ecppll: declare internal feedback wire explicitly in highres mode

libtrellis/tools/ecppll.cpp

diff --git a/libtrellis/tools/ecppll.cpp b/libtrellis/tools/ecppll.cpp
index b2c1131..3e3ad15 100644
--- a/libtrellis/tools/ecppll.cpp
+++ b/libtrellis/tools/ecppll.cpp
@@ -390,7 +390,7 @@
 
   file << "    output locked\n";
   file << ");\n";
-  if(params.internal_feedback)
+  if(params.internal_feedback || params.mode == pll_mode::HIGHRES)
     file << "wire clkfb;\n";
   if(params.dynamic)
   {