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Altera_Forum
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15 years ago

Question about streaming video protocol

Hi all. Well, I know that CVI converts a generic input into an avalon st protocol compatibile data signal. Now, in my sistem i get a 27MHz pixel clock, while my video system is clocked @50MHz, a...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi Phate,

If the colour planes are sent in parallel then your data bus in your ST link becomes 16-bits instead of 8-bits wide, but the Valid, Read, SoP and EoP signals remain one bit wide and they apply to the full 16-bit word. So the Y and Cr/Cb values are transferred simultaneously. It is sill only a single ST link and not two separate ST links. Eveything is still clocked at 50MHz, but the Valid signal will be low more often since you transfer pixels now at about 13.5MHz instead of 27MHz.

Regards,

Niki