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-- Legal Notice: Copyright 2017 Intel Corporation. All rights reserved.
-- Your use of Intel Corporation's design tools, logic functions and other
-- software and tools, and its AMPP partner logic functions, and any output
-- files any of the foregoing device programming or simulation files), and
-- any associated documentation or information are expressly subject to the
-- terms and conditions of the Intel FPGA Software License Agreement,
-- Intel MegaCore Function License Agreement, or other applicable license
-- agreement, including, without limitation, that your use is for the sole
-- purpose of programming logic devices manufactured by Intel and sold by
-- Intel or its authorized distributors. Please refer to the applicable
-- agreement for further details.
library IEEE;
use IEEE.std_logic_1164.all;
use work.dspba_library_package.all;
entity dspba_delay is
generic (
width : natural := 8;
depth : natural := 1;
reset_high : std_logic := '1';
reset_kind : string := "ASYNC"
);
port (
clk : in std_logic;
aclr : in std_logic;
ena : in std_logic := '1';
xin : in std_logic_vector(width-1 downto 0);
xout : out std_logic_vector(width-1 downto 0)
);
end dspba_delay;
architecture delay of dspba_delay is
type delay_array is array (depth downto 0) of std_logic_vector(width-1 downto 0);
signal delay_signals : delay_array;
begin
delay_signals(depth) <= xin;
delay_block: if 0 < depth generate
begin
delay_loop: for i in depth-1 downto 0 generate
begin
async_reset: if reset_kind = "ASYNC" generate
process(clk, aclr)
begin
if aclr=reset_high then
delay_signals(i) <= (others => '0');
elsif clk'event and clk='1' then
if ena='1' then
delay_signals(i) <= delay_signals(i + 1);
end if;
end if;
end process;
end generate;
sync_reset: if reset_kind = "SYNC" generate
process(clk)
begin
if clk'event and clk='1' then
if aclr=reset_high then
delay_signals(i) <= (others => '0');
elsif ena='1' then
delay_signals(i) <= delay_signals(i + 1);
end if;
end if;
end process;
end generate;
no_reset: if reset_kind = "NONE" generate
process(clk)
begin
if clk'event and clk='1' then
if ena='1' then
delay_signals(i) <= delay_signals(i + 1);
end if;
end if;
end process;
end generate;
end generate;
end generate;
xout <= delay_signals(0);
end delay;
--------------------------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.NUMERIC_STD.all;
use work.dspba_library_package.all;
entity dspba_sync_reg is
generic (
width1 : natural := 8;
init_value : std_logic_vector;
width2 : natural := 8;
depth : natural := 2;
pulse_multiplier : natural := 1;
counter_width : natural := 8;
reset1_high : std_logic := '1';
reset2_high : std_logic := '1';
reset_kind : string := "ASYNC"
);
port (
clk1 : in std_logic;
aclr1 : in std_logic;
ena : in std_logic_vector(0 downto 0);
xin : in std_logic_vector(width1-1 downto 0);
xout : out std_logic_vector(width1-1 downto 0);
clk2 : in std_logic;
aclr2 : in std_logic;
sxout : out std_logic_vector(width2-1 downto 0)
);
end entity;
architecture sync_reg of dspba_sync_reg is
type bit_array is array (depth-1 downto 0) of std_logic;
signal iclk_enable : std_logic;
signal iclk_data : std_logic_vector(width1-1 downto 0);
signal oclk_data : std_logic_vector(width2-1 downto 0);
-- For Synthesis this means: preserve this registers and do not merge any other flip-flops with synchronizer flip-flops
-- For TimeQuest this means: identify these flip-flops as synchronizer to enable automatic MTBF analysis
signal sync_regs : bit_array;
attribute altera_attribute : string;
attribute altera_attribute of sync_regs : signal is "-name ADV_NETLIST_OPT_ALLOWED NEVER_ALLOW; -name SYNCHRONIZER_IDENTIFICATION FORCED_IF_ASYNCHRONOUS; -name DONT_MERGE_REGISTER ON; -name PRESERVE_REGISTER ON";
signal oclk_enable : std_logic;
constant init_value_internal : std_logic_vector(width1-1 downto 0) := init_value;
signal counter : UNSIGNED(counter_width-1 downto 0);
signal ena_internal : std_logic;
begin
oclk_enable <= sync_regs(depth-1);
no_multiplication: if pulse_multiplier=1 generate
ena_internal <= ena(0);
end generate;
async_reset: if reset_kind="ASYNC" generate
multiply_ena: if pulse_multiplier>1 generate
ena_internal <= '1' when counter>0 else ena(0);
process (clk1, aclr1)
begin
if aclr1=reset1_high then
counter <= (others => '0');
elsif clk1'event and clk1='1' then
