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Visitor stratix2
Visitor
175 Views
Registered: ‎12-21-2018

hdmi_tx_ss. generating video sync signals at 4px/clock native video

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I am using Native Video Input Interface with hdmi_tx_ss at 4 pixel per clock, and I am generating the video sync signals:

VIDEO_IN_active_video
VIDEO_IN_data
VIDEO_IN_hsync
VIDEO_IN_vsync

for 1080p60 timing is:
Front Porch = 88px
Sync Width = 44px
Back Porch = 148px

since input is 4 pixel per clock video_clk is pixel clok divided by 4
to generate video sinc signals with my video_clk I just divide this values by 4, and it works
Front Porch = 88px / 4 = 22
Sync Width = 44px / 4 = 11
Back Porch = 148px / 4 = 37

but for 720p60
Front Porch 110px / 4 = 27.5
Sync Width 40px / 4 = 10
Back Porch 220px / 4 = 55

counter cannot count 27.5 clocks
Any idea how this problem can be resolved?

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Visitor stratix2
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58 Views
Registered: ‎12-21-2018

Re: hdmi_tx_ss. generating video sync signals at 4px/clock native video

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moving to 2px/clk

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5 Replies
Moderator
Moderator
125 Views
Registered: ‎11-09-2015

Re: hdmi_tx_ss. generating video sync signals at 4px/clock native video

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HI @stratix2 

I assume you are using the Xilinx VIdeo timing controller? If yes, this is not supported. The resolution (all parameters) need to be dividable by the PPC.

Regards


Florent
Product Application Engineer - Xilinx Technical Support EMEA
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Visitor stratix2
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119 Views
Registered: ‎12-21-2018

Re: hdmi_tx_ss. generating video sync signals at 4px/clock native video

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@florentw 

no, I am not using Xilinx VIdeo timing controller, I use my code,

but, even if I generate sync signals on double video clock, I guess it won't resolve the problem since the input is clocked on video clock.

so, no solution for 4px/clk 720p60?

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Moderator
Moderator
110 Views
Registered: ‎11-09-2015

Re: hdmi_tx_ss. generating video sync signals at 4px/clock native video

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Hi @stratix2

It might work if you find a timing which is dividable. 

Maybe you can move the sync slightly 


Florent
Product Application Engineer - Xilinx Technical Support EMEA
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Moderator
Moderator
76 Views
Registered: ‎11-21-2018

Re: hdmi_tx_ss. generating video sync signals at 4px/clock native video

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Hi @stratix2 

 

If your question is answered or your issue is solved, please kindly mark the response which helped as solution (click on "Accept as solution" button below the reply)

 

If this is not solved/answered, please reply in the topic giving more information on your current status.

 

Thanks and Regards,

Aoife
Product Application Engineer - Xilinx Technical Support EMEA
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Visitor stratix2
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59 Views
Registered: ‎12-21-2018

Re: hdmi_tx_ss. generating video sync signals at 4px/clock native video

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moving to 2px/clk

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