[hdl] [bugfix] Properly sign-extend timestamp values in timestamp adder/subtractor

6cdecdba · Dimitris Lampridis · 7b243fd4 · 6cdecdba
Commit 6cdecdba authored Sep 26, 2019 by Dimitris Lampridis
Hide whitespace changes
Inline Side-by-side

Showing with 6 additions and 7 deletions

tdc_ts_addsub.vhd hdl/rtl/tdc_ts_addsub.vhd +6 -7

No files found.
--- a/hdl/rtl/tdc_ts_addsub.vhd
+++ b/hdl/rtl/tdc_ts_addsub.vhd
@@ -99,14 +99,13 @@ begin  -- rtl
      elsif(enable_i = '1') then
        pipe(0) <= valid_i;

-        sums(0).tai <= signed( resize(unsigned(a_i.tai) + unsigned(b_i.tai), 33) );
-        sums(0).seq <= a_i.seq;
+        sums(0).seq   <= a_i.seq;
        sums(0).slope <= a_i.slope;
-        sums(0).meta <= a_i.meta;
-        
-        sums(0).frac   <= signed( resize(unsigned(a_i.frac),16) + resize(unsigned(b_i.frac), 16) );
-        sums(0).coarse <= signed(resize(unsigned(a_i.coarse), sums(0).coarse'length) +
-                          resize(unsigned(b_i.coarse), sums(0).coarse'length));
+        sums(0).meta  <= a_i.meta;
+
+        sums(0).tai    <= resize(signed(a_i.tai), 33) + resize(signed(b_i.tai), 33);
+        sums(0).frac   <= resize(signed(a_i.frac), 16) + resize(signed(b_i.frac), 16);
+        sums(0).coarse <= signed(a_i.coarse) + signed(b_i.coarse);

      else
        pipe(0) <= '0';