ADV7282AM no image

Hi,

 Please note that, Until proper termination is achieved then you will not be able to decode Video data from the MIPI CSI-2 signals output by the ADV7280-M.

 As part of MIPI specification, the MIPI receiver needs to terminate the signals correctly. The termination required changes depending on the MIPI mode (e.g. high speed, low power mode etc). The receiver needs to detect the mode of operation and dynamically set its termination accordingly. Note that the Clock signals will only appear correctly when properly terminated.

 When we try to terminate the output signals from the ADV7280-M (Microprocessor / FPGA) then you will see the correct MIPI traces.

 Note that the Microprocessor / FPGA needs to be able to detect the output format (high speed mode or low power mode) and dynamically change its input impedance. If the Micro processor/ FPGA does not control the termination correctly then the MIPI signals from the ADV7280-M cannot be decoded.

 Please ensure your MIPI receiver (Microprocessor/ FPGA) has been configured correctly.

This is described in applications note AN-1337

http://www.analog.com/media/en/technical-documentation/application-notes/AN-1337.pdf

For our evaluation of the ADV7280-M we used the MIPI reference termination board which is available from here:

MIPI Test Boards | Interoperability Laboratory

ADI linux drivers can be found at Linux Drivers [Analog Devices Wiki]

ADI do support Linux drivers - they are located here (https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/media/i2c) The ADV728x related content is stored in the ADV7180.c file.

Also the Linux driver for the ADV7280 branch in the Linux kernel git repository on the ADI github account.

https://github.com/analogdevicesinc/linux/tree/adv7280

Also please ensure with XTAL clock as per recommended script configuration and compare your schematic with reference at ADV7282 and ADV7282-M Design Support Files - Documents - Video - EngineerZone (analog.com)

Refer this thread Schematic Review ADV7282M - Q&A - Video - EngineerZone (analog.com) Here expert given some suggestion about the schematic stand point.

Please note that, If the MIPI CSI-2 receiver is initialized after the transmitter device is initialized, the MIPI CSI-2 may never detect the LP to HS mode transition on the clock lane from the transmitter device. If the MIPI CSI-2 receiver does not detect the LP to HS mode transition, it may never start video capture.

Thanks,

Poornima

Hi,

 Please note that, Until proper termination is achieved then you will not be able to decode Video data from the MIPI CSI-2 signals output by the ADV7280-M.

 As part of MIPI specification, the MIPI receiver needs to terminate the signals correctly. The termination required changes depending on the MIPI mode (e.g. high speed, low power mode etc). The receiver needs to detect the mode of operation and dynamically set its termination accordingly. Note that the Clock signals will only appear correctly when properly terminated.

 When we try to terminate the output signals from the ADV7280-M (Microprocessor / FPGA) then you will see the correct MIPI traces.

 Note that the Microprocessor / FPGA needs to be able to detect the output format (high speed mode or low power mode) and dynamically change its input impedance. If the Micro processor/ FPGA does not control the termination correctly then the MIPI signals from the ADV7280-M cannot be decoded.

 Please ensure your MIPI receiver (Microprocessor/ FPGA) has been configured correctly.

This is described in applications note AN-1337

http://www.analog.com/media/en/technical-documentation/application-notes/AN-1337.pdf

For our evaluation of the ADV7280-M we used the MIPI reference termination board which is available from here:

MIPI Test Boards | Interoperability Laboratory

ADI linux drivers can be found at Linux Drivers [Analog Devices Wiki]

ADI do support Linux drivers - they are located here (https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/media/i2c) The ADV728x related content is stored in the ADV7180.c file.

Also the Linux driver for the ADV7280 branch in the Linux kernel git repository on the ADI github account.

https://github.com/analogdevicesinc/linux/tree/adv7280

Also please ensure with XTAL clock as per recommended script configuration and compare your schematic with reference at ADV7282 and ADV7282-M Design Support Files - Documents - Video - EngineerZone (analog.com)

Refer this thread Schematic Review ADV7282M - Q&A - Video - EngineerZone (analog.com) Here expert given some suggestion about the schematic stand point.

Please note that, If the MIPI CSI-2 receiver is initialized after the transmitter device is initialized, the MIPI CSI-2 may never detect the LP to HS mode transition on the clock lane from the transmitter device. If the MIPI CSI-2 receiver does not detect the LP to HS mode transition, it may never start video capture.

Thanks,

Poornima

Thank you! I will double check all the points you've mentioned.