D8M resolution&frame rate setting
From Terasic Wiki
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| - | '''How to modify D8M resolution''' | + | '''1. How to modify D8M resolution''' |
Modify camera registers: | Modify camera registers: | ||
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[[File:D8M_register_1.png]] | [[File:D8M_register_1.png]] | ||
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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 | //For example: 640x480 | ||
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[[File:D8M_register_2.png]] | [[File:D8M_register_2.png]] | ||
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| - | '''How to modify D8M frame rate''' | + | '''2. How to modify D8M frame rate''' |
[[File:D8M_frame_rate_1.png]] | [[File:D8M_frame_rate_1.png]] | ||
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In this demo we configure camera SCLK to 150MHz | In this demo we configure camera SCLK to 150MHz | ||
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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. | ||
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[[D8M TopPage|back]] | [[D8M TopPage|back]] | ||
Revision as of 17:49, 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.
