Added no-opt constraints for Xilix Vivado

Addresses issue vecs/fiji#39

bin/FIJI/Constraints.pm

@@ -142,17 +142,36 @@ sub _vivado_pblocks {
 # ------------------------------------------------------------------------------
 END_HDR
     my $fin = "# EOF";
+    my $no_opt = <<"END_NO_OPT";
+# Turn off cross-boundary optimizations
+
+# do not even look at the original netlist
+set_property dont_touch TRUE [get_cells -quiet [list $DUT_NAME]]
+
+# do not optimize accross FIJI boundaries
+set_property keep_hierarchy TRUE [get_cells -quiet [list $FIJI_NAME]]
+
+END_NO_OPT
+
     my $area = <<"END_AREA";
+
+# Create physical constraints for FIJI and DUI
+
 create_pblock pblock_$DUT_NAME
 create_pblock pblock_$FIJI_PBLOCK
 add_cells_to_pblock [get_pblocks pblock_$DUT_NAME] [get_cells -quiet [list $DUT_NAME]]
 add_cells_to_pblock [get_pblocks pblock_$FIJI_PBLOCK] [get_cells -quiet [list $FIJI_NAME]]
-# resize_pblock [get_pblocks pblock_$DUT_NAME] -add {<LO>:<HI>}
-# resize_pblock [get_pblocks pblock_$FIJI_PBLOCK] -add {<LO>:<HI>}
-END_AREA
 
+# Set size and location of the PBlocks. This default size will likely fail.
+# You will likely need to resize them in the GUI.
+resize_pblock [get_pblocks pblock_$DUT_NAME] -add {SLICE_X1Y1:SLICE_X10Y10}
+resize_pblock [get_pblocks pblock_$FIJI_PBLOCK] -add {SLICE_X11Y1:SLICE_X15Y3}
+END_AREA
     if ($cfg->{'mode'} eq "FIX_PLACEMENT") {
+        $txt .= $no_opt;
         $txt .=  $area;
+    } elsif ($cfg->{'mode'} eq "OPT_OFF") {
+        $txt .= $no_opt;
     } elsif ($cfg->{'mode'} ne "ALLOW" && $cfg->{'mode'} ne "OPT_OFF") {
         $logger->error("Unknown SYNTHESIS_MODE " . $cfg->{'mode'});
         return undef;