Perform this step only if you are running the design with video frame buffer at the actual video clock. In this use case, a programmable oscillator supplies the video clock for HDMI TX with a frequency based on the following formula:
TX video clock = (actual pixel rate / pixels in parallel) * color depth ratio
|
Color Depth (Bit per Component) |
Color Depth Ratio |
|---|---|
| 8 | 1.00 |
| 10 | 1.25 |
| 12 | 1.50 |
| 16 | 2.00 |
Note that the design is running at 8 pixels in parallel.
The design example uses the TX video clock with the following resolution, color depth, and video clock frequency configurations. Expand this list according to your application.
Note: Both design variants currently only support 8bpc resolution. To add support for deep color resolution, refer to chapter 3.9.1 Supporting Additional Video Resolutions.
| Resolution |
Color Depth (bit per component) |
Pixel Rate (MHz) |
TX Video Clock (MHz) |
|---|---|---|---|
| 720x480p60 | 8 | 27 | 3.375 |
| 10 | 4.21875 | ||
| 12 | 5.0625 | ||
| 16 | 6.75 | ||
| 1280x720p60 | 8 | 74.25 | 9.28125 |
| 10 | 11.6015625 | ||
| 12 | 13.921875 | ||
| 16 | 18.5625 | ||
| 1920x1080p60 | 8 | 148.5 | 18.5625 |
| 10 | 23.203125 | ||
| 12 | 27.84375 | ||
| 16 | 37.125 | ||
| 3840x2160p60 | 8 | 594 | 74.25 |
| 10 | 92.8125 | ||
| 12 | 111.375 | ||
| 16 | 148.5 | ||
| 7680x4320p60 | 8 | 1188 | 148.5 |
| 10 | 185.625 | ||
| 12 | 222.75 |