From 98feedbabc40f4faea1654419ddf6748ee850955 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Thu, 3 May 2012 08:40:31 +0200
Subject: Add more InES clock sync stuff

---
 lib/misc/components/buf_sync.vhd   | 84 ++++++++++++++++++++++++++++++++++++++
 lib/misc/components/input_sync.vhd | 75 ++++++++++++++++++++++++++++++++++
 2 files changed, 159 insertions(+)
 create mode 100644 lib/misc/components/buf_sync.vhd
 create mode 100644 lib/misc/components/input_sync.vhd

diff --git a/lib/misc/components/buf_sync.vhd b/lib/misc/components/buf_sync.vhd
new file mode 100644
index 0000000..bcc48ad
--- /dev/null
+++ b/lib/misc/components/buf_sync.vhd
@@ -0,0 +1,84 @@
+------------------------------------------------------------------
+--  _____       ______  _____                                    -
+-- |_   _|     |  ____|/ ____|  Institute of Embedded Systems    -
+--   | |  _ __ | |__  | (___    Zuercher Hochschule fuer         -
+--   | | | '_ \|  __|  \___ \   angewandte Wissenschaften        -
+--  _| |_| | | | |____ ____) |  (University of Applied Sciences) -
+-- |_____|_| |_|______|_____/   8401 Winterthur, Switzerland     -
+------------------------------------------------------------------
+--
+-- Project     : InES library
+-- Module      : library ines_misc
+-- Description : port buffer with clock domain syncronisation
+--
+-- $LastChangedDate$
+-- $Rev $
+-- $Author $
+-----------------------------------------------------------------
+--
+-- Change History
+-- Date     |Name      |Modification
+------------|----------|-----------------------------------------
+-- 20.06.08 | ffar     |file created
+-----------------------------------------------------------------
+
+
+library ieee;
+  use ieee.std_logic_1164.all;
+
+package buf_sync_pkg is
+  component buf_sync
+  generic(
+    G_NUM_BUF : natural := 1
+  );
+  port(
+    clk_i     : in  std_logic;
+    reset_n_i : in  std_logic;
+    inp_i     : in  std_logic_vector(G_NUM_BUF-1 downto 0);
+    outp_o    : out std_logic_vector(G_NUM_BUF-1 downto 0)
+  );
+  end component buf_sync;
+end package buf_sync_pkg;
+
+
+
+library ieee;
+  use ieee.std_logic_1164.all;
+
+
+entity buf_sync is
+  generic(
+    G_NUM_BUF : natural := 1
+  );
+  port(
+    clk_i     : in  std_logic;
+    reset_n_i : in  std_logic;
+    inp_i     : in  std_logic_vector(G_NUM_BUF-1 downto 0);
+    outp_o    : out std_logic_vector(G_NUM_BUF-1 downto 0)
+  );
+end buf_sync;
+
+architecture rtl of buf_sync is
+
+  signal inp_f  : std_logic_vector(inp_i'range);
+  signal inp_ff : std_logic_vector(inp_i'range);
+
+begin
+
+  outp_o <= inp_ff;
+
+  ff_gen : for i in inp_i'range generate
+  begin
+    ff_prc :   process(clk_i, reset_n_i)
+    begin
+      if reset_n_i = '0' then
+        inp_f(i)  <= '0';
+        inp_ff(i) <= '0';
+      elsif clk_i'event and clk_i = '1' then  -- Creates the flipflops
+        inp_f(i)  <= inp_i(i);
+        inp_ff(i) <= inp_f(i);
+      end if;
+    end process ff_prc;
+  end generate ff_gen;
+
+end rtl;
\ No newline at end of file
diff --git a/lib/misc/components/input_sync.vhd b/lib/misc/components/input_sync.vhd
new file mode 100644
index 0000000..4e3ac57
--- /dev/null
+++ b/lib/misc/components/input_sync.vhd
@@ -0,0 +1,75 @@
+------------------------------------------------------------------
+--  _____       ______  _____                                    -
+-- |_   _|     |  ____|/ ____|  Institute of Embedded Systems    -
+--   | |  _ __ | |__  | (___    Zuercher Hochschule fuer         -
+--   | | | '_ \|  __|  \___ \   angewandte Wissenschaften        -
+--  _| |_| | | | |____ ____) |  (University of Applied Sciences) -
+-- |_____|_| |_|______|_____/   8401 Winterthur, Switzerland     -
+------------------------------------------------------------------
+--
+-- Project     : SInet
+-- Module      : synthesis library ines_misc
+-- Description : input synchronisytion
+--
+-- $LastChangedDate $
+-- $Rev$
+-- $Author$
+-----------------------------------------------------------------
+--
+-- Change History
+-- Date     |Name      |Modification
+-----------------------------------------------------------------
+-- 01.02.08 | ffar + beut     | file created based on library component
+-----------------------------------------------------------------
+
+
+library ieee;
+  use ieee.std_logic_1164.all;
+
+package input_sync_pkg is
+  component input_sync
+    generic(
+      G_INIT_VALUE      : std_logic := '0'
+    );
+    port(
+      clk_i             : in  std_logic;
+      reset_n_i         : in  std_logic;
+      async_signal_i    : in  std_logic;
+      sync_signal_o     : out std_logic 
+    );
+  end component input_sync;
+end package input_sync_pkg;
+
+
+library ieee;
+  use ieee.std_logic_1164.all;
+  use ieee.numeric_std.all;
+
+entity input_sync is
+  generic(
+      G_INIT_VALUE      : std_logic := '0'
+    );
+    port(
+      clk_i             : in  std_logic;
+      reset_n_i         : in  std_logic;
+      async_signal_i     : in  std_logic;
+      sync_signal_o     : out std_logic 
+    );
+  end input_sync;
+
+architecture rtl of input_sync is
+
+ signal sync_signal_f     : std_logic;
+
+begin
+    sync_prc : process(clk_i, reset_n_i, async_signal_i, sync_signal_f)
+    begin
+      if reset_n_i = '0' then
+        sync_signal_f      <= G_INIT_VALUE;
+        sync_signal_o      <= G_INIT_VALUE;
+      elsif clk_i'event and clk_i = '1' then
+        sync_signal_f      <= async_signal_i;
+        sync_signal_o      <= sync_signal_f;
+      end if;
+    end process sync_prc;
+end rtl;
\ No newline at end of file
-- 
cgit v1.2.3-54-g00ecf