• State TI Thinks Resolved
  • Locked Locked
  • Replies 8 replies
  • Answers 3 answers
  • Subscribers 99 subscribers
  • Views 3191 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

What are the differences between Silicon Revision and CPU Revision?

Hossein Forouzani
Genius 3030 points
Other Parts Discussed in Thread: TMS320C5515

Hi, 

Related to the image attached to this post, I want to know main differences between Silicon Revision  and CPU Revision.
Would you please give some examples to make it clear?

Thanks

  • 0
    TI__Guru**** 161600 points
    Hi,

    I've answered this here:
    e2e.ti.com/.../637620

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    Genius 3030 points

    Hi, 

    The question I've asked here is related to differences between silicon revision and cpu revision. I have gotten the answer of my other question. But this another matter.

    I want you to help me understand these revisions better. In the related application report written by Mugdha Gadkari & Peter Chung, it says:

    "One important thing to note is that the silicon revision and CPU revisions are not same and in no way related."

    I know that the silicon revisions are related to bug fixes and workarounds, butt deep down I really want to know differences. 

    Is there any book or article describing and discussing extensively these things?

  • 0 in reply to Hossein Forouzani
    TI__Guru**** 161600 points
    Hi,

    Is there any book or article describing and discussing extensively these things?


    No, I am not aware of such documents. As far as I know, this is not a public information.

    Best Regards,
    Yordan
  • 0 in reply to Yordan Kovachev
    TI__Mastermind 30170 points

    Hi Hossein,

    You are referring to this app note about CPU revisions and Silicon revisions: http://processors.wiki.ti.com/images/f/f4/C55x_CPU_revision.pdf

    Compare the TMS320C55x DSP CPU Reference Guides for each CPU revision...

    CPU 2.2: http://www.ti.com/lit/ug/spru371f/spru371f.pdf (available from the TMS320C5509A product page)

    CPU 3.3: http://www.ti.com/lit/ug/swpu073e/swpu073e.pdf (available from the TMS320C5515 product page)

    You will find from C55xx CPU Rev 2.2 to CPU Rev 3.3 improvements in...
    * Data-read data bus BB width (16-bits to 32-bits), which allows higher dual-MAC performance (supports 4 independent operands instead of 3)
    * Instruction Buffer Queue length increase from 64 Bytes to 128 Bytes (now supporting 64-bit parallel instructions instead of 48-bit)
    * 3 23-bit address generation units (up from 16-bit)
    * New instructions like LMS, LMSF, Parallel MACs with 4 operands, parallel stores - these allow speedups for 16-bit complex vector multiplies, 32-bit extended precision vector multiplies, 16-bit real vector multiplies, and 16-bit real vector dot products.

    You might also refer to the respective Instruction Set Reference Guides for more details.

    Additionally, the C55x core has many improvements over the C54x core like 2 MAC units instead of 1, 16-bit ALU in addition to 40-bit ALU, 24-bit extended addressing modes over 16-bit, additional instructions, protected instruction pipeline, etc.

    Hope this help,
    Mark

  • 0 in reply to Mark M
    Genius 3030 points
    Hi Mark,


    Thank you for the time you spent answering me. But I was familiar with those differences between CPU revision 2.2 and CPU revision 3.3 which you have mentioned above.
    Related to answer of Yordan, it seems there is no document which describing and discussing extensively SILICON REVISION?
    Perhaps I should change the way I asked this question in order to describe my issue better.

    Is there any fundamental and theoretical book related to these things?
    Is there any scientific definition or standard in electronics about CPU revisions and Silicon revisions?
  • 0 in reply to Hossein Forouzani
    TI__Guru**** 161600 points

    Hi,

    Is there any fundamental and theoretical book related to these things?
    Is there any scientific definition or standard in electronics about CPU revisions and Silicon revisions?


    No, as far as I know, we do not provide such documents. Also I am not aware of such theoretical materials, you should note that this is not fundamental electronics or some kind of standard. This is a matter of integrating different modules/controllers/cpu into a SoC package, and this information is not public and we cannot discuss it.

    Best Regards,
    Yordan

  • 0 in reply to Yordan Kovachev
    Genius 3030 points
    Hi,

    Thank you for your answer.