D8M resolution&frame rate setting
From Terasic Wiki
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In the demo, we use camera '''auto size''' figure to easily modify the camera resolution: just modify 0x3808~0x380B four registers. | In the demo, we use camera '''auto size''' figure to easily modify the camera resolution: just modify 0x3808~0x380B four registers. | ||
| - | + | For example: 640x480 | |
[[File:D8M_register_2.png]] | [[File:D8M_register_2.png]] | ||
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HTS: Horizontal total size | HTS: Horizontal total size | ||
| - | + | VTS: Vertical total size | |
fps = 150M / HTS/VTS | fps = 150M / HTS/VTS | ||
Take setting 640x480@60fps as example: | Take setting 640x480@60fps as example: | ||
| - | + | 60 fps (combined with pll settings) | |
[[File:D8M_frame_rate_2.png]] | [[File:D8M_frame_rate_2.png]] | ||
| - | fps = 150,000,000/0x1200/0x021E | + | fps = 150,000,000/0x1200/0x021E |
= 150,000,000/4608/542 | = 150,000,000/4608/542 | ||
≈ 60 | ≈ 60 | ||
Note： Horizontal blanking = HTS - Horizontal output width | Note： Horizontal blanking = HTS - Horizontal output width | ||
| + | |||
As the camera mipi lvds data is processed by MIPI parallel Bridge IC, it will be limited by mipi parallel internal Linebuffer length, then, customer can try to set HTS value as larger as possible ( on condition that VTS value is still meet your requirement) to make a longer H blanking to reduce peak bandwidth requirements. | As the camera mipi lvds data is processed by MIPI parallel Bridge IC, it will be limited by mipi parallel internal Linebuffer length, then, customer can try to set HTS value as larger as possible ( on condition that VTS value is still meet your requirement) to make a longer H blanking to reduce peak bandwidth requirements. | ||
Revision as of 17:52, 18 April 2017
1. How to modify D8M resolution
Modify camera registers:
In the demo, we use camera auto size figure to easily modify the camera resolution: just modify 0x3808~0x380B four registers.
For example: 640x480
2. How to modify D8M frame rate
In this demo we configure camera SCLK to 150MHz
HTS: Horizontal total size VTS: Vertical total size
fps = 150M / HTS/VTS
Take setting 640x480@60fps as example:
60 fps (combined with pll settings)
fps = 150,000,000/0x1200/0x021E
= 150,000,000/4608/542
≈ 60
Note： Horizontal blanking = HTS - Horizontal output width
As the camera mipi lvds data is processed by MIPI parallel Bridge IC, it will be limited by mipi parallel internal Linebuffer length, then, customer can try to set HTS value as larger as possible ( on condition that VTS value is still meet your requirement) to make a longer H blanking to reduce peak bandwidth requirements.
