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-- EMACS settings: -*- tab-width: 2; indent-tabs-mode: t -*-
-- vim: tabstop=2:shiftwidth=2:noexpandtab
-- kate: tab-width 2; replace-tabs off; indent-width 2;
--
-- ============================================================================
-- Module: uart_rx_tb
--
-- Authors: Patrick Lehmann
--
-- Description:
-- ------------------------------------
-- Testbench for arith_counter_bcd
--
-- License:
-- ============================================================================
-- Copyright 2007-2015 Technische Universitaet Dresden - Germany
-- Chair for VLSI-Design, Diagnostics and Architecture
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.
-- ============================================================================
library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;
library PoC;
use PoC.utils.all;
use PoC.vectors.all;
use PoC.strings.all;
use PoC.physical.all;
use PoC.simulation.all;
use PoC.uart.all;
entity uart_rx_tb is
end entity;
architecture tb of uart_rx_tb is
constant CLOCK_FREQ : FREQ := 100 MHz;
constant BAUDRATE : BAUD := 4.2 MBd;
signal Clock : STD_LOGIC;
signal Reset : STD_LOGIC;
signal BitClock : STD_LOGIC;
signal BitClock_x8 : STD_LOGIC;
signal UART_RX : STD_LOGIC;
signal RX_Strobe : STD_LOGIC;
signal RX_Data : T_SLV_8;
function simGenerateWaveform_UART_Word(Data : T_SLV_8; Baudrate : BAUD := 115.200 kBd) return T_SIM_WAVEFORM_SL is
constant BIT_TIME : TIME := to_time(to_freq(Baudrate));
variable Result : T_SIM_WAVEFORM_SL(0 to 9) := (others => (Delay => BIT_TIME, Value => '-'));
begin
Result(0).Value := '0';
for i in Data'range loop
Result(i + 1).Value := Data(i);
end loop;
Result(9).Value := '1';
return Result;
end function;
function simGenerateWaveform_UART_Stream(Data : T_SLVV_8; Baudrate : BAUD := 115.200 kBd) return T_SIM_WAVEFORM_SL is
variable Result : T_SIM_WAVEFORM_SL(0 to (Data'length * 10) - 1);
begin
for i in Data'range loop
Result(i * 10 to ((i + 1) * 10) - 1) := simGenerateWaveform_UART_Word(Data(i), BAUDRATE);
end loop;
return Result;
end function;
constant DATA_STREAM : T_SLVV_8 := (x"12", x"45", x"FE", x"C4", x"02");
begin
simGenerateClock(Clock, CLOCK_FREQ);
simGenerateWaveform(Reset, simGenerateWaveform_Reset(Pause => 50 ns));
p1f: if true generate
simGenerateWaveform(UART_RX, simGenerateWaveform_UART_Stream(DATA_STREAM, BAUDRATE), '1');
end generate;
p1t: if false generate
process
constant wf : T_SIM_WAVEFORM_SL := simGenerateWaveform_UART_Stream(DATA_STREAM, BAUDRATE);
begin
simGenerateWaveform(UART_RX, wf, '1');
end process;
end generate;
bclk : entity PoC.uart_bclk
generic map (
CLOCK_FREQ => CLOCK_FREQ,
BAUDRATE => BAUDRATE
)
port map (
clk => Clock,
rst => Reset,
bclk => BitClock,
bclk_x8 => BitClock_x8
);
RX : entity PoC.uart_rx
generic map (
OUT_REGS => FALSE
)
port map (
clk => Clock,
rst => Reset,
bclk_x8 => BitClock_x8,
dos => RX_Strobe,
dout => RX_Data,
rxd => UART_RX
);
process
begin
for i in DATA_STREAM'range loop
wait until rising_edge(Clock) and (RX_Strobe = '1');
report TIME'image(NOW) severity NOTE;
tbAssert((RX_Data = DATA_STREAM(i)), "Data Byte " & INTEGER'image(i) & " received: " & to_string(RX_Data, 'h') & " expected: " & to_string(DATA_STREAM(i), 'h'));
end loop;
wait for 1 us;
simStop;
tbPrintResult;
wait;
end process;
end architecture;
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