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Diffstat (limited to 'lib/misc/components/buf_sync.vhd')
| -rw-r--r-- | lib/misc/components/buf_sync.vhd | 84 |
1 files changed, 84 insertions, 0 deletions
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;
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