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rfnoc_block_ddc_tb.sv
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//
// Copyright 2019 Ettus Research, a National Instruments Company
//
// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Module: rfnoc_block_ddc_tb
//
// Description: Testbench for rfnoc_block_ddc
//
module rfnoc_block_ddc_tb();
// Include macros and time declarations for use with PkgTestExec
`include "test_exec.svh"
import PkgTestExec::*;
import PkgChdrUtils::*;
import PkgRfnocBlockCtrlBfm::*;
`include "rfnoc_block_ddc_regs.vh"
//---------------------------------------------------------------------------
// Local Parameters
//---------------------------------------------------------------------------
// Simulation parameters
localparam real CHDR_CLK_PER = 5.0; // CHDR clock rate
localparam real DDC_CLK_PER = 4.0; // DUC IP clock rate
localparam int EXTENDED_TEST = 0; // Perform a longer test
localparam int SPP = 256; // Samples per packet
localparam int PKT_SIZE_BYTES = SPP*4; // Bytes per packet
localparam int STALL_PROB = 25; // BFM stall probability
// Block configuration
localparam int CHDR_W = 64;
localparam int SAMP_W = 32;
localparam int THIS_PORTID = 'h123;
localparam int MTU = 8;
localparam int NUM_PORTS = 1;
localparam int NUM_HB = 3;
localparam int CIC_MAX_DECIM = 255;
localparam int NOC_ID = 32'hDDC00000;
//---------------------------------------------------------------------------
// Clocks
//---------------------------------------------------------------------------
bit rfnoc_chdr_clk;
bit rfnoc_ctrl_clk;
bit ce_clk;
sim_clock_gen #(CHDR_CLK_PER) rfnoc_chdr_clk_gen (.clk(rfnoc_chdr_clk), .rst());
sim_clock_gen #(CHDR_CLK_PER) rfnoc_ctrl_clk_gen (.clk(rfnoc_ctrl_clk), .rst());
sim_clock_gen #(DDC_CLK_PER) ddc_clk_gen (.clk(ce_clk), .rst());
//---------------------------------------------------------------------------
// Bus Functional Models
//---------------------------------------------------------------------------
typedef ChdrData #(CHDR_W, SAMP_W)::chdr_word_t chdr_word_t;
RfnocBackendIf backend (rfnoc_chdr_clk, rfnoc_ctrl_clk);
AxiStreamIf #(32) m_ctrl (rfnoc_ctrl_clk, 1'b0);
AxiStreamIf #(32) s_ctrl (rfnoc_ctrl_clk, 1'b0);
AxiStreamIf #(CHDR_W) m_chdr [NUM_PORTS] (rfnoc_chdr_clk, 1'b0);
AxiStreamIf #(CHDR_W) s_chdr [NUM_PORTS] (rfnoc_chdr_clk, 1'b0);
// Bus functional model for a software block controller
RfnocBlockCtrlBfm #(CHDR_W, SAMP_W) blk_ctrl =
new(backend, m_ctrl, s_ctrl);
// Connect block controller to BFMs
for (genvar i = 0; i < NUM_PORTS; i++) begin : gen_bfm_connections
initial begin
blk_ctrl.connect_master_data_port(i, m_chdr[i], PKT_SIZE_BYTES);
blk_ctrl.connect_slave_data_port(i, s_chdr[i]);
blk_ctrl.set_master_stall_prob(i, STALL_PROB);
blk_ctrl.set_slave_stall_prob(i, STALL_PROB);
end
end
//---------------------------------------------------------------------------
// DUT
//---------------------------------------------------------------------------
logic [NUM_PORTS*CHDR_W-1:0] s_rfnoc_chdr_tdata;
logic [ NUM_PORTS-1:0] s_rfnoc_chdr_tlast;
logic [ NUM_PORTS-1:0] s_rfnoc_chdr_tvalid;
