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MPAMCFG_MBW_WINWD, MPAM Memory Bandwidth Partitioning Window Width Configuration Register

The MPAMCFG_MBW_WINWD characteristics are:

Purpose

MPAMCFG_MBW_WINWD is a 32-bit register that shows and sets the value of the window width for the PARTID in MPAMCFG_PART_SEL. MPAMCFG_MBW_WINWD_s reads and controls the bandwidth control window width for the Secure PARTID selected by the Secure instance of MPAMCFG_PART_SEL. MPAMCFG_MBW_WINWD_ns reads and controls the bandwidth control window for the Non-secure PARTID selected by the Non-secure instance of MPAMCFG_PART_SEL.

MPAMCFG_MBW_WINWD is read-only if MPAMF_MBW_IDR.WINDWR == 0, and the window width is set by the hardware, even if variable.

MPAMCFG_MBW_WINWD is read-write if MPAMF_MBW_IDR.WINDWR == 1, permitting configuration of the window width for each PARTID independently on hardware that supports this functionality.

Configuration

The power domain of MPAMCFG_MBW_WINWD is IMPLEMENTATION DEFINED.

This register is present only when MPAMF_IDR.HAS_MBW_PART == 1. Otherwise, direct accesses to MPAMCFG_MBW_WINWD are RES0.

Attributes

MPAMCFG_MBW_WINWD is a 32-bit register.

Field descriptions

The MPAMCFG_MBW_WINWD bit assignments are:

313029282726252423222120191817161514131211109876543210
RES0US_INTUS_FRAC

Bits [31:24]

Reserved, RES0.

US_INT, bits [23:8]

Window width, integer microseconds.

This field reads (and sets) the integer part of the window width in microseconds for the PARTID selected by MPAMCFG_PART_SEL.

US_FRAC, bits [7:0]

Window width, fractional microseconds.

This field reads (and sets) the fractional part of the window width in microseconds for the PARTID selected by MPAMCFG_PART_SEL.

Accessing the MPAMCFG_MBW_WINWD

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.

MPAMCFG_MBW_WINWD_s must be accessible from the Secure MPAM feature page. MPAMCFG_MBW_WINWD_ns must be accessible from the Non-secure MPAM feature page.

MPAMCFG_MBW_WINWD_s and MPAMCFG_MBW_WINWD_ns must be separate registers. The Secure instance (MPAMCFG_MBW_WINWD_s) accesses the window width used for Secure PARTIDs, and the Non-secure instance (MPAMCFG_MBW_WINWD_ns) accesses the window width used for Non-secure PARTIDs.

MPAMCFG_MBW_WINWD can be accessed through the memory-mapped interfaces:

ComponentFrameOffsetInstance
MPAMMPAMF_BASE_s0x0220MPAMCFG_MBW_WINWD_s

This interface is accessible as follows:

  • When MPAMF_MBW_IDR.WINWR == 0 accesses to this register are RO.
  • Otherwise accesses to this register are RW.
ComponentFrameOffsetInstance
MPAMMPAMF_BASE_ns0x0220MPAMCFG_MBW_WINWD_ns

This interface is accessible as follows:

  • When MPAMF_MBW_IDR.WINWR == 0 accesses to this register are RO.
  • Otherwise accesses to this register are RW.


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