controller: fix accumulator overflow

e9cd30b6 · Sebastien Bourdeauducq · ef8c77d4 · e9cd30b6
Commit e9cd30b6 authored Oct 27, 2011 by Sebastien Bourdeauducq
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Showing with 5 additions and 2 deletions

tdc_controller.vhd core/tdc_controller.vhd +5 -2

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--- a/core/tdc_controller.vhd
+++ b/core/tdc_controller.vhd
@@ -12,6 +12,7 @@
 --
 -------------------------------------------------------------------------------
 -- last changes:
+-- 2011-10-27 SB Fix accumulator overflow
 -- 2011-10-27 SB Fix LUT address offset
 -- 2011-08-19 SB Created file
 -------------------------------------------------------------------------------
@@ -286,7 +287,7 @@ begin
        end if;
    end process;
-    process(state, hc_zero, oc_ready_i, last_i)
+    process(state, hc_zero, oc_ready_i, last_i, c_detect_i)
    begin
        ready_p <= '0';
@@ -321,10 +322,12 @@ begin
                his_we_o <= '1';
            when SC_READ =>
                calib_sel_o <= '1';
+                if c_detect_i = '1' then
+                    hc_dec <= '1';
+                end if;
            when SC_UPDATE =>
                calib_sel_o <= '1';
                his_we_o <= '1';
-                hc_dec <= '1';
                if hc_zero = '1' then
                    oc_start_o <= '1';
                end if;