SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
In video mode, there are a lot of sizes defined for the video stream generation. This data corresponds to the payload of the various generated packets and not to their duration. However, they are closely linked. It is the responsibility of the system integrator and the application to use correct sizes to ensure the correct video timing and behaviour, because the system may use 1 to 4 active data lanes with a fixed number of bytes for the header/checksum overhead. In the same way, when programming D-PHY time (to switch from LP to HS), the application must consider D-PHY time plus overhead due to LLP and LML crossing time (see Section 12.6.4.7.7.2, Video stream settings (VSG)).
VSG Control
Start and stop sequences can take a long time to be performed. If the requests are not maintained up to the time the status bit are indicating effective start or stop, they can be ignored and the VSG may not have started or stopped as expected by application. It is then up to the application to carefully manage the request and to verify that requests are being processed before changing the state of the VSG.
Test Generator:
The DSITX provides test generator to provide a video data stream. When using TVG, all sources can be used (provided VCA permits it) however the SDI interface must not be programmed to send video data and must be restricted to command mode.
The pixel modes supported are: RGB 16-, 18-, 24-, 30- and 36-bit; YCbCr422 16-bit; and YCbCr420 12-bit (note that additional YCbCr422 20-bit and YCbCr420 24-bit may be supported using SDI interface, but are restricted to command mode only).
The supported display sizes are listed below: