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-rw-r--r--src/tb/tb_fmc_core_selector.v367
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+//------------------------------------------------------------------------------
+//
+// tb_fmc_core_selector.v
+// -----------------------------------------------------------------------------
+// Testbench for fixed latency FMC arbiter.
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2018-2019, NORDUnet A/S
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// - Redistributions of source code must retain the above copyright notice,
+// this list of conditions and the following disclaimer.
+//
+// - Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may be
+// used to endorse or promote products derived from this software without
+// specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+`timescale 1ns / 1ps
+//------------------------------------------------------------------------------
+
+module tb_fmc_core_selector;
+
+
+ //
+ // Settings
+ //
+ localparam integer NUM_TESTS = 100;
+
+
+ //
+ // STM32 Settings
+ //
+ localparam integer STM32_FMC_LATENCY = 6;
+
+
+ //
+ // Clock
+ //
+
+ /* actual hardware uses 45 MHz, we use 50 for convenience */
+
+ localparam FMC_CLOCK_PERIOD = 20.0;
+ localparam FMC_CLOCK_PERIOD_HALF = 0.5 * FMC_CLOCK_PERIOD;
+ localparam FMC_CLOCK_PERIOD_QUARTER = 0.5 * FMC_CLOCK_PERIOD_HALF;
+
+ reg fmc_clk = 1'b0;
+
+ initial forever #FMC_CLOCK_PERIOD_HALF fmc_clk = ~fmc_clk;
+
+
+ //
+ // Clock Manager
+ //
+ wire io_clk;
+ wire sys_clk;
+ wire sys_rst_n;
+ wire core_clk;
+
+ alpha_clkmgr clkmgr_inst
+ (
+ .fmc_clk (fmc_clk),
+
+ .io_clk (io_clk),
+ .sys_clk (sys_clk),
+ .sys_rst_n (sys_rst_n),
+ .core_clk (core_clk)
+ );
+
+
+ //
+ // FMC Arbiter - FPGA Side
+ //
+ wire [23: 0] sys_fmc_addr;
+ wire sys_fmc_wren;
+ wire sys_fmc_rden;
+ wire [31: 0] sys_fmc_dout;
+ wire [31: 0] sys_fmc_din;
+
+
+ //
+ // FMC Arbiter - STM32 Side
+ //
+ reg [23: 0] fmc_a = {24{1'bX}};
+ reg [31: 0] fmc_d_drive;
+ wire [31: 0] fmc_d_bidir;
+ reg fmc_ne1 = 1'b1;
+ reg fmc_noe = 1'b1;
+ reg fmc_nwe = 1'b1;
+ reg fmc_nl = 1'b1;
+ wire fmc_nwait_dummy;
+
+ assign fmc_d_bidir = fmc_noe ? fmc_d_drive : 32'hZZZZZZZZ;
+
+ fmc_arbiter #(.NUM_ADDR_BITS(24))
+ uut
+ (
+ // fmc bus
+ .fmc_a (fmc_a),
+ .fmc_d (fmc_d_bidir),
+ .fmc_ne1 (fmc_ne1),
+ .fmc_nl (fmc_nl),
+ .fmc_nwe (fmc_nwe),
+ .fmc_noe (fmc_noe),
+ .fmc_nwait (fmc_nwait_dummy),
+
+ // system clock, i/o clock
+ .io_clk (io_clk),
+ .sys_clk (sys_clk),
+
+ // user bus
+ .sys_addr (sys_fmc_addr),
+ .sys_wr_en (sys_fmc_wren),
+ .sys_data_out (sys_fmc_dout),
+ .sys_rd_en (sys_fmc_rden),
+ .sys_data_in (sys_fmc_din)
+ );
+
+
+ //
+ // Core Selector
+ //
+ core_selector core_selector_inst
+ (
+ .sys_clk (sys_clk),
+ .sys_rst_n (sys_rst_n),
+
+ .sys_fmc_addr (sys_fmc_addr),
+ .sys_fmc_wr (sys_fmc_wren),
+ .sys_fmc_rd (sys_fmc_rden),
+ .sys_read_data (sys_fmc_din),
+ .sys_write_data (sys_fmc_dout),
+ .sys_error (),
+
+ .mkm_sclk (),
+ .mkm_cs_n (),
+ .mkm_do (1'bZ),
+ .mkm_di (),
+
+ .core_clk (core_clk),
+
+ .noise (1'bZ),
+ .debug ()
+ );
+
+
+ //
+ // "Random" Number Generator
+ //
+ reg [7:0] lfsr8;
+
+ task lfsr8_next;
+ lfsr8 = {lfsr8[6:0], lfsr8[8-1] ^ lfsr8[6-1] ^ lfsr8[5-1] ^ lfsr8[4-1]};
+ endtask
+
+ task lfsr8_seed;
+ input [7:0] lfsr8_in;
+ lfsr8 = lfsr8_in;
+ endtask
+
+
+ //
+ // Helper Tasks
+ //
+
+ //----------------------
+ task wait_quarter_tick;
+ //----------------------
+ #FMC_CLOCK_PERIOD_QUARTER;
+ endtask
+
+ //------------------
+ task wait_half_tick;
+ //------------------
+ begin
+ wait_quarter_tick;
+ wait_quarter_tick;
+ end
+ endtask
+
+ //------------------
+ task wait_full_tick;
+ //------------------
+ begin
+ wait_half_tick;
+ wait_half_tick;
+ end
+ endtask
+
+ //----------------
+ task wait_n_ticks;
+ //----------------
+ input integer n;
+ integer i;
+ for (i=0; i<n; i=i+1)
+ wait_full_tick;
+ endtask
+
+ //-------------
+ task fmc_write;
+ //-------------
+ input [15: 0] core;
+ input [ 7: 0] offset;
+ input [31: 0] data;
+ begin
+ fmc_ne1 = 1'b0; // select
+ fmc_nl = 1'b0; // set latch flag
+ fmc_a = {core, offset}; // set address
+ fmc_nwe = 1'b0; // set write-enable
+ wait_full_tick(); // mimic latency
+
+ fmc_nl = 1'b1; // clear latch flag
+ fmc_a = {24{1'bX}}; // clear address
+ wait_n_ticks(STM32_FMC_LATENCY); // mimic latency
+
+ fmc_d_drive = data; // set data
+
+ wait_half_tick(); // mimic latency
+ wait_quarter_tick();
+
+ fmc_ne1 = 1'b1; // deselect
+ fmc_nwe = 1'b1; // clear write-enable
+ fmc_d_drive = 32'hXXXXXXXX; // clear data
+
+ wait_quarter_tick(); // finish clock period
+ wait_full_tick(); // pause
+ end
+ endtask
+
+ //------------
+ task fmc_read;
+ //------------
+ input [15: 0] core;
+ input [ 7: 0] offset;
+ output [31: 0] data;
+ begin
+ fmc_ne1 = 1'b0; // select
+ fmc_nl = 1'b0; // set latch flag
+ fmc_a = {core, offset}; // set address
+
+ wait_full_tick(); // mimic latency
+
+ fmc_nl = 1'b1; // clear latch flag
+ fmc_a = {24{1'bX}}; // clear address
+ wait_full_tick(); // mimic latency
+ fmc_noe = 1'b0; // tri-state bus
+ wait_n_ticks(STM32_FMC_LATENCY-1); // mimic latency
+
+ wait_half_tick(); // mimic latency
+ data = fmc_d_bidir; // sample data
+ wait_half_tick(); // mimic latency
+
+ wait_full_tick(); // mimic latency
+
+ wait_half_tick(); // mimic latency
+ wait_quarter_tick();
+
+ fmc_ne1 = 1'b1; // deselect
+ fmc_noe = 1'b1; // drive bus
+
+ wait_quarter_tick(); // finish clock period
+ wait_full_tick(); // pause
+ end
+ endtask
+
+ //----------------
+ task gen_rnd_addr;
+ //----------------
+ output [31:0] addr;
+ reg [7:0] a, b, c;
+ begin
+ lfsr8_next; a = lfsr8;
+ lfsr8_next; b = lfsr8;
+ lfsr8_next; c = lfsr8;
+ addr = {a, b, c};
+ end
+ endtask
+
+ //----------------
+ task gen_rnd_data;
+ //----------------
+ output [31:0] data;
+ reg [7:0] a, b, c, d;
+ begin
+ lfsr8_next; a = lfsr8;
+ lfsr8_next; b = lfsr8;
+ lfsr8_next; c = lfsr8;
+ lfsr8_next; d = lfsr8;
+ data = {a, b, c, d};
+ end
+ endtask
+
+
+ //
+ // Script
+ //
+ reg [23:0] addr;
+ reg [31:0] data_wr;
+ reg [31:0] data_rd;
+ integer i;
+ initial begin
+
+ // let all signals initialize
+ wait_full_tick;
+
+ // wait for reset to complete
+ while (!sys_rst_n) begin
+ wait_full_tick;
+ end
+
+ // wait some more time
+ wait_n_ticks(100);
+
+ // do tests
+ lfsr8_seed(8'hA5);
+ for (i=0; i<NUM_TESTS; i=i+1) begin
+ gen_rnd_data(data_wr);
+ fmc_write(16'h0000, 8'd255, data_wr);
+ fmc_read(16'h0000, 8'd255, data_rd);
+ $display("Read %04d/%04d: 0x%x | 0x%x", i+1, NUM_TESTS, data_rd, data_wr);
+ if (data_rd !== data_wr) begin
+ $display("ERROR");
+ $finish;
+ end
+ gen_rnd_data(data_wr);
+ fmc_write(16'h0037, 8'd15, data_wr);
+ fmc_read(16'h0037, 8'd15, data_rd);
+ $display(" 0x%x | 0x%x", data_rd, data_wr);
+ if (data_rd !== data_wr) begin
+ $display("ERROR");
+ $finish;
+ end
+ end
+
+ $display("All tests passed. [OK]");
+ $finish;
+
+ end
+
+
+endmodule
+
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------