From 63fc34f66a07c2088c20d8da0e6114112865a65b Mon Sep 17 00:00:00 2001
From: tmeissner <programming@goodcleanfun.de>
Date: Thu, 27 Dec 2018 23:43:54 +0100
Subject: [PATCH] Add DoutValid_o to condition for state change in putput
 states

---
 vai_reg/vai_reg.vhd | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/vai_reg/vai_reg.vhd b/vai_reg/vai_reg.vhd
index b07e8f5..41975a7 100644
--- a/vai_reg/vai_reg.vhd
+++ b/vai_reg/vai_reg.vhd
@@ -42,6 +42,7 @@ architecture rtl of vai_reg is
   signal s_data   : std_logic_vector(7 downto 0);
 
   signal s_error : boolean;
+  signal s_dout_accepted : boolean;
 
   alias a_addr : std_logic_vector(3 downto 0) is s_header(7 downto 4);
 
@@ -49,6 +50,10 @@ architecture rtl of vai_reg is
 begin
 
 
+  s_dout_accepted <= true when DoutValid_o = '1' and DoutAccept_i = '1' else
+                     false;
+
+
   process (Reset_n_i, Clk_i) is
   begin
     if (Reset_n_i = '0') then
@@ -123,7 +128,7 @@ begin
           DoutValid_o <= '1';
           DoutStart_o <= '1';
           Dout_o      <= s_header;
-          if (DoutAccept_i = '1') then
+          if (s_dout_accepted) then
             DoutValid_o <= '0';
             DoutStart_o <= '0';
             if (s_header(3 downto 0) = C_WRITE) then
@@ -136,7 +141,7 @@ begin
         when SEND_DATA =>
           DoutValid_o <= '1';
           Dout_o      <= s_data;
-          if (DoutAccept_i = '1') then
+          if (s_dout_accepted) then
             DoutValid_o <= '0';
             s_fsm_state <= SEND_FOOTER;
           end if;
@@ -145,7 +150,7 @@ begin
           DoutValid_o <= '1';
           DoutStop_o  <= '1';
           Dout_o      <= x"01" when s_error else x"00";
-          if (DoutAccept_i = '1') then
+          if (s_dout_accepted) then
             Dout_o      <= (others => '0');
             DoutValid_o <= '0';
             DoutStop_o  <= '0';