logic [ NUM_PORTS-1:0] s_rfnoc_chdr_tready;
logic [NUM_PORTS*CHDR_W-1:0] m_rfnoc_chdr_tdata;
logic [ NUM_PORTS-1:0] m_rfnoc_chdr_tlast;
logic [ NUM_PORTS-1:0] m_rfnoc_chdr_tvalid;
logic [ NUM_PORTS-1:0] m_rfnoc_chdr_tready;
// Map the array of BFMs to a flat vector for the DUT
genvar i;
for (i = 0; i < NUM_PORTS; i++) begin : gen_dut_connections
// Connect BFM master to DUT slave port
assign s_rfnoc_chdr_tdata[CHDR_W*i+:CHDR_W] = m_chdr[i].tdata;
assign s_rfnoc_chdr_tlast[i] = m_chdr[i].tlast;
assign s_rfnoc_chdr_tvalid[i] = m_chdr[i].tvalid;
assign m_chdr[i].tready = s_rfnoc_chdr_tready[i];
// Connect BFM slave to DUT master port
assign s_chdr[i].tdata = m_rfnoc_chdr_tdata[CHDR_W*i+:CHDR_W];
assign s_chdr[i].tlast = m_rfnoc_chdr_tlast[i];
assign s_chdr[i].tvalid = m_rfnoc_chdr_tvalid[i];
assign m_rfnoc_chdr_tready[i] = s_chdr[i].tready;
end
rfnoc_block_ddc #(
.THIS_PORTID (THIS_PORTID),
.CHDR_W (CHDR_W),
.NUM_PORTS (NUM_PORTS),
.MTU (MTU),
.NUM_HB (NUM_HB),
.CIC_MAX_DECIM (CIC_MAX_DECIM)
) rfnoc_block_ddc_i (
.rfnoc_chdr_clk (backend.chdr_clk),
.ce_clk (ce_clk),
.s_rfnoc_chdr_tdata (s_rfnoc_chdr_tdata),
.s_rfnoc_chdr_tlast (s_rfnoc_chdr_tlast),
.s_rfnoc_chdr_tvalid (s_rfnoc_chdr_tvalid),
.s_rfnoc_chdr_tready (s_rfnoc_chdr_tready),
.m_rfnoc_chdr_tdata (m_rfnoc_chdr_tdata),
.m_rfnoc_chdr_tlast (m_rfnoc_chdr_tlast),
.m_rfnoc_chdr_tvalid (m_rfnoc_chdr_tvalid),
.m_rfnoc_chdr_tready (m_rfnoc_chdr_tready),
.rfnoc_core_config (backend.cfg),
.rfnoc_core_status (backend.sts),
.rfnoc_ctrl_clk (backend.ctrl_clk),
.s_rfnoc_ctrl_tdata (m_ctrl.tdata),
.s_rfnoc_ctrl_tlast (m_ctrl.tlast),
.s_rfnoc_ctrl_tvalid (m_ctrl.tvalid),
.s_rfnoc_ctrl_tready (m_ctrl.tready),
.m_rfnoc_ctrl_tdata (s_ctrl.tdata),
.m_rfnoc_ctrl_tlast (s_ctrl.tlast),
.m_rfnoc_ctrl_tvalid (s_ctrl.tvalid),
.m_rfnoc_ctrl_tready (s_ctrl.tready)
);
//---------------------------------------------------------------------------
// Helper Tasks
//---------------------------------------------------------------------------
// Translate the desired register access to a ctrlport write request.
task automatic write_reg(int port, byte addr, bit [31:0] value);
blk_ctrl.reg_write(256*8*port + addr*8, value);
endtask : write_reg
// Translate the desired register access to a ctrlport read request.
task automatic read_user_reg(int port, byte addr, output logic [63:0] value);
blk_ctrl.reg_read(256*8*port + addr*8 + 0, value[31: 0]);
blk_ctrl.reg_read(256*8*port + addr*8 + 4, value[63:32]);
endtask : read_user_reg
task automatic set_decim_rate(int port, input int decim_rate);
logic [7:0] cic_rate;
logic [1:0] hb_enables;
int _decim_rate;
cic_rate = 8'd0;
hb_enables = 2'b0;
_decim_rate = decim_rate;
// Calculate which half bands to enable and whatever is left over set the CIC
while ((_decim_rate[0] == 0) && (hb_enables < NUM_HB)) begin
hb_enables += 1'b1;
_decim_rate = _decim_rate >> 1;
end
// CIC rate cannot be set to 0
cic_rate = (_decim_rate[7:0] == 8'd0) ? 8'd1 : _decim_rate[7:0];
`ASSERT_ERROR(
hb_enables <= NUM_HB,
"Enabled halfbands may not exceed total number of half bands."
);
`ASSERT_ERROR(
cic_rate > 0 && cic_rate <= CIC_MAX_DECIM,
"CIC Decimation rate must be positive, not exceed the max cic decimation rate, and cannot equal 0!"
);
// Setup DDC
$display("Set decimation to %0d", decim_rate);
$display("- Number of enabled HBs: %0d", hb_enables);
$display("- CIC Rate: %0d", cic_rate);
write_reg(port, SR_N_ADDR, decim_rate); // Set decimation rate in AXI rate change
write_reg(port, SR_DECIM_ADDR, {hb_enables,cic_rate}); // Enable HBs, set CIC rate
endtask
task automatic send_ramp (
input int unsigned port,
input int unsigned decim_rate,
// (Optional) For testing passing through partial packets
input logic drop_partial_packet = 1'b0,
input int unsigned extra_samples = 0
);
set_decim_rate(port, decim_rate);
// Setup DDC
write_reg(port, SR_CONFIG_ADDR, 32'd1); // Enable clear EOB
write_reg(port, SR_FREQ_ADDR, 32'd0); // Phase increment
write_reg(port, SR_SCALE_IQ_ADDR, (1 << 14)); // Scaling, set to 1
// Send a short ramp, should pass through unchanged
fork
begin
chdr_word_t send_payload[$];
packet_info_t pkt_info;
pkt_info = 0;
for (int i = 0; i < decim_rate*(PKT_SIZE_BYTES/8 + extra_samples); i++) begin
send_payload.push_back({16'(2*i/decim_rate), 16'(2*i/decim_rate), 16'((2*i+1)/decim_rate), 16'((2*i+1)/decim_rate)});
end
$display("Send ramp (%0d words)", send_payload.size());
pkt_info.eob = 1;
blk_ctrl.send_packets(port, send_payload, /*data_bytes*/, /*metadata*/, pkt_info);
blk_ctrl.wait_complete(port);
$display("Send ramp complete");
end
begin
string s;
logic [63:0] samples, samples_old;
chdr_word_t recv_payload[$], temp_payload[$];
chdr_word_t metadata[$];
int data_bytes;
packet_info_t pkt_info;
$display("Check ramp");
if (~drop_partial_packet && (extra_samples > 0)) begin
blk_ctrl.recv_adv(port, temp_payload, data_bytes, metadata, pkt_info);
$sformat(s, "Invalid EOB state! Expected %b, Received: %b", 1'b0, pkt_info.eob);
`ASSERT_ERROR(pkt_info.eob == 1'b0, s);
end
$display("Receiving packet");
blk_ctrl.recv_adv(port, recv_payload, data_bytes, metadata, pkt_info);
$display("Received!");
$sformat(s, "Invalid EOB state! Expected %b, Received: %b", 1'b1, pkt_info.eob);
`ASSERT_ERROR(pkt_info.eob == 1'b1, s);
recv_payload = {temp_payload, recv_payload};
if (drop_partial_packet) begin
$sformat(s, "Incorrect packet size! Expected: %0d, Actual: %0d", PKT_SIZE_BYTES/8, recv_payload.size());
`ASSERT_ERROR(recv_payload.size() == PKT_SIZE_BYTES/8, s);
end else begin
$sformat(s, "Incorrect packet size! Expected: %0d, Actual: %0d", PKT_SIZE_BYTES/8, recv_payload.size() + extra_samples);
`ASSERT_ERROR(recv_payload.size() == PKT_SIZE_BYTES/8 + extra_samples, s);
end
samples = 64'd0;
samples_old = 64'd0;
for (int i = 0; i < PKT_SIZE_BYTES/8; i++) begin
samples = recv_payload[i];
for (int j = 0; j < 4; j++) begin
// Need to check a range of values due to imperfect gain compensation
$sformat(s, "Ramp word %0d invalid! Expected: %0d-%0d, Received: %0d", 2*i,
samples_old[16*j +: 16], samples_old[16*j +: 16]+16'd4, samples[16*j +: 16]);
`ASSERT_ERROR((samples_old[16*j +: 16]+16'd4 >= samples[16*j +: 16]) && (samples >= samples_old[16*j +: 16]), s);
end
samples_old = samples;
end
$display("Check complete");
end
join
endtask
//---------------------------------------------------------------------------
// Test Process
//---------------------------------------------------------------------------
initial begin : tb_main
const int port = 0;
test.start_tb("rfnoc_block_ddc_tb");
// Start the BFMs running
blk_ctrl.run();
//-------------------------------------------------------------------------
// Reset
