EclaireXL

12/20/2019

FO 09:56 PM Feature #85: 720p support/1080i support

I guess 1080i is also possible.
Want to note that for 720p60 I need to adjust the frame rate again. Was using 59.94 for the 27MHz option and here its 60.
I wonder if I can get the fractional pll to give an accurate enough 27MHz and 7... foft

FO 09:53 PM Feature #85: 720p support/1080i support

All the methods seem to need a bunch of multipliers, but fortunately we have some on Cyclone V. 25 DSP blocks on A2 and 66 DSP blocks on A4.
Each DSP block can be 3 9x9, 2 18x18 or 1 27x27 multiplier.
Only using a few already so they ... foft

FO 09:52 PM Feature #85: 720p support/1080i support

I wrote some octave scripts to try these out. Plugging mister filters in for one set and for the other set doing area scaling with a bunch of different optimization options. foft

FO 09:50 PM Feature #85: 720p support/1080i support

Great paper on scaling algos foft

FO 09:43 PM Feature #85: 720p support/1080i support

Experimented with filter based scaling. Going with an area based scaler for now instead. foft

FO 09:43 PM Feature #85 (In Progress): 720p support/1080i support

HDMI syncs with 74.25MHz pixel clock. Cyclone V seems surprisingly happy with 742MHz gpio outputs via DDR registers. foft

FO 09:41 PM Feature #85 (In Progress): 720p support/1080i support

Implement 720p60 and 720p50 support, with suitable scaling foft