_IDR can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_s0x0048MPAMF_PRI_IDR_s

Accesses on this interface are RO.

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_ns0x0048MPAMF_PRI_IDR_ns

Accesses on this interface are RO.