if counter>0 then
if counter=pulse_multiplier-1 then
counter <= (others => '0');
else
counter <= counter + TO_UNSIGNED(1, counter_width);
end if;
else
if ena(0)='1' then
counter <= TO_UNSIGNED(1, counter_width);
end if;
end if;
end if;
end process;
end generate;
process (clk1, aclr1)
begin
if aclr1=reset1_high then
iclk_enable <= '0';
iclk_data <= init_value_internal;
elsif clk1'event and clk1='1' then
iclk_enable <= ena_internal;
if ena(0)='1' then
iclk_data <= xin;
end if;
end if;
end process;
sync_reg_loop: for i in 0 to depth-1 generate
process (clk2, aclr2)
begin
if aclr2=reset2_high then
sync_regs(i) <= '0';
elsif clk2'event and clk2='1' then
if i>0 then
sync_regs(i) <= sync_regs(i-1);
else
sync_regs(i) <= iclk_enable;
end if;
end if;
end process;
end generate;
process (clk2, aclr2)
begin
if aclr2=reset2_high then
oclk_data <= init_value_internal(width2-1 downto 0);
elsif clk2'event and clk2='1' then
if oclk_enable='1' then
oclk_data <= iclk_data(width2-1 downto 0);
end if;
end if;
end process;
end generate;
sync_reset: if reset_kind="SYNC" generate
multiply_ena: if pulse_multiplier>1 generate
ena_internal <= '1' when counter>0 else ena(0);
process (clk1)
begin
if clk1'event and clk1='1' then
if aclr1=reset1_high then
counter <= (others => '0');
else
if counter>0 then
if counter=pulse_multiplier-1 then
counter <= (others => '0');
else
counter <= counter + TO_UNSIGNED(1, counter_width);
end if;
else
if ena(0)='1' then
counter <= TO_UNSIGNED(1, counter_width);
end if;
end if;
end if;
end if;
end process;
end generate;
process (clk1)
begin
if clk1'event and clk1='1' then
if aclr1=reset1_high then
iclk_enable <= '0';
iclk_data <= init_value_internal;
else
iclk_enable <= ena_internal;
if ena(0)='1' then
iclk_data <= xin;
end if;
end if;
end if;
end process;
sync_reg_loop: for i in 0 to depth-1 generate
process (clk2)
begin
if clk2'event and clk2='1' then
if aclr2=reset2_high then
sync_regs(i) <= '0';
else
if i>0 then
sync_regs(i) <= sync_regs(i-1);
else
sync_regs(i) <= iclk_enable;
end if;
end if;
end if;
end process;
end generate;
process (clk2)
begin
if clk2'event and clk2='1' then
if aclr2=reset2_high then
oclk_data <= init_value_internal(width2-1 downto 0);
elsif oclk_enable='1' then
oclk_data <= iclk_data(width2-1 downto 0);
end if;
end if;
end process;
end generate;
none_reset: if reset_kind="NONE" generate
multiply_ena: if pulse_multiplier>1 generate
ena_internal <= '1' when counter>0 else ena(0);
process (clk1, aclr1)
begin
if clk1'event and clk1='1' then
if counter>0 then
if counter=pulse_multiplier-1 then
counter <= (others => '0');
else
counter <= counter + TO_UNSIGNED(1, counter_width);
end if;
else
if ena(0)='1' then
counter <= TO_UNSIGNED(1, counter_width);
end if;
end if;
end if;
end process;
end generate;
process (clk1)
begin
if clk1'event and clk1='1' then
iclk_enable <= ena_internal;
if ena(0)='1' then
iclk_data <= xin;
end if;
end if;
end process;
sync_reg_loop: for i in 0 to depth-1 generate
process (clk2)
begin
if clk2'event and clk2='1' then
if i>0 then
sync_regs(i) <= sync_regs(i-1);
else
sync_regs(i) <= iclk_enable;
end if;
end if;
end process;
end generate;
process (clk2)
begin
if clk2'event and clk2='1' then
if oclk_enable='1' then
oclk_data <= iclk_data(width2-1 downto 0);
end if;
end if;
end process;
end generate;
xout <= iclk_data;
sxout <= oclk_data;
end sync_reg;
--------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity dspba_pipe is
generic(
num_bits : positive := 8;
num_stages : natural := 0;
init_value : std_logic := 'X'
);
port(
clk: in std_logic;
d : in std_logic_vector(num_bits-1 downto 0);
q : out std_logic_vector(num_bits-1 downto 0)
);
end entity dspba_pipe;
architecture rtl of dspba_pipe is
attribute altera_attribute : string;
attribute altera_attribute of rtl : architecture is "-name AUTO_SHIFT_REGISTER_RECOGNITION off";
type stage_array_type is array(0 to num_stages) of std_logic_vector(num_bits-1 downto 0);
signal stage_array : stage_array_type := (others => (others => init_value));
begin
stage_array(0) <= d;
g_pipe : for i in 1 to num_stages generate
p_stage : process (clk) is
begin
if rising_edge(clk) then
stage_array(i) <= stage_array(i-1);
end if;
end process p_stage;
end generate g_pipe;
q <= stage_array(num_stages);
end rtl;
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