Hello, does the 947 support the second clock for LVDS (usually pinned between D6+ and D7-) ? And if not, will displays with dual LVDS channels continue to work?
Hi,
We're trying to resolve an image on a 1920x1080p display using dual OLDI. Without SerDes, the second image is achieved, but with an input into the 947 and output from 948, we're getting 4 images rather than one as seen in the fist image.
Hi Josh,
We're using default settings on both eval boards. So far, we've tested 2 different displays which work over a direct connection to the video source, but have the same problem where 4 repeat images appear after connecting SerDes. I've attached images of the current settings of the eval boards.
The 947 switch was placed incorrectly. However, after fixing it, the same issue is still appearing. With the 948 patgen, the initial External clock setting results in a similar problem as before, where 4 images appear on the screen. Changing this to an internal, 1080p 60Hz setting produces the expected image. The same issue appears on the 947 patgen, where the initial settings seem to be causing the same 4 image problem, which is then fixed by going to an internal clock.
The below settings created a correct display.
The below settings created a problematic display
Hi Bruce,
As it was mentioned before, I believe that this is not a SerDes related problem, seems more like a timing issue or a panel issue. You are sending different resolution, timing, and PCLK between normal and abnormal. Note that it shows the abnormal video signal if you are not sending the appropriate timing. Could you share the desired timing?
Best,
Josh
Hi Josh,
We are trying to use this screen, I have attached the datasheet as well. One thing that is interesting is that the image appears fine without connecting through SerDes, directly from source to display directly over LVDS.
