From 82dcb83ed8cd6bfe5d79541a972028b650dc03c3 Mon Sep 17 00:00:00 2001
From: Tobias Klauser <tklauser@distanz.ch>
Date: Fri, 26 Mar 2010 15:25:16 +0100
Subject: Initial commit

---
 lib/misc/components/reset_sync.vhd | 88 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 lib/misc/components/reset_sync.vhd

(limited to 'lib/misc')

diff --git a/lib/misc/components/reset_sync.vhd b/lib/misc/components/reset_sync.vhd
new file mode 100644
index 0000000..27c1e78
--- /dev/null
+++ b/lib/misc/components/reset_sync.vhd
@@ -0,0 +1,88 @@
+------------------------------------------------------------------
+--  _____       ______  _____                                    -
+-- |_   _|     |  ____|/ ____|  Institute of Embedded Systems    -
+--   | |  _ __ | |__  | (___    Zuercher Hochschule fuer         -
+--   | | | '_ \|  __|  \___ \   angewandte Wissenschaften        -
+--  _| |_| | | | |____ ____) |  (University of Applied Sciences) -
+-- |_____|_| |_|______|_____/   8401 Winterthur, Switzerland     -
+------------------------------------------------------------------
+--
+-- Project     : SInet
+-- Module      : synthesis library ines_misc
+-- Description : reset synchronisytion
+--
+-- $LastChangedDate: 2008-10-31 12:06:00 +0100 (Fri, 31 Oct 2008) $
+-- $Rev: 1905 $
+-- $Author: ffar $
+-----------------------------------------------------------------
+--
+-- Change History
+-- Date     |Name      |Modification
+-----------------------------------------------------------------
+-- 02.11.07 | ffar     | file created based on library component
+-- 24.06.08 | kelt     | resets synchronized
+-----------------------------------------------------------------
+
+
+library ieee;
+  use ieee.std_logic_1164.all;
+
+package reset_sync_pkg is
+  component reset_sync
+    generic(
+      STAGES   : integer := 4
+    );
+    port(
+      clk_i      : in  std_logic;
+      reset1_n_i : in  std_logic;
+      reset2_n_i : in  std_logic := '1';
+      reset_n_o  : out std_logic := '0'
+    );
+  end component reset_sync;
+end package reset_sync_pkg;
+
+
+library ieee;
+  use ieee.std_logic_1164.all;
+  use ieee.numeric_std.all;
+
+entity reset_sync is
+  generic(
+    STAGES   : integer := 4
+  );
+  port(
+    clk_i      : in  std_logic;
+    reset1_n_i : in  std_logic;
+    reset2_n_i : in  std_logic := '1';
+    reset_n_o  : out std_logic := '0'
+  );
+end reset_sync;
+
+architecture rtl of reset_sync is
+
+  signal reset1_n_f, reset1_n_ff        : std_logic;
+  signal reset2_n_f, reset2_n_ff        : std_logic;
+
+begin
+
+  reset_prc : process(clk_i)
+    variable count : integer range 0 to STAGES-1 := 0;
+  begin
+    if clk_i'event and clk_i = '1' then
+      reset1_n_f    <= reset1_n_i;
+      reset1_n_ff   <= reset1_n_f;
+      reset2_n_f    <= reset2_n_i;
+      reset2_n_ff   <= reset2_n_f;
+      if (reset1_n_ff and reset2_n_ff) = '0' then
+        reset_n_o   <= '0';
+        count       :=  0;
+      elsif count < STAGES-1 then
+        reset_n_o   <= '0';
+        count       := count + 1;
+      else
+        reset_n_o   <= '1';
+      end if;
+    end if;
+  end process reset_prc;
+
+end rtl;
\ No newline at end of file
-- 
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