Author: System on Chips

Cortex-A53 Write-Streaming Mode and BUS_ACCESS_LD Anomalies The Cortex-A53 processor, a widely used ARM core in embedded systems, is known for its efficiency and performance in applications ranging from mobile devices to embedded controllers. However, when operating in write-streaming mode, particularly during memory operations such as memset, unexpected behavior in Performance Monitoring Unit (PMU) counters, specifically…

ARM Cortex TLB Invalidation: Broadcast vs. Local Operation Serialization In ARM architectures, the Translation Lookaside Buffer (TLB) is a critical component for virtual-to-physical address translation. The TLB caches recently used translations to reduce latency in memory access. However, maintaining TLB coherency across multiple cores or masters in a system is a complex task, especially when…

ARM Cortex-M4F SMLAxy Instruction Behavior and Sign Bit Handling The ARM Cortex-M4F processor, a member of the Cortex-M family, is widely used in embedded systems for its balance of performance and power efficiency. One of its key features is the support for DSP (Digital Signal Processing) instructions, which include the SMLAxy family of instructions. These…

ARMv8 Core Dump Triggering via Illegal Vector Table Fetch and PSTATE Manipulation The process of triggering a core dump in ARMv8 architectures can be a critical debugging tool, especially when diagnosing complex system failures or unexpected behavior. However, the methods employed to force a core dump, such as manipulating the PSTATE flags or instigating an…

Understanding Worst-Case Execution Time (WCET) Analysis on ARM Cortex-M4F Worst-case execution time (WCET) analysis is a critical aspect of real-time embedded systems design, particularly for safety-critical applications where timing guarantees are paramount. The ARM Cortex-M4F, with its floating-point unit and efficient Thumb-2 instruction set, is widely used in such systems. However, determining the WCET of…

ARM Cortex-M55 Helium Vector Extension and Neon VEXT Instruction Compatibility The ARM Cortex-M55 processor, featuring the Helium vector extension, represents a significant evolution in the ARM architecture for microcontrollers. Helium, also known as M-Profile Vector Extension (MVE), is designed to bring enhanced vector processing capabilities to the Cortex-M series, targeting applications requiring digital signal processing…

Dynamic Coefficient Generation for CMSIS-DSP Band-Pass Filters The core challenge in implementing a parameterized band-pass filter using the ARM CMSIS-DSP library lies in dynamically generating the filter coefficients based on user-defined parameters such as center frequency, Q factor, and sample rate. Unlike static filter designs where coefficients are precomputed using tools like MATLAB’s FDATool, a…

Dynamic Defect Pixel Correction (DPC) Algorithm Parameters and Expected Behavior The Dynamic Defect Pixel Correction (DPC) module in the ARM Mali-IV009 is designed to identify and correct defective pixels in real-time image processing pipelines. Defective pixels, often referred to as "hot pixels" or "stuck pixels," can arise due to sensor imperfections, manufacturing defects, or environmental…

ARM Cortex-R52+ Cache Coherency and Multi-Core Support The ARM Cortex-R52+ is a real-time processor designed for safety-critical applications, offering high performance and deterministic behavior. One of the key points of confusion surrounding the Cortex-R52+ is its support for cache coherency in multi-core configurations. Cache coherency is a critical feature in multi-core systems, ensuring that all…

ARM Cortex-M7 Power Consumption Trends Across 14nm and 10nm Nodes The ARM Cortex-M7 microprocessor is renowned for its high performance and efficiency, making it a popular choice for embedded systems requiring real-time processing capabilities. However, one of the critical factors influencing its adoption in power-sensitive applications is its power consumption, which is heavily dependent on…