The MSMON_MBWU characteristics are:
Accesses the monitor instance selected by MSMON_CFG_MON_SEL. MSMON_MBWU_s is the Secure memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL_s. MSMON_MBWU_ns is the Non-secure memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL_ns.
If MPAMF_IDR.HAS_RIS is 1, the monitor instance 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.
The power domain of MSMON_MBWU 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 MSMON_MBWU are RES0.
MSMON_MBWU is a 32-bit register.
The MSMON_MBWU bit assignments are:
31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
NRDY | VALUE |
Not Ready. Indicates whether the monitor has possibly inaccurate data.
NRDY | Meaning |
---|---|
0b0 |
The monitor instance is ready and the MSMON_MBWU.VALUE field is accurate. |
0b1 |
The monitor instance is not ready and the contents of the MSMON_MBWU.VALUE field might be inaccurate or otherwise not represent the actual memory bandwidth usage. |
Memory bandwidth usage counter value if MSMON_MBWU.NRDY is 0. Invalid if MSMON_MBWU.NRDY is 1.
VALUE is the scaled 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.
If MSMON_CFG_MBWU_CTL.SCLEN enables scaling, the count in VALUE is the number of bytes shifted right by MPAMF_MBWUMON_IDR.SCALE bit positions and rounded.
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_s must be accessible from the Secure MPAM feature page. MSMON_MBWU_ns must be accessible from the Non-secure MPAM feature page.
MSMON_MBWU_s and MSMON_MBWU_ns must be separate registers. The Secure instance (MSMON_MBWU_s) accesses the memory bandwidth usage monitor used for Secure PARTIDs, and the Non-secure instance (MSMON_MBWU_ns) accesses the memory bandwidth usage monitor used for Non-secure PARTIDs.
When RIS is implemented, reads and writes to MSMON_MBWU access the memory bandwidth usage monitor instance for the resource instance selected by MSMON_CFG_MON_SEL.RIS and the memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL.MON_SEL.
When RIS is not implemented, reads and writes to MSMON_MBWU access the memory bandwidth usage monitor instance for the memory bandwidth usage monitor instance selected by MSMON_CFG_MON_SEL.MON_SEL.
Component | Frame | Offset | Instance |
---|---|---|---|
MPAM | MPAMF_BASE_s | 0x0860 | MSMON_MBWU_s |
Accesses on this interface are RW.
Component | Frame | Offset | Instance |
---|---|---|---|
MPAM | MPAMF_BASE_ns | 0x0860 | MSMON_MBWU_ns |
Accesses on this interface are RW.
01/07/2020 15:57; 80324f0b9997bede489cc15ad1565345720bcd2a
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