typo in documentation

8f70e92c · Nathan Pittet · 441147e0 · 8f70e92c
Commit 8f70e92c authored Mar 04, 2023 by Nathan Pittet
Hide whitespace changes
Inline Side-by-side

Showing with 3 additions and 4 deletions

gc_cordic_top.vhd modules/dsp/gc_cordic_top.vhd +3 -4

No files found.
--- a/modules/dsp/gc_cordic_top.vhd
+++ b/modules/dsp/gc_cordic_top.vhd
@@ -27,7 +27,7 @@
 --
 -- rotate / circular
 -- inputs limitations : 
--   - sqrt(x*x + y*y) < K*FS
+--   - sqrt(x*x + y*y) < FS/K
 --   - -FS < z < +FS
 -- outputs :
 --   - x_o = K*FS*(x*cos(z)-y*sin(z)) (-FS <= x_o <= +FS)
@@ -37,10 +37,10 @@
 -- vector / circular
 -- inputs limitations
 --   - avoid small x and y values because the error grows quite large
--   - sqrt(x*x + y*y) < K*FS
+--   - sqrt(x*x + y*y) < FS/K
 --   - -FS < z < +FS
 -- outputs
--   - x_o = K*sqrt(x*x-y*y) (0 <= x_o <= +FS)
+--   - x_o = K*sqrt(x*x+y*y) (0 <= x_o <= +FS)
 --   - y_o = 0
 --   - z_o = z + atan(y/x) (-FS <= z_o <= +FS)
 --
@@ -159,7 +159,6 @@ architecture rtl of gc_cordic_top is
  
  function f_shift(inp : signed; i : integer) return signed is
    variable v_ret : signed(inp'range);
-    variable v_all_ones : std_logic := '1';
  begin
    if i >= inp'left then
      v_ret := (others => '0');