abc80.v: restructure the video_width conditional to synthesizeabc80-de1-9

Restructure the video_width conditional, so the synthesizer can
recognize it as the usual kind of flipflop with reset and nothing
unusual.

1 files changed, 8 insertions, 6 deletions

diff --git a/abc80.v b/abc80.v
index c4c1048..3f3ed06 100644
--- a/abc80.v
+++ b/abc80.v
@@ -670,12 +670,14 @@ module abc80 (
 	if ( ~rst_n )
 	  video_width <= ~sw[9]; // Set SW9 to go to 40 column after reset
 	else
-	  if ( ~abc_in_n[3] )
-	    video_width <= 1'b0;
-	  else if ( ~abc_in_n[4] )
-	    video_width <= 1'b1;
-	  else if ( key1_strobe & key1_debounced )
-	    video_width <= ~video_width;
+	  begin
+	     if ( ~abc_in_n[3] )
+	       video_width <= 1'b0;
+	     else if ( ~abc_in_n[4] )
+	       video_width <= 1'b1;
+	     else if ( key1_strobe & key1_debounced )
+	       video_width <= ~video_width;
+	  end
      end
 
    // Sound generator