hdl/*/*_adc_common/fmc_adc_pkg.vhd: add ref clk function

As the ref_clk equal to "c_num_adc_channels" means "external reference clock" we use a function to generate the correct reference clock in all cases

hdl//_adc_common/fmc_adc_pkg.vhd: add ref clk function
As the ref_clk equal to "c_num_adc_channels" means "external reference clock" we use a function to generate the correct reference clock in all cases
a9fe4a52 · Lucas Russo · 27ca18de · a9fe4a52
Commit a9fe4a52 authored May 06, 2014 by Lucas Russo
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fmc_adc_pkg.vhd hdl/modules/fmc_adc_common/fmc_adc_pkg.vhd +14 -0

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--- a/hdl/modules/fmc_adc_common/fmc_adc_pkg.vhd
+++ b/hdl/modules/fmc_adc_common/fmc_adc_pkg.vhd
@@ -265,6 +265,8 @@ package fmc_adc_pkg is

  function f_std_logic_to_bool(input : std_logic) return boolean;

+  function f_adc_ref_clk(ref_clk : t_ref_adc_clk) return natural;
+
  -----------------------------
  -- Components declaration
  ----------------------------
@@ -743,6 +745,18 @@ package body fmc_adc_pkg is
    end if;
  end f_std_logic_to_bool;

+  function f_adc_ref_clk(ref_clk : t_ref_adc_clk)
+    return natural
+  is
+    constant c_ref_clk_any : natural := 1; -- Any clock from 0 to c_num_adc_channels-1
+  begin
+    if (ref_clk = c_num_adc_channels) then -- External reference clock
+      return c_ref_clk_any;
+    else
+      return ref_clk;
+    end if;
+  end f_adc_ref_clk;
+
  ---- revise function and make it generic? Does it worth it?
  --function f_mmcm_params(clk_in : real)
  --  return t_mmcm_param