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:
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:
Component | Frame | Offset | Instance |
---|---|---|---|
MPAM | MPAMF_BASE_s | 0x0220 | MPAMCFG_MBW_WINWD_s |
This interface is accessible as follows:
- When MPAMF_MBW_IDR.WINDWR == 0 accesses to this register are RO.
- Otherwise accesses to this register are RW.
Component | Frame | Offset | Instance |
---|---|---|---|
MPAM | MPAMF_BASE_ns | 0x0220 | MPAMCFG_MBW_WINWD_ns |
This interface is accessible as follows:
- When MPAMF_MBW_IDR.WINDWR == 0 accesses to this register are RO.
- Otherwise accesses to this register are RW.