Nexys Video

[Masahiko]

Hi, All

When I preparing two NEXYS VIDEO boards and connecting between the respective boards

by DISPLAY PORT cable, is the serial data communication in 3.125Gbps unrelated to the standard of DISPLAY PORT possible?

※ This is a question of the purpose to which a circuit diagram in Display Port part isn't exhibited.
Thank you.

Masahiko Onoda
PALTEK Corporation. Japan.

[hamster]

Hi!

I've worked with the DisplayPort output on the Nexys Video. .

The Nexys Video only has a mini DisplayPort Output so can't be used to receive data.  It really is configured only for sending data at 2.70Gb/s (20x the reference clock of 135 MHz) 

The page 47 of the transceiver user guide (https://www.xilinx.com/support/documentation/user_guides/ug476_7Series_Transceivers.pdf) indicates that:

   PLLfreq = Refclock * N1 * N2 / M,

...and that the PLL frequency must be between 1.6 and 3.3 GHz.

The line rate is:

   LineRate = PLLFreq 2 * / D.

With N1 = 5, N2 = 5, M=2 the PLL Freq will be 1687.5 MHz, and with a D of 1, the data rate will be 3375, which is just out of spec, but might just work

Hey! Wow! I've just seen how you can run the DisplayPort interface at 1.62 Gb/s, reference clock of 135, with N1 of 3, N2 of 4 gives a PLL frequency of 1620 GHz, so with a D value of 2, you get 1.62Gb/s.... sweet!