From: Cahit <c.ugur@gsi.de>
Date: Tue, 26 Jan 2016 08:26:46 +0000 (+0100)
Subject: delayes BUS HANDLER read signal one clock cycle to match the MULTICYCLE constraint
X-Git-Tag: v2.3~55
X-Git-Url: https://jspc29.x-matter.uni-frankfurt.de/git/?a=commitdiff_plain;h=36f7c5ebe78a152c74042aca31ae78d1738214e6;p=tdc.git

delayes BUS HANDLER read signal one clock cycle to match the MULTICYCLE constraint
---

diff --git a/releases/tdc_v2.3/BusHandler_record.vhd b/releases/tdc_v2.3/BusHandler_record.vhd
index ffcfb09..316bd68 100644
--- a/releases/tdc_v2.3/BusHandler_record.vhd
+++ b/releases/tdc_v2.3/BusHandler_record.vhd
@@ -22,10 +22,11 @@ end BusHandler_record;
 architecture Behavioral of BusHandler_record is
 
   --Output signals
-  signal rx_data  : std_logic_vector(31 downto 0);
-  signal rx_read  : std_logic;
-  signal rx_write : std_logic;
-  signal rx_addr  : std_logic_vector(6 downto 0);
+  signal rx_data   : std_logic_vector(31 downto 0);
+  signal rx_read   : std_logic;
+  signal rx_read_r : std_logic;
+  signal rx_write  : std_logic;
+  signal rx_addr   : std_logic_vector(6 downto 0);
   
 begin
 
@@ -40,21 +41,22 @@ begin
       BUS_TX.ack     <= '0';
       BUS_TX.unknown <= '0';
       BUS_TX.nack    <= '0';
+      rx_read_r      <= rx_read;
       
-      if rx_read = '1' then
+      if rx_read_r = '1' then
         if to_integer(unsigned(rx_addr)) > BUS_LENGTH then  -- if bigger than 64
           BUS_TX.unknown <= '1';
         else
-          BUS_TX.data    <= DATA_IN(to_integer(unsigned(rx_addr)));
-          BUS_TX.ack     <= '1';
+          BUS_TX.data <= DATA_IN(to_integer(unsigned(rx_addr)));
+          BUS_TX.ack  <= '1';
         end if;
       elsif rx_write = '1' then
         if to_integer(unsigned(rx_addr)) > BUS_LENGTH then  -- if bigger than 64
           BUS_TX.unknown <= '1';
-        else  
+        else
           DATA_OUT(to_integer(unsigned(rx_addr))) <= rx_data;
-          BUS_TX.ack     <= '1';
-        end if;  
+          BUS_TX.ack                              <= '1';
+        end if;
       end if;
     end if;
   end process READ_WRITE_RESPONSE;