channel: disable ring oscillator on reset

2ee3da6c · Sebastien Bourdeauducq · ff408591 · 2ee3da6c
Commit 2ee3da6c authored Oct 25, 2011 by Sebastien Bourdeauducq
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tdc_channel.vhd core/tdc_channel.vhd +4 -1

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--- a/core/tdc_channel.vhd
+++ b/core/tdc_channel.vhd
@@ -12,6 +12,7 @@
 --
 -------------------------------------------------------------------------------
 -- last changes:
+-- 2011-10-25 SB Disable ring oscillator on reset
 -- 2011-08-03 SB Created file
 -------------------------------------------------------------------------------

@@ -98,6 +99,7 @@ signal raw          : std_logic_vector(g_RAW_COUNT-1 downto 0);
 signal raw_d1       : std_logic_vector(g_RAW_COUNT-1 downto 0);
 signal raw_d2       : std_logic_vector(g_RAW_COUNT-1 downto 0);
 signal lut          : std_logic_vector(g_FP_COUNT-1 downto 0);
+signal ro_en        : std_logic;
 begin
    -- register calibration select signal to avoid glitches
    process(clk_i)
@@ -166,9 +168,10 @@ begin
            g_LENGTH => g_RO_LENGTH
        )
        port map(
-            en_i  => ro_en_i,
+            en_i  => ro_en,
            clk_o => ro_clk_o
        );
+    ro_en <= ro_en_i and not reset_i;

    detect_d1 <= polarity_d1 xor polarity_d2;