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[/] [pcie_sg_dma/] [branches/] [Virtex6/] [ML605_ISE12.3/] [ipcore_dir_ISE12.1/] [v6_pcie_v1_6/] [simulation/] [functional/] [sys_clk_gen.vhd] - Rev 11
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------------------------------------------------------------------------------- -- -- (c) Copyright 2009-2010 Xilinx, Inc. All rights reserved. -- -- This file contains confidential and proprietary information -- of Xilinx, Inc. and is protected under U.S. and -- international copyright and other intellectual property -- laws. -- -- DISCLAIMER -- This disclaimer is not a license and does not grant any -- rights to the materials distributed herewith. Except as -- otherwise provided in a valid license issued to you by -- Xilinx, and to the maximum extent permitted by applicable -- law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND -- WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES -- AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING -- BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON- -- INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and -- (2) Xilinx shall not be liable (whether in contract or tort, -- including negligence, or under any other theory of -- liability) for any loss or damage of any kind or nature -- related to, arising under or in connection with these -- materials, including for any direct, or any indirect, -- special, incidental, or consequential loss or damage -- (including loss of data, profits, goodwill, or any type of -- loss or damage suffered as a result of any action brought -- by a third party) even if such damage or loss was -- reasonably foreseeable or Xilinx had been advised of the -- possibility of the same. -- -- CRITICAL APPLICATIONS -- Xilinx products are not designed or intended to be fail- -- safe, or for use in any application requiring fail-safe -- performance, such as life-support or safety devices or -- systems, Class III medical devices, nuclear facilities, -- applications related to the deployment of airbags, or any -- other applications that could lead to death, personal -- injury, or severe property or environmental damage -- (individually and collectively, "Critical -- Applications"). Customer assumes the sole risk and -- liability of any use of Xilinx products in Critical -- Applications, subject only to applicable laws and -- regulations governing limitations on product liability. -- -- THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS -- PART OF THIS FILE AT ALL TIMES. -- ------------------------------------------------------------------------------- -- Project : Virtex-6 Integrated Block for PCI Express -- File : sys_clk_gen.vhd -- Version : 1.6 -- -------------------------------------------------------------------------------- library ieee; use ieee.std_logic_1164.all; entity sys_clk_gen is generic ( CLK_FREQ : INTEGER := 250 ); port ( sys_clk : out std_logic ); end sys_clk_gen; architecture rtl of sys_clk_gen is constant freq : integer := CLK_FREQ; constant halfcycle : TIME := 1 us/(2*freq); signal sys_clk_c : std_logic := '0'; begin sys_clk <= sys_clk_c; sys_clk_c <= not sys_clk_c after halfcycle; end; -- sys_clk_gen