Allow support of generic platforms

lpdc for virtex6 (wrs)

See merge request !19

This reverts commit 2349460e.

This reverts commit 2349460e.

WIP: Pieter fasec wrpc v5

See merge request !14

platform/xilinx/xwrc_platform_vivado.vhd: Generate direct DMTD clock using a BUFR

See merge request !15

modules/wrc_core/wrc_periph.vhd: Add reset signal to sensitivity list

See merge request !16

platform/xilinx/vivado: Fix generates of clock signals that originate from phys

See merge request !17

Remove default assignments of clock signals when g_use_default_plls = FALSE
that actually originate from the phys / transceivers and are thus independant
of said generic (signals would have multiple writers / assignements).

Signed-off-by: Frederik Pfautsch <frederik.pfautsch@missinglinkelectronics.com>

Signed-off-by: Frederik Pfautsch <frederik.pfautsch@missinglinkelectronics.com>

Instead of generating the 62.5MHz DMTD clock using a process, divide an incoming
125MHz clock by 2 using a BUFR on 7Series FPGA (similarly to the Ultrascale+
path).

Signed-off-by: Frederik Pfautsch <frederik.pfautsch@missinglinkelectronics.com>

Most files changes due to change from LM32 to URV

fasec ip - fix constraints but comment clk_gtx_tx create_generated_clock cause of critical warning ..no logical path from master clock..

Not obvious and if not done, file type is 'unknown' and not available
later on for the loader. See Xilinx support article 71226.