• Barriers in in-order cores like cortex-A53, A7

    Hi experts!

    As you know, power efficient arm like cortexA7, A53 has in-order pipleline.
    However as far as I understanding, Barriers like dmb, dsb, isb are related with out-of-order memory access.
    But barriers are even used in in-order cpus.
    What is for?
    Can…

  • MOESI state encoding of Cortex-A7

    Hi,

    I am looking at Cortex-A7 TRM, In "Direct Access to Internal Memory"

    we can see several information regarding a cache line. Those are:

    1. Current data in cache

    2. its 4-bit MOESI state,

    3. Outer Memory Attribute

    4. its tag

    5. NS State.

    However…

  • Cortex-A7 pipeline is non-symmetric, what does this attribute mean?

    Cortex-A7 pipeline is non-symmetric, what does this attribute mean?

    My understand is that cortex-A7 pipeline's five entries does not have the same two, in the contrary, the cortex-A15 have the two entries are the same.

    ca7pipeline.PNGca15pipeline.PNG

  • Which is better of thees CPUs

    Which is better of thees CPUs:

    Cortex A53 octa core 1.5 ghz,

    Cortex A7 Allwinner T8 Eight core 2.0 ghz,

    Cortex A9 Quad-Core 1.8 ghz ?

  • what are the main differences between cortex A7, A9, A53

    What are the main/important features added/updated?

    Thank you.

  • Is there any available data about the PPA comparison b/w Cortex-A7 and Cortex-A53

    Performance (DMIPS/CoreMark/SpecInt, etc.), Power and Area comparison on an apple-to-apple basis? Thanks a lot!

  • A Walk Through the Cortex-A Mobile Roadmap

    Chinese Version中文版

    Introduction

    The ARM Cortex-A mobile application processor product line spans several generations and three main product tiers. Developers and SoC designers experienced with one or more of the newer ARM ARM Processors benefit from an…

  • High efficiency, midrange or high performance Cortex-A - What is the difference?

    A question that I am asked many times is – what is the fundamental difference between the high efficiency, mid range and the high performance application processors in the ARM Cortex family?

    The simple answer to this is – the power budget…

  • AMBA 4 ACE and Hardware Cache Coherency - Top 5 Questions

    I thought I'd post a short blog post about commonly asked questions on AMBA 4 ACE and system coherency.

    What does ACE mean?

    ACE is the "AXI Coherency Extensions" introduced with the AMBA 4 specification released in 2011. For those of you thinking "What…

  • big.LITTLE and AMBA 4 ACE keep your cache warm and avoid flushes

    Updated 29th October 2013


    High performance and power efficiency are critical to the latest mobile devices, and AMBA® 4 ACE™ is a fundamental technology supporting ARM's big.LITTLE processing. In case you missed the announcements, the big…

  • Top things you might not know about ARM processors

    ARM has started what I find an interesting series of presentations giving facts about their products.

    Here is the list so far: