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-------------------------------------------------------------------------------
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--
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-- Copyright (C) 2015
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-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>
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-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands
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--
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-- This program is free software: you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation, either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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--
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-------------------------------------------------------------------------------
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-- Purpose:
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-- . The dp_stream_stimuli generates as stream of packets with counter data.
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-- Description:
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--
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-- Remark:
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-- . The stimuli empty = 0 because the data in proc_dp_gen_block_data() is
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-- generated with one symbol per data (because symbol_w = data_w).
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--
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-- Usage:
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-- . See tb_dp_example_no_dut for usage example
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--
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LIBRARY IEEE, common_pkg_lib;
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USE IEEE.std_logic_1164.ALL;
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USE IEEE.numeric_std.ALL;
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USE common_pkg_lib.common_pkg.ALL;
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USE common_pkg_lib.common_lfsr_sequences_pkg.ALL;
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USE common_pkg_lib.tb_common_pkg.ALL;
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USE work.dp_stream_pkg.ALL;
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USE work.tb_dp_pkg.ALL;
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ENTITY dp_stream_stimuli IS
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GENERIC (
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g_instance_nr : NATURAL := 0;
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-- flow control
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g_random_w : NATURAL := 15; -- use different random width for stimuli and for verify to have different random sequences
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g_pulse_active : NATURAL := 1;
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g_pulse_period : NATURAL := 2;
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g_flow_control : t_dp_flow_control_enum := e_active; -- always active, random or pulse flow control
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-- initializations
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g_sync_period : NATURAL := 10;
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g_sync_offset : NATURAL := 0;
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g_data_init : NATURAL := 0; -- choose some easy to recognize and unique value, data will increment at every valid
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g_bsn_init : STD_LOGIC_VECTOR(c_dp_stream_bsn_w-1 DOWNTO 0) := TO_DP_BSN(0); -- X"0877665544332211", bsn will increment at every sop
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g_err_init : NATURAL := 247; -- choose some easy to recognize and unique value
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g_err_incr : NATURAL := 1; -- when 0 keep fixed at init value, when 1 increment at every sop
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g_channel_init : NATURAL := 5; -- choose some easy to recognize and unique value
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g_channel_incr : NATURAL := 1; -- when 0 keep fixed at init value, when 1 increment at every sop
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-- specific
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g_in_dat_w : NATURAL := 32;
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g_nof_repeat : NATURAL := 5;
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g_pkt_len : NATURAL := 16;
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g_pkt_gap : NATURAL := 4;
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g_wait_last_evt : NATURAL := 100 -- number of clk cycles to wait with last_snk_in_evt after finishing the stimuli
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);
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PORT (
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rst : IN STD_LOGIC;
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clk : IN STD_LOGIC;
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-- Generate stimuli
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src_in : IN t_dp_siso := c_dp_siso_rdy;
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src_out : OUT t_dp_sosi;
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-- End of stimuli
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last_snk_in : OUT t_dp_sosi; -- expected verify_snk_in after end of stimuli
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last_snk_in_evt : OUT STD_LOGIC; -- trigger verify to verify the last_snk_in
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tb_end : OUT STD_LOGIC -- signal end of tb as far as this dp_stream_stimuli is concerned
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);
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END dp_stream_stimuli;
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ARCHITECTURE str OF dp_stream_stimuli IS
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SIGNAL random : STD_LOGIC_VECTOR(g_random_w-1 DOWNTO 0) := TO_UVEC(g_instance_nr, g_random_w); -- use different initialization to have different random sequences per stream
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SIGNAL pulse : STD_LOGIC;
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SIGNAL pulse_en : STD_LOGIC := '1';
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SIGNAL stimuli_en : STD_LOGIC := '1';
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SIGNAL src_out_data : STD_LOGIC_VECTOR(g_in_dat_w-1 DOWNTO 0);
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SIGNAL i_src_out : t_dp_sosi;
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BEGIN
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src_out <= i_src_out;
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------------------------------------------------------------------------------
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-- STREAM CONTROL
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------------------------------------------------------------------------------
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random <= func_common_random(random) WHEN rising_edge(clk);
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proc_common_gen_duty_pulse(g_pulse_active, g_pulse_period, '1', rst, clk, pulse_en, pulse);
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stimuli_en <= '1' WHEN g_flow_control=e_active ELSE
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random(random'HIGH) WHEN g_flow_control=e_random ELSE
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pulse WHEN g_flow_control=e_pulse;
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------------------------------------------------------------------------------
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-- DATA GENERATION
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------------------------------------------------------------------------------
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-- Generate data path input data
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p_stimuli_st : PROCESS
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VARIABLE v_sosi : t_dp_sosi := c_dp_sosi_rst;
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VARIABLE v_last : t_dp_sosi := c_dp_sosi_rst;
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BEGIN
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-- Initialisations
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last_snk_in <= c_dp_sosi_rst;
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last_snk_in_evt <= '0';
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tb_end <= '0';
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-- Adjust initial sosi field values by -1 to compensate for auto increment
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v_sosi.bsn := INCR_UVEC(g_bsn_init, -1);
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v_sosi.channel := INCR_UVEC(TO_DP_CHANNEL(g_channel_init), -g_channel_incr);
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v_sosi.data := INCR_UVEC(TO_DP_DATA(g_data_init), -g_pkt_len);
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v_sosi.err := INCR_UVEC(TO_DP_ERROR(g_err_init), -g_err_incr);
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i_src_out <= c_dp_sosi_rst;
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proc_common_wait_until_low(clk, rst);
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proc_common_wait_some_cycles(clk, 5);
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-- Generate g_nof_repeat packets
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FOR I IN 0 TO g_nof_repeat-1 LOOP
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-- Auto increment v_sosi field values for this packet
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v_sosi.bsn := INCR_UVEC(v_sosi.bsn, 1);
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v_sosi.sync := sel_a_b((UNSIGNED(v_sosi.bsn) MOD g_sync_period) = g_sync_offset, '1', '0'); -- insert sync starting at BSN=g_sync_offset and with period g_sync_period
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v_sosi.channel := INCR_UVEC(v_sosi.channel, g_channel_incr);
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v_sosi.data := INCR_UVEC(v_sosi.data, g_pkt_len);
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v_sosi.data := RESIZE_DP_DATA(v_sosi.data(g_in_dat_w-1 DOWNTO 0)); -- wrap when >= 2**g_in_dat_w
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v_sosi.err := INCR_UVEC(v_sosi.err, g_err_incr);
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-- Send packet
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proc_dp_gen_block_data(g_in_dat_w, TO_UINT(v_sosi.data), g_pkt_len, TO_UINT(v_sosi.channel), TO_UINT(v_sosi.err), v_sosi.sync, v_sosi.bsn, clk, stimuli_en, src_in, i_src_out);
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-- Insert optional gap between the packets
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proc_common_wait_some_cycles(clk, g_pkt_gap);
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-- Update v_last.sync
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IF v_sosi.sync='1' THEN v_last.sync := '1'; END IF;
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END LOOP;
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-- Update v_last control
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IF g_nof_repeat>0 THEN
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v_last.sop := '1';
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v_last.eop := '1';
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v_last.valid := '1';
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END IF;
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-- Determine and keep last expected sosi field values after end of stimuli
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-- . e_qual
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v_last.bsn := STD_LOGIC_VECTOR( UNSIGNED(g_bsn_init) + g_nof_repeat-1);
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v_last.channel := TO_DP_CHANNEL(g_channel_init + (g_nof_repeat-1)*g_channel_incr);
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v_last.err := TO_DP_ERROR(g_err_init + (g_nof_repeat-1)*g_err_incr);
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-- . account for g_pkt_len
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v_last.data := INCR_UVEC(v_sosi.data, g_pkt_len-1);
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v_last.data := RESIZE_DP_DATA(v_last.data(g_in_dat_w-1 DOWNTO 0)); -- wrap when >= 2**g_in_dat_w
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last_snk_in <= v_last;
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-- Signal end of stimuli
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proc_common_wait_some_cycles(clk, g_wait_last_evt); -- latency from stimuli to verify depends on the flow control, so wait sufficiently long for last packet to have passed through
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proc_common_gen_pulse(clk, last_snk_in_evt);
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proc_common_wait_some_cycles(clk, 50);
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tb_end <= '1';
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WAIT;
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END PROCESS;
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------------------------------------------------------------------------------
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-- Auxiliary
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------------------------------------------------------------------------------
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-- Map to slv to ease monitoring in wave window
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src_out_data <= i_src_out.data(g_in_dat_w-1 DOWNTO 0);
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END str;
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