small bugfixes that resolve signal instabilities where needed

[hwmod.git] / src / pc_communication.vhd

diff --git a/src/pc_communication.vhd b/src/pc_communication.vhd
index 53ca2150cf5b2dc3492504455ee9b0a2f8914ad3..3251284a4ca13c926e7bbed69d2220e0d00ccb3c 100644 (file)
--- a/src/pc_communication.vhd
+++ b/src/pc_communication.vhd
@@ -36,6 +36,7 @@ architecture beh of pc_communication is
        signal zeile , zeile_next : hzeile;
        signal spalte_up, spalte_up_next : std_logic;
        signal get, get_next : std_logic;
+       signal new_i, new_i_next : std_logic;
 
        signal char, char_next : hbyte;
        signal char_en : std_logic;
@@ -48,6 +49,8 @@ begin
        d_zeile <= zeile;
        d_spalte <= spalte;
        d_get <= get;
+       char_next <= d_char;
+       tx_new <= new_i;
 
        sync: process (sys_clk, sys_res_n)
        begin
@@ -59,7 +62,7 @@ begin
                        zeile <= "0000000";
                        zeile_next <= "0000000";
                        get <= '0';
-                       tx_new <= '0';
+                       new_i <= '0';
                        tx_data <= "00000000";
                elsif rising_edge(sys_clk) then
                        push_history <= push_history_next;
@@ -67,8 +70,9 @@ begin
                        zeile <= zeile_next;
                        state <= state_next;
                        get <= get_next;
+                       new_i <= new_i_next;
                        if (char_en = '1') then
-                               state <= state_next;
+                               char <= char_next;
                        end if;
                end if;
        end process sync;
@@ -111,9 +115,10 @@ begin
        output_pc : process (state, zeile, spalte, char)
        begin
                get_next <= '0';
+               new_i_next <= '0';
                spalte_next <= "0000000";
                zeile_next <= "0000000";
-               case state is 
+               case state is
                        when IDLE =>
                                null;
                        when FETCH =>
@@ -122,7 +127,7 @@ begin
                        when FORWARD =>
                                char_en <= '0';
                                tx_data <= char;
-                               tx_new <= '1';
+                               new_i_next <= '1';
                        when DONE =>
                                null;
                end case;
@@ -135,7 +140,7 @@ begin
                        when IDLE =>
                                if rx_new = '1' or btn_a = '1' then
                                        state_next <= FETCH;
-                                       char <= d_char; --latch
+                                       
                                end if;
                        when FETCH =>
                                if (d_done = '1') then