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Altera_Forum's avatar
Altera_Forum
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15 years ago

SDI questions

in the sdi megecore what frenquency we supply to the gxb4_cal_clk in 3g mode 148.5? in hd mode 74.25 ?

i see the arria model the project supply 100mhz to the gxb4_cal_clk

the user guide does not descrip it clearly so i need help

thank you very much

very hope for you apply

;)

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    I have the same problem with the SDI megafunction when using the normal SD and HD modes. When choosing to triple standard the sample works with 148,5MHz, but it does not work with the other SDI megafunctions. Which frequency (gxb4_cal_clk) should I used for the megafunction?

    Best regards
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    do it work? i find i can not lock video as you

    if you find some useful informations pls tell me

    thanks

    bless my poor english
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Hello

    I use a 27MHz oscillator it is free running and is not locked to the video clock.

    BR,