Fix ring oscillator setup

core/tdc.vhd

@@ -49,7 +49,7 @@ entity tdc is
         -- Number of coarse counter bits.
         g_COARSE_COUNT   : positive := 25;
         -- Length of each ring oscillator.
-        g_RO_LENGTH      : positive := 20;
+        g_RO_LENGTH      : positive := 31;
         -- Frequency counter width.
         g_FCOUNTER_WIDTH : positive := 13;
         -- Frequency counter timer width.

demo/boards/spec/rotest/rotest.vhd

@@ -66,7 +66,7 @@ begin
         );
     cmp_ringosc: tdc_ringosc
         generic map(
-            g_LENGTH => 401
+            g_LENGTH => 31
         )
         port map(
             en_i  => en,

demo/boards/spec/rtl/system.v

@@ -462,7 +462,7 @@ tdc_hostif #(
 	.g_RAW_COUNT(9),
 	.g_FP_COUNT(13),
 	.g_COARSE_COUNT(25),
-	.g_RO_LENGTH(20),
+	.g_RO_LENGTH(31),
 	.g_FCOUNTER_WIDTH(13),
 	.g_FTIMER_WIDTH(10)
 ) tdc (

hostif/tdc_hostif.vhd

@@ -45,7 +45,7 @@ entity tdc_hostif is
         g_RAW_COUNT      : positive := 9;
         g_FP_COUNT       : positive := 13;
         g_COARSE_COUNT   : positive := 25;
-        g_RO_LENGTH      : positive := 20;
+        g_RO_LENGTH      : positive := 31;
         g_FCOUNTER_WIDTH : positive := 13;
         g_FTIMER_WIDTH   : positive := 10
     );