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Question about TAS5766M Coefficient data.

Satoshi
Guru 19495 points

I read TAS766M Coefficient data 3 times.

It was different (change) in a data of following Page-Address.

------------------------------------------------------------

Page44                   read 1    read 2    read 3

　Address：20ｈ　　　　　４Ａ　　　５Ａ　　　２１

　Address：21ｈ　　　　　２０　　　８０　　　Ｃ０

Page45

　Address：08ｈ　　　　　ＣＣ　　　Ｃ２　　　ＣＣ

　Address：09ｈ　　　　　Ｅ０　　　００　　　Ｅ０

Page52

　Address：1Cｈ　　　　　００　　　０２　　　０１

　Address：1Dｈ　　　　　９６　　　８Ｆ　　　５Ａ

　Address：1Eｈ　　　　　７９　　　Ｃ５　　　６３

Page70

　Address：60ｈ　　　　　４Ａ　　　５Ａ　　　２１

　Address：61ｈ　　　　　２０　　　８０　　　Ｃ０

※There were no changes for other coefficient data.

------------------------------------------------------------

Please let me know about two point below.

・What are the contents of these Page-Addess?

　I think that page 44(20h/21h) and page 45(08h/09h) are the Biquad filters.

　but, i didn't find information of page 52(1Ch/1Dh/1Eh) and page 70(60h/61h).

・As stated above, these coefficient data were change, is it no problem?

 

Best regards,

Satoshi

  • 0
    TI__Mastermind 46195 points

    Hi Satoshi-san,

    Some of the C-RAM locations are written by the miniDSP algorithm itself. Changes to the C-RAM locations below are expected from dump to dump:

    C6   Page 0x2C, Register 0x20
    C7   Page 0x2C, Register 0x24
    C30  Page 0x2D, Register 0x08
    C31  Page 0x2D, Register 0x0C
    C32  Page 0x2D, Register 0x10
    C37  Page 0x2D, Register 0x24
    C38  Page 0x2D, Register 0x28
    C39  Page 0x2D, Register 0x2C
    C53  Page 0x2D, Register 0x64
    C54  Page 0x2D, Register 0x68
    C59  Page 0x2D, Register 0x7C
    C93  Page 0x2F, Register 0x14
    C245 Page 0x34, Register 0x1C

    Regards,

    Jorge

  • 0 in reply to J-
    Guru 19495 points
    Dear Jorge-san

    Thank you for reply.

    Is Change in Page-70(0x46) also OK?

    Best regards,
    Satoshi
  • 0 in reply to Satoshi
    TI__Mastermind 46195 points

    Hi Satoshi,

    Yes. That would be C245 in Buffer B. See updated list below.

    C6   Page 0x2C/0x3E, Register 0x20
    C7   Page 0x2C/0x3E, Register 0x24
    C30  Page 0x2D/0x3F, Register 0x08
    C31  Page 0x2D/0x3F, Register 0x0C
    C32  Page 0x2D/0x3F, Register 0x10
    C37  Page 0x2D/0x3F, Register 0x24
    C38  Page 0x2D/0x3F, Register 0x28
    C39  Page 0x2D/0x3F, Register 0x2C
    C53  Page 0x2D/0x3F, Register 0x64
    C54  Page 0x2D/0x3F, Register 0x68
    C59  Page 0x2D/0x3F, Register 0x7C
    C93  Page 0x2F/0x41, Register 0x14
    C245 Page 0x34/0x46, Register 0x1C

    Regards,

    Jorge

  • 0 in reply to J-
    TI__Mastermind 46195 points
    Note that Page 70, Register 0x60 is Reserved and not part of C-RAM. The last coefficient is C255 which is on Pages 0x2C/0x46, Registers 0x44-0x47.