Trion T20 BGA256 Query

[RetroHQ]

Trion T20 BGA256 Query

[randyrossi]

29Mhz is my max. I'm using SN65CML's to convert LVDS to CML. I also had to add a load switch to deal with 5V backfeeding from the HDMI connector that can power the FPGA. I'm not using the LVDS serializer. The serialization is driven by a 10x dot clock. I did try but I can't remember the reason the LVDS serializers didn't work for me. I think with ac coupled LVDS, you might be able to get around 16mhz. So you can probably do 640x480. The Tiron chips are definitely not ideal for DVI. I'm amazed it works, really.

[RetroHQ]

Fantastic, thank-you for the response! The PTN3366 takes care of the backfeeding of current and also level shifting on the I2C lines for querying modes, too, it looks like quite a useful (and cheap) part. The LVDS side of the T20 can, apparently, be clocked up to 800Mhz, but I guess ac coupling factor is limiting. :(

[RetroHQ]

Just as a FYI, I've finally built up a test board and I can output 720P via a PTN3366 using 5x serialisation just fine.