[gennum] AVIIA - Video Format

 

Video Formats – 1

Aviia products are based on SDI (Serial Digital Interface)
YCrCb 4:2:2 is the most efficient transportation structure for uncompressed video streams.

Each pixel has two components Y/C, each component is 10-bit depth.

The clock and timing are embedded in the serial data stream, one wire and long-distance transmission.

Only support 2.97(2.97/1.001)G, 1.485(1.485/1.001)G and 270M bps serial rates. In parallel domain,

supports 148.5 (148.5/1.001), 74.25 (74.25/1.001), 27 and 13.5 MHz PCLK only.  

 

Video Formats – 2

 

 

Video Raster:
HTotal : total pixels per line;               HActive : active pixels per line;
VTotal : total lines per frame (or field); VActive : active lines per frame (or field);

Two total raster sizes and frame/field rate determines the stream rate:
   PCLK         = HTotal x VTotal x Frame Rate
   Serial Rate = PCLK x Bits/pixel
Add two active raster sizes together determine the video format.

Video Formats – 3

Examples:
1) 1080P60, YCrCb 4:2:2
  PCLK = 2200 (total pixel/line) x 1125 (total line/frame) x 60 (frame/s) = 148.5M pixel/s
  Serial rate = 148.5M pixel/s x 20 bit/pixel = 2.97 Gbit/s

2) 1080P30, YCrCb 4:2:2
  PCLK = 2200 (total pixel/line) x 1125 (total line/frame) x 30 (frame/s) = 74.25M pixel/s
  Serial rate = 74.25M pixel/s x 20 bit/pixel = 1.485 Gbit/s

3) 1080i59.94, YCrCb 4:2:2
  PCLK = 2200 (total pixel/line) x 540 (total line/field) x 60/1.001 (field/s) = 74.175M pixel/s
  Serial rate = 74.175M pixel/s x 20 bit/pixel = 1.4835 Gbit/s

4)  1080i59.94, RGB(A) 4:4:4(:4)
  PCLK = 2200 (total pixel/line) x 540 (total line/field) x 60/1.001 (field/s) = 74.175M pixel/s
  Serial rate = 74.175M pixel/s x 40 bit/pixel = 2.967 Gbit/s