ADV7613
Recommended for New Designs
The ADV7613 is a high quality, low power, single-input HDMI
to LVDS display bridge. It incorporates an HDMI capable
receiver that supports up to 1080p...
Datasheet
ADV7613 on Analog.com
Hello,
We are experiencing an intermittent colour issue when a source is connected and happens when the ADV7613 is receiving 1920x1080 60Hz or 1280x720 60Hz. An image is below of the corrupt colours compared to the original video.
In our driver we have set the following recommended register settings based on the guide ez.analog.com/.../ADV7613_5F00_Recommended_5F00_Settings_5F00_Guide.pdf
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x00), 0x02 },
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x01), 0x06 },
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x02), 0xF2 },
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x03), 0x42 },
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x04), 0x63 },
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x05), 0x20 },
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x0C), 0x42 },
{ ADV76XX_REG(ADV76XX_PAGE_IO, 0x15), 0xAE },
{ ADV76XX_REG(ADV76XX_PAGE_CP, 0x8B), 0x40 },
{ ADV76XX_REG(ADV76XX_PAGE_CP, 0x8C), 0x02 },
{ ADV76XX_REG(ADV76XX_PAGE_CP, 0x8D), 0x02 },
{ ADV76XX_REG(ADV76XX_PAGE_CP, 0x6C), 0x00 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x03), 0x98 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x10), 0xA5 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x1B), 0x08 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x45), 0x04 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x97), 0xC0 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x3D), 0x10 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x3E), 0x7B },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x3F), 0x5E },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x4E), 0xFE },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x4F), 0x08 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x57), 0xA3 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x58), 0x07 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x5A), 0x00 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x6F), 0x08 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x83), 0xFE },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x85), 0x10 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x86), 0x9B },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x89), 0x01 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x93), 0x00 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x9B), 0x03 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x9C), 0x80 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x9C), 0xC0 },
{ ADV76XX_REG(ADV76XX_PAGE_HDMI, 0x9C), 0x00 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x40), 0x08 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x43), 0x03 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x44), 0x00 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x45), 0x04 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x46), 0x53 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x47), 0x03 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x4C), 0x71 },
{ ADV76XX_REG(ADV7613_PAGE_LVDS, 0x4E), 0x04 },
The LVDS Transmitter has been configured in the order of the UG-907 manual https://www.analog.com/media/en/technical-documentation/user-guides/adv7613-ug-907.pdf
The decision for the PLL Gear setting in our driver is based on the following rules from the UG-907 manual:
PLL GEAR SELECTION Page 161
The ADV7613 can output graphics resolutions with clock frequency 25MHz to 92 MHz.
For this range of graphics resolutions and frequencies mentioned, the PLL gear must be set as follows:
• From 25 MHz to 40 MHz: TX_PLL_GEAR[2:0] must be set to 000.
• From 40 MHz to 92 MHz: TX_PLL_GEAR[2:0] must be set to 010.
An example of how we calculate the LVDS Clock for 1920x1080 60Hz and 1280x720 60Hz is shown below:
8 lane interface
1920x1080p60 SMPTE 148.50MHz pixel clock; /2 = 74.250HMz LVDS clock; x7 = 519.750Mb/s data rate
1280x720p60 CVT 74.25MHz pixel clock; /2 = 37.125HMz LVDS clock; x7 = 259.875Mb/s data rate
In our hardware platform 57.143MHz is the slowest pixel clock before switching to 4 lane mode, otherwise we use 8 lane mode.
It has been noticed in our testing that sometimes toggling the PLL Gear setting resolves the colour issue.
Some help would be welcome to ensure our configuration is correct, or if this issue is already known.
Thank you
Jonathan
Hi,
When crosschecking your configuration, It seems your 'VID_STD and PRIM_MODE' configuration seems incorrect for "1920x1080 60Hz and 1280x720 60Hz".
Please configure 0x00 and 0x01 register according to below snap for your particular format,
Also configure the below registers according to the recommended configuration and let us know about the result
Thanks,
Poornima
Thank you for your response. We have checked the VID_STD and PRIM_MODE registers, which match your suggestion as we set them later on in the driver. See below:
1920x1080
1280x720
For your second suggestion, we changed the PLL Gear setting (LVDS register 0x44) to a value of 0x02. We also changed LVDS register to 0x11, but this gave us No Signal through our hardware.
However setting LVDS register to 0x51 gave us back a video signal. This equates to 8-bit Colour, DE Active High, VSYNC Active Low and HSYNC Active High.
So in summary the changes made were:
LVDS 0x44: Set to 0x02
LVDS 0x4C Set to 0x51
Result
The colour issue returned within five mode changes between 1920x1080p and 1280x720p.
After making the changes, the colour issue returned as per my initial post on this forum thread.
An image is below of the corrupt colours compared to the original video.
Hi,
Could you please check section "PCB LAYOUT RECOMMENDATIONS" as per UG-907 according to your custom board since configuration seems ok.
Also read and confirm with below LVDS Tx readback registers,
Thanks,
Poornima
