GTP change connections: Cannot set LOC property

Question

I have a PHY-CHIP with XAUI Interface connected to a A7-FPGA-CHIP(GTP). My schematics say I should reconfigure the "polarity and order" of my incoming and outgoing xaui - GTP Pins.

Here an example:

• phy-xtx0_3N is wired to mgt216RX0P
• but I think it should be to mgt216RX3N

I tried to change my xdc file and I tried to connect the signals in my top lvl.

I get one critical warning like this:

[Vivado 12-1411] Cannot set LOC property of ports, Cannot set PACKAGE_PIN property of ports,  port a7_mgt216_rx_p_i[0] can not be placed on PACKAGE_PIN B11 because the PACKAGE_PIN is occupied by port a7_mgt216_rx_n_i[3] ["ts.xdc":25]

But I get like 8 critical warnings of this :

[Vivado 12-1411] Cannot set LOC property of ports, Cannot set PACKAGE_PIN property of ports,  port a7_mgt216_rx_n_i[0] can not be placed on PACKAGE_PIN A11 because the PACKAGE_PIN is occupied by port a7_mgt216_rx_n_i[3] ["/home/constraints.xdc":26]

Questions:

What do you think:

Is it possible to change it or is it bad luck if its not wired correctly on the pcb? Is there another XAUI example I could try? I don't think so right? Its rather a very special topic right? In best case I could fix the bad connection between GTP and XAUI right?

what may not work:

xaui< -> transceiver<-> **change order of signals** <-> phy

possible solution:

xaui <-> **change order of signals** <-> transceiver<-> phy

lol i thought is easy but xaui is connected really strange to the transceiver. I thought it would just connect "directly" but there is something in between so I maybe cant change it that easy.

here you can see the entering connections from the phy to the gtp.

Tx0 and Rx2 go to GTP Channel 1 and from there to the XAUI I am really not sure if this will work xD I counted them n/p swapped pairs: 3

can I change this connection from GTP to XAUI Core easily?

What do you think about TX/RX POLARITY it should switch some TX n/p and RX n/P of Channels. Only problem would be mixed up lanes from XAUI to GTP^^

I need to check the Transceiver connections. How is a transceiver normally connected to incoming / outgoing data...

Update:

change the *xci file now:

https://support.xilinx.com/s/article/57546?language=en_US

mgt_txdata_reord(216+15 downto 216) <= mgt_txdata(15 downto 0);

mgt_txdata_reord(316+15 downto 316) <= mgt_txdata(31 downto 16);

mgt_txdata_reord(116+15 downto 116) <= mgt_txdata(47 downto 32);

mgt_txdata_reord(016+15 downto 016) <= mgt_txdata(63 downto 48);

mgt_txcharisk_reord(22+1 downto 22) <= mgt_txcharisk(1 downto 0);

mgt_txcharisk_reord(32+1 downto 32) <= mgt_txcharisk(3 downto 2);

mgt_txcharisk_reord(12+1 downto 12) <= mgt_txcharisk(5 downto 4);

mgt_txcharisk_reord(02+1 downto 02) <= mgt_txcharisk(7 downto 6);

What do you think about it?

..

(I need also to change the polarity now of some lanes, with the config vector of the transceiver ..

maybe thats all

haha)

Answer 1

Tranceivers are generally on dedicated pins so you cannot just remap them like that.

You might, maybe, be able to do your second option, but may need a register between the lut and the transceiver to meet timing if you need an inversion.