//-------------------------------------------------------------------------
test.start_test("Wait for Reset", 10us);
fork
blk_ctrl.reset_chdr();
blk_ctrl.reset_ctrl();
join;
test.end_test();
//-------------------------------------------------------------------------
// Check NoC ID and Block Info
//-------------------------------------------------------------------------
test.start_test("Verify Block Info", 2us);
`ASSERT_ERROR(blk_ctrl.get_noc_id() == NOC_ID, "Incorrect NOC_ID Value");
`ASSERT_ERROR(blk_ctrl.get_num_data_i() == NUM_PORTS, "Incorrect NUM_DATA_I Value");
`ASSERT_ERROR(blk_ctrl.get_num_data_o() == NUM_PORTS, "Incorrect NUM_DATA_O Value");
`ASSERT_ERROR(blk_ctrl.get_mtu() == MTU, "Incorrect MTU Value");
test.end_test();
//-------------------------------------------------------------------------
// Test read-back regs
//-------------------------------------------------------------------------
begin
logic [63:0] val64;
test.start_test("Test registers", 10us);
read_user_reg(port, RB_NUM_HB, val64);
`ASSERT_ERROR(val64 == NUM_HB, "Register NUM_HB didn't read back expected value");
read_user_reg(port, RB_CIC_MAX_DECIM, val64);
`ASSERT_ERROR(val64 == CIC_MAX_DECIM, "Register CIC_MAX_DECIM didn't read back expected value");
test.end_test();
end
//-------------------------------------------------------------------------
// Test various decimation rates
//-------------------------------------------------------------------------
begin
test.start_test("Decimate by 1, 2, 3, 4, 6, 8, 12, 13, 16, 24, 40, 255, 2040", 0.5ms);
$display("Note: This test will take a long time!");
// List of rates to catch most issues
send_ramp(port, 1); // HBs enabled: 0, CIC rate: 1
send_ramp(port, 2); // HBs enabled: 1, CIC rate: 1
send_ramp(port, 3); // HBs enabled: 0, CIC rate: 3
send_ramp(port, 4); // HBs enabled: 2, CIC rate: 1
if (EXTENDED_TEST) send_ramp(port, 6); // HBs enabled: 1, CIC rate: 3
send_ramp(port, 8); // HBs enabled: 3, CIC rate: 1
send_ramp(port, 12); // HBs enabled: 2, CIC rate: 3
send_ramp(port, 13); // HBs enabled: 0, CIC rate: 13
if (EXTENDED_TEST) send_ramp(port, 16); // HBs enabled: 3, CIC rate: 2
if (EXTENDED_TEST) send_ramp(port, 24); // HBs enabled: 3, CIC rate: 3
send_ramp(port, 40); // HBs enabled: 3, CIC rate: 5
if (EXTENDED_TEST) send_ramp(port, 200); // HBs enabled: 3, CIC rate: 25
send_ramp(port, 255); // HBs enabled: 0, CIC rate: 255
if (EXTENDED_TEST) send_ramp(port, 2040); // HBs enabled: 3, CIC rate: 255
test.end_test();
end
//-------------------------------------------------------------------------
// Test timed tune
//-------------------------------------------------------------------------
// This test has not been implemented because the RFNoC FFT has not been
// ported yet.
//-------------------------------------------------------------------------
// Test passing through a partial packet
//-------------------------------------------------------------------------
test.start_test("Pass through partial packet");
send_ramp(port, 2, 0, 4);
send_ramp(port, 3, 0, 4);
send_ramp(port, 4, 0, 4);
if (EXTENDED_TEST) send_ramp(port, 8, 0, 4);
send_ramp(port, 13, 0, 4);
if (EXTENDED_TEST) send_ramp(port, 24, 0, 4);
test.end_test();
//-------------------------------------------------------------------------
// Finish
//-------------------------------------------------------------------------
// End the TB, but don't $finish, since we don't want to kill other
// instances of this testbench that may be running.
test.end_tb(0);
// Kill the clocks to end this instance of the testbench
rfnoc_chdr_clk_gen.kill();
rfnoc_ctrl_clk_gen.kill();
ddc_clk_gen.kill();
end
endmodule