Commits on Apr 5, 2019

1. This modification makes several interworking changes to leverage the … …

   …7-series dedicated constant sources:
   
   - Change yosys to use new VCC and GND black boxes for the $true and
     $false nets.
   - Implement synthetic tiles BLK_SY-VCC and BLK_SY-GND that connect to a
     global VCC and GND constant network respectively.
   - Connect TIEOFF HARD0 and HARD1 pins to the new global constant
     networks.
   - Add additional CARRY0 techmap to handle constant CYINIT signals.
   
   Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>

   

   litghost committed Apr 5, 2019
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2. This commit adds proper track support to points.decompose_points_into… …

   …_tracks
   
   Multiple changes are required to add this support:
    - Temporary bounds on min x_low and y_low are removed.
    - Added basic test to channel2.Channel and fix bug due to unstable
      track ordering.
    - Add track model support to points.decompose_points_into_tracks,
      in particular adding support for tracks that connect a N-1 if
      available.
    - Adds more robust channel verification logic in prjxray_create_edges.
    - Add "right-only" mode to points.decompose_points_into_tracks.
      This is useful for arches where all pins are statically determined
      on the right of the tile, rather than choosen.
   
   Signed-off-by: Keith Rothman <537074+litghost@users.noreply.github.com>

   

   litghost committed Apr 5, 2019
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