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------------------------------------------------------------------
---- ----
---- Content: testbench package ----
---- ----
---- Author: E. Theodore L. Omtzigt ----
---- theo@stillwater-sc.com ----
---- ----
------------------------------------------------------------------
---- ----
---- Copyright (C) 2017-2018 ----
---- E. Theodore L. Omtzigt ----
---- theo@stillwater-sc.com ----
---- ----
------------------------------------------------------------------
---- A posit is a tapered floating point representation. To compute
---- with posits, the regime and exponent fields need to be consolidated.
---- This process generates a triple (sign, exponent, significant).
---- These triples are the input values to the arithmetic units.
library ieee;
use ieee.std_logic_1164.all;
use std.textio.all;
package tb_pkg is
-- Procedure for clock generation
procedure clk_gen(signal clk : out std_logic; constant FREQ : real);
-- How to use
--architecture sim of tb is
-- -- Clock frequency and signal
-- signal clk_166 : std_logic;
-- signal clk_125 : std_logic;
--
--begin
--
-- -- Clock generation with concurrent procedure call
-- clk_gen(clk_166, 166.667E6); -- 166.667 MHz clock
-- clk_gen(clk_125, 125.000E6); -- 125.000 MHz clock
--
-- -- Time resolution show
-- assert FALSE report "Time resolution: " & time'image(time'succ(0 fs)) severity NOTE;
--
--end architecture;
--- trackError
function trackError(
condition : boolean;
message : String;
nrErrors : integer
) return integer;
end package;
package body tb_pkg is
-- Procedure for clock generation
procedure clk_gen(signal clk : out std_logic; constant FREQ : real) is
constant PERIOD : time := 1 sec / FREQ; -- Full period
constant HIGH_TIME : time := PERIOD / 2; -- High time
constant LOW_TIME : time := PERIOD - HIGH_TIME; -- Low time; always >= HIGH_TIME
begin
-- Check the arguments
assert (HIGH_TIME /= 0 fs) report "clk_plain: High time is zero; time resolution to large for frequency" severity FAILURE;
-- Generate a clock cycle
loop
clk <= '1';
wait for HIGH_TIME;
clk <= '0';
wait for LOW_TIME;
end loop;
end procedure;
-- trackError
function trackError(
condition : boolean;
message : String;
nrErrors : integer) return integer is
variable runningCount : integer;
begin
assert (condition) report message;
if condition = FALSE then
runningCount := nrErrors + 1;
else
runningCount := nrErrors;
end if;
return runningCount;
end function;
end package body;
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