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Diffstat (limited to 'src/tb/tb_fmc_arbiter.v')
| -rw-r--r-- | src/tb/tb_fmc_arbiter.v | 286 |
1 files changed, 286 insertions, 0 deletions
diff --git a/src/tb/tb_fmc_arbiter.v b/src/tb/tb_fmc_arbiter.v new file mode 100644 index 0000000..a0e780b --- /dev/null +++ b/src/tb/tb_fmc_arbiter.v @@ -0,0 +1,286 @@ +//====================================================================== +// +// tb_fmc_arbiter.v +// ------------- +// Test bench for FMC Arbiter module, read and write transactions +// from STM32 are simulated in this file. +// +// Author: Pavel Shatov +// Copyright (c) 2015, NORDUnet A/S All rights reserved. +// +// 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. +// +//====================================================================== +
+module tb_fmc_arbiter;
+
+
+ //
+ // FMC Side
+ //
+ reg fmc_clk;
+ reg [21: 0] fmc_a;
+ wire [31: 0] fmc_d;
+ reg [31: 0] fmc_d_reg;
+ reg fmc_d_drive;
+ reg fmc_ne1;
+ reg fmc_nl;
+ reg fmc_nwe;
+ reg fmc_noe;
+ wire fmc_nwait;
+
+
+ //
+ // Data Bus
+ //
+ assign fmc_d = fmc_d_drive ? fmc_d_reg : {32{1'bZ}};
+
+
+ //
+ // System Side
+ //
+ reg sys_clk = 1'b0;
+ wire [21: 0] sys_addr;
+ wire sys_wr_en;
+ reg [31: 0] sys_data_in = 32'hCA53CA53;
+ wire sys_rd_en;
+ wire [31: 0] sys_data_out;
+
+
+ reg [31: 0] test_reg;
+ always @(posedge sys_clk)
+ //
+ if (sys_wr_en) begin
+ //
+ test_reg <= (sys_addr == {22{1'b0}}) ? sys_data_out : {{10{1'b0}}, sys_addr};
+ //
+ end else if (sys_rd_en) begin
+ //
+ sys_data_in <= test_reg;
+ //
+ end
+
+
+ //
+ // UUT
+ //
+ fmc_arbiter #
+ (
+ .NUM_ADDR_BITS(22)
+ )
+ uut
+ (
+ .fmc_clk (fmc_clk),
+ .fmc_a (fmc_a),
+ .fmc_d (fmc_d),
+ .fmc_ne1 (fmc_ne1),
+ .fmc_nl (fmc_nl),
+ .fmc_nwe (fmc_nwe),
+ .fmc_noe (fmc_noe),
+ .fmc_nwait (fmc_nwait),
+
+ .sys_clk (sys_clk),
+ .sys_addr (sys_addr),
+ .sys_wr_en (sys_wr_en),
+ .sys_data_out (sys_data_out),
+ .sys_rd_en (sys_rd_en),
+ .sys_data_in (sys_data_in)
+ );
+
+
+ //
+ // System Clock (50 MHz)
+ //
+ always #10 sys_clk = ~sys_clk;
+
+
+ //
+ // FMC Clock (100 MHz)
+ //
+ always #5.5 fmc_clk = ~fmc_clk;
+
+
+ //
+ // Initial FMC State
+ //
+ initial begin
+ fmc_clk = 1'b0;
+ fmc_a = {22{1'bX}};
+ fmc_d_reg = {32{1'bX}};
+ fmc_d_drive = 1'b0;
+ fmc_ne1 = 1'b1;
+ fmc_nl = 1'b1;
+ fmc_nwe = 1'b1;
+ fmc_noe = 1'b1;
+ end
+
+
+ //
+ // Script
+ //
+ reg [31: 0] rd;
+ initial begin
+ //
+ #500;
+ //
+ fmc_write(22'h3ABCDE, 32'hFEDCBA98);
+ while (fmc_nwait == 1'b0) #0.1;
+ //
+ #1000;
+ //
+ fmc_read(22'h3ABCDE, rd);
+ while (fmc_nwait == 1'b0) #0.1;
+ fmc_read(22'h3ABCDE, rd);
+ //
+ #1000;
+ //
+ end
+
+
+
+ // + // Write Transaction + // + integer tick; + task fmc_write; + input [21: 0] addr; + input [31: 0] data; + begin
+ //
+ fmc_wait_posedge;
+ fmc_wait_negedge;
+ //
+ fmc_ne1 = 1'b0; // select device
+ fmc_nwe = 1'b0; // transaction type is write
+ fmc_nl = 1'b0; // address is valid
+ fmc_a = addr; // set address
+ //
+ fmc_wait_posedge;
+ fmc_wait_negedge;
+ //
+ fmc_nl = 1'b1; // address is no longer valid
+ //
+ for (tick=0; tick<2; tick=tick+1) begin
+ fmc_wait_posedge;
+ fmc_wait_negedge;
+ end
+ //
+ fmc_d_reg = data; // set data
+ fmc_d_drive = 1'b1; // enable driver
+ //
+ fmc_wait_posedge;
+ fmc_wait_negedge;
+ //
+ fmc_ne1 = 1'b1; // deselect device
+ fmc_nwe = 1'b1; // clear
+ fmc_d_drive = 1'b0; // disable driver
+ // + end + endtask;
+
+
+ // + // Read Transaction + // + task fmc_read; + input [21: 0] addr; + output [31: 0] data; + begin
+