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ac6 >> ac6-formation >> Processeurs ARM >> ARM Cores >> Cortex-R5 implementation Télécharger le catalogue Télécharger la page Ecrivez nous Version imprimable

RR1 Cortex-R5 implementation

This course covers the Cortex-R5 / Cortex-R5F ARM cores

formateur
Objectives
  • This course is split into 3 important parts:
    • Cortex-R5 architecture
    • Cortex-R5 software implementation and debug
    • Cortex-R5 hardware implementation.
  • Interaction between level 1 caches, TCM and main memory is studied through sequences.
  • The course explains how to assign access permissions and attributes to regions by using the MPU.
  • The exception mechanism is detailed, indicating how the VIC port can contribute to reduce interrupt latency.
  • Sequences involving memory, cache and external maste are used to explain the benefits of the ACP port.
  • The course also details the hardware implementation and provides some guidelines to design a SoC based on Cortex-R5.
  • An overview of the Coresight specification is provided prior to describing the debug related units.
Labs are run under RVDS
A more detailed course description is available on request at formation@ac6-formation.com
Prerequisites and related courses
  • Basic knowledge of the ARM architecture.
  • Assembly-level programming notions
Course material
  • Printed training material is given to attendees during training.
  • Precise and easy to use, it can be used as a reference afterwards.

First day
ARM BASICS
  • States and modes
  • Benefit of register banking
  • Exception mechanism
  • Instruction sets
INTRODUCTION TO CORTEX-R5
  • Slave and master AXI ports
  • Highlighting the new features with regard to Cortex-R4
  • ARMv7-R architecture
  • Exceptions
  • System control coprocessor
  • Configurable options
  • Redundant CPU vs Twin-CPU
INSTRUCTION PIPELINE
  • Prefetch unit
  • Instruction cycle timing and interlock behavior
  • Dynamic branch prediction mechanism: global history buffer
  • Data Processing Unit
  • Limited dual-issuing
  • Global History Buffer
  • Return stack
EXCLUSIVE RESOURCE MANAGEMENT
  • Explaining issues when several processors share an exclusive resource
  • Software aspects, load / store exclusive instructions
  • Integrated local monitor
  • Hardware aspects
  • Using events to avoid to consume power while waiting for resource release
MEMORY TYPES
  • Device and normal memory ordering
  • Memory type access restrictions
  • Access order
  • Memory barriers
MEMORY PROTECTION UNIT
  • ARM v7 PMSA
  • Default memory map
  • Cortex-R5 MPU and bus faults
  • Region overview
  • Setting up the MPU
EXCEPTION MANAGEMENT
  • Low Interrupt Latency
  • Primecell VIC PL192
  • VIC basic signal timing
  • Connectivity: daisy-chained VIC
  • Interrupt priority and masking
  • Determining the cause of the fault through CP15 status registers
  • Precise vs imprecise faults
Second day
LEVEL 1 MEMORY SYSTEM
  • Cache basics
  • Tag RAM and Data RAM organization
  • Handling cache parity / ECC errors
  • Cache maintenance operations
  • Tightly Coupled Memories
  • ECC/parity protection
  • Preloading TCMs with ECC
  • Using TCMs from reset
  • Store buffer, merging data
CACHE COHERENCY
  • Hardware coherency vs software coherency
  • ACP pass through interface,
  • Virtual AXI peripheral interface region
  • DMA into TCM
  • Highlighting the difference between the µSCU and the Cortex-A SCU
AXI PROTOCOL
  • PL301 AXI interconnect
  • AXI channels, channel handshake
  • Transaction ordering
  • Read and write burst timing diagrams
  • AXI master interface attributes
  • Write merging example
  • AXI slave interfaces attributes
  • Peripheral interfaces port attributes
  • Accelerator Coherency Port interface
  • Controlling an external cache
HARDWARE IMPLEMENTATION
  • Clock domains
  • Reset domains
  • Power control
  • Maintaining caches and TCM powered while turning off the pipeline: dormant mode
  • Power mode interaction with ACP
  • Debugging the processor while powered down
Third day
APB - ADVANCED PERIPHERAL BUS
  • Second-level address decoding
  • Pinout
  • APB3.0 new features
PERFORMANCE MONITOR
  • Event counting
  • Related interrupts
  • Debugging a multi-core system with the assistance of the PMU
LOW POWER MODES
  • Voltage domains
  • Run mode, standby mode, dormant mode
  • Communication to the power management controller
CORESIGHT DEBUG UNITS
  • Benefits of CoreSight
  • Invasive debug, non-invasive debug
  • APBv3 debug interface
  • Connection to the Debug Access Port
  • Process related breakpoint and watchpoint
  • Debug Communication Channel
  • ETM interface
  • Cross-Trigger Interface
  • Debugging systems with energy management capabilities
THUMB-2 INSTRUCTION SET (V7-A)
  • Introduction
  • General points on syntax
  • Data processing instructions
  • Branch and control flow instructions
  • Memory access instructions
  • If…then conditional blocks
  • Stack in operation
  • Exclusive load and store instructions
  • Memory barriers and synchronization
  • Interworking ARM and Thumb states