DS90UH948-Q1: question about DS90UH948-Q1

Hi Jimmy,

Jimmy Huang said:

Please provide a register instruction manual for UH949/UB949/UH948/UH948

1. For register assignments, you may refer to the device's functional modes in the datasheets for determining which registers to set based on the desired application of the devices. If there are any questions about specific functionalities and their register configuration, please feel free to ask about them here.

DS90UB949-Q1 1080p HDMI to FPD-Link III Bridge Serializer datasheet (Rev. B) (ti.com)

DS90UH948-Q1 Automotive 2K FPD-Link III to OpenLDI Deserializer With HDCP datasheet (Rev. D)

Jimmy Huang said:

Can UB949 and UH948 be paired for configuration?

2. The UB949 and the UH948 are compatible for configuration, as long as the UH948 is not HDCP-enabled during configuration.

Jimmy Huang said:

As a pure hardware screen manufacturer, does the customer still need to test this HDCP function?

3. HDCP content protection for FPD-Link exists between the SER and the DES, there is no HDCP protocol between the deserializer device and the display it interfaces to. It may be useful to test HDCP functionality for devices like the UH949 to ensure end-to-end video is achieved from source to display, since the purpose of the customer choosing UH948 is to include HDCP.

Best,

Miguel

Hi Miguel：

Regarding the third question, after understanding the post and HDCP function, the following conclusion has been drawn. Please help confirm:

1. HDCP is a software functional solution that relies on the chip UH948/UH949 to have this capability. This dependency is provided by the chip itself and is not related to the screen hardware design, so there is no need for hardware manufacturers to do additional testing work;

2. HDCP testing requires specialized testing software and authorized agency ATC. The register configuration method provided by TI chip UH948/949 is only one part of it, and there are other processes and software besides configuration. This TI is not provided or clear, and ATC needs to provide it;

In summary, we do not need to conduct HDCP function testing. Firstly, it requires cost. Secondly, even if you can do it with the same effort as ATC, it does not necessarily mean that the HDCP function is necessarily OK, which means it is not recognized.

Hi Jimmy,

Jimmy Huang said:

HDCP is a software functional solution that relies on the chip UH948/UH949 to have this capability. This dependency is provided by the chip itself and is not related to the screen hardware design, so there is no need for hardware manufacturers to do additional testing work;

This is correct. When the HDCP content protection reaches the deserializer, the output data from the deserializer to the display is decrypted. Therefore, no hardware accommodations are needed on the display design for HDCP.

Jimmy Huang said:

HDCP testing requires specialized testing software and authorized agency ATC. The register configuration method provided by TI chip UH948/949 is only one part of it, and there are other processes and software besides configuration. This TI is not provided or clear, and ATC needs to provide it;

This is also true, the UH devices may enable or disable HDCP functionality, so it is only part of the number of configurations available. You may test end-to-end video without using HDCP.

I hope that provides some confirmation and clarity!

Best,

Miguel