ltc2174: add comments

add217ba · Tristan Gingold · 565c3c07 · add217ba
Commit add217ba authored Jul 02, 2021 by Tristan Gingold
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ltc2174_2l16b_receiver.vhd hdl/platform/xilinx/spartan6/ltc2174_2l16b_receiver.vhd +4 -4

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--- a/hdl/platform/xilinx/spartan6/ltc2174_2l16b_receiver.vhd
+++ b/hdl/platform/xilinx/spartan6/ltc2174_2l16b_receiver.vhd
@@ -252,9 +252,9 @@ begin  -- architecture arch
        I_INVERT      => FALSE,
        USE_DOUBLER   => TRUE)
      port map (
-        I            => adc_dco,
-        IOCLK        => clk_serdes_p,
-        DIVCLK       => l_clk_div,
+        I            => adc_dco,        -- 350Mhz DDR
+        IOCLK        => clk_serdes_p,   -- 350Mhz
+        DIVCLK       => l_clk_div,      -- 100Mhz (2*350/7)
        SERDESSTROBE => serdes_strobe);

    cmp_dco_bufio_n : BUFIO2
@@ -265,7 +265,7 @@ begin  -- architecture arch
        USE_DOUBLER   => FALSE)
      port map (
        I            => adc_dco,
-        IOCLK        => clk_serdes_n,
+        IOCLK        => clk_serdes_n,   --  350Mhz, 180 phase shift.
        DIVCLK       => open,
        SERDESSTROBE => open);