Apparently, this is helpful for WRS-FL v1.5

- Add execution of script to generate files with repo versions
- Commented out 8p synthesize, uncommeted 18p synthesis
- started playing with conditional sythesis (commented out)

- change signal names to more meaningful
  lj_detected_o / lj_present_o to lj_ext_gm_pll_pres_o / lj_ext_gm_clk_diff_o
  lj_rev_id_i to lj_periph_id_i
- added pull-ups to lj_periph_id_i to make sure its "111" when unused
- made the selection of LJ-related peripheral more generic

The Low-Jitter functionality is now integrated on some versions of the
main board of the WRS. As such, we need to detect the LJ functionality
itself, not a board with it. Renamed from LJD to LJ for clarity.

- updated the pin names to reflect the true functionality
- connect only the pin that is used, this is a HACK and will need to be
  changed in the future.

- dac_sel allows to support AD5683R additonally to AD5662 used so far
- other modificatins, mostly clean-ups
  * change pll_status_i to clk_ext_i
  * removed unused constraints

Update scb_top_sim.vhd. given to the unused input ljd signals, '0' value for the simulator to not complain

Update scb_top_sim.vhd so as to add missing and non-used port signals in order simulator doesn't complain

Hm proposed master

See merge request !1

  1. add pll_status_i clock period constraints
  2. correct the TNM_NET name of rx_rec_clk_bufin.

rather than differential signal for 10M input.

    There are three types of wrs: normal wrs(mark as wrs), wrs with LJD
(mark as WRS-LJD), wrs with embedded lowjitter circuits(mark as WRSLJ).
    lj_loopback_i/o is used to distinguish wrs from WRS-LJD and WRSLJ.
    lj_osc_freq_i is used to distinguish WRSLJ from WRS-LJD.
        lj_osc_freq_i=111 means WRSLJ.
        lj_osc_freq_i=others means WRS-LJD.

    lj_osc_freq_i[2 downto 0] need to be pulled up.