Other Parts Discussed in Thread: TMDS181
Hello,
I'm currently working with the "TMDS181 6-Gbps TMDS retimer in the RGZ package evaluation module", for some HDMI 1.4 and 2.0 eye scans on my own evaluation bord.
For that, I've removed the jumpers from J6 and J4 and I’ve directly connected the "SCL_CTL_USB PAGE8" and "SDA_CTL_USB PAGE8" lines to the I2C bus from my on-board "SN65DP159RGZR" chip.
In this way I'm trying to see how the HDMI signal integrity gets affected by the lengths of the PCB routes. The eye scans on lower data rates are looking fine, but I'm having serious issues on higher resolutions, or anything that sticks with HDMI 2.0 speeds, for example at 3840x2160_60_P.
I've saw that the software has a bug the invalidates the results and I was wondering if you find any solution for it. I don't think that manually redrawing the eye scans is quite a real solution, besides that my results are way off comparing to those that are present into the Users' Guide (page 11 from TMDS181RGZ Evaluation Module). I am quite sure that this is coming from that bug, because all the eye scans have ambiguous flat zones.
Things that I have already tried without any success:
Considering that I'm not doing any measurements trough an HDMI cable, I've reduced the data lanes equalization to minimum.
I've tried a different refresh rate.
Bellow you can see some screen-shots with my entire setup from Eye Scan Tool.
