Add a BUFG on the adc serdes PLL feedback path, add termination on LVDS data line from ADC.

git-svn-id: http://svn.ohwr.org/fmc-adc-100m14b4cha/trunk@82 ddd67a1a-c8ad-4635-afe9-0b8a11d8f8e4

Add a BUFG on the adc serdes PLL feedback path, add termination on LVDS data line from ADC.
git-svn-id: http://svn.ohwr.org/fmc-adc-100m14b4cha/trunk@82 ddd67a1a-c8ad-4635-afe9-0b8a11d8f8e4
f513a2b9 · mcattin · 1fb0e23d · f513a2b9 · f513a2b9
Commit f513a2b9 authored Nov 16, 2011 by mcattin
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Showing with 9 additions and 2 deletions

fmc_adc_100Ms_core.vhd hdl/adc/rtl/fmc_adc_100Ms_core.vhd +8 -1

adc_serdes.vhd hdl/spec/ip_cores/adc_serdes.vhd +1 -1

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--- a/hdl/adc/rtl/fmc_adc_100Ms_core.vhd
+++ b/hdl/adc/rtl/fmc_adc_100Ms_core.vhd
@@ -266,6 +266,7 @@ architecture rtl of fmc_adc_100Ms_core is
  -- Clocks and PLL
  signal dco_clk    : std_logic;
  signal clk_fb     : std_logic;
+  signal clk_fb_buf : std_logic;
  signal locked_in  : std_logic;
  signal locked_out : std_logic;
  signal serdes_clk : std_logic;
@@ -473,7 +474,7 @@ begin
      REF_JITTER         => 0.010)
    port map (
      -- Output clocks
-      CLKFBOUT => clk_fb,
+      CLKFBOUT => clk_fb_buf,
      CLKOUT0  => serdes_clk,
      CLKOUT1  => fs_clk_buf,
      CLKOUT2  => open,
@@ -493,6 +494,12 @@ begin
      I => fs_clk_buf
      );

+  cmp_fb_clk_buf : BUFG
+    port map (
+      O => clk_fb,
+      I => clk_fb_buf
+      );
+
  ------------------------------------------------------------------------------
  -- ADC data and frame SerDes
  ------------------------------------------------------------------------------

--- a/hdl/spec/ip_cores/adc_serdes.vhd
+++ b/hdl/spec/ip_cores/adc_serdes.vhd
@@ -137,7 +137,7 @@ begin
    -- Instantiate a buffer for every bit of the data bus
     ibufds_inst : IBUFDS
       generic map (
-         DIFF_TERM  => FALSE,             -- Differential termination
+         DIFF_TERM  => TRUE,             -- Differential termination
         IOSTANDARD => "LVDS_25")
       port map (
         I          => DATA_IN_FROM_PINS_P  (pin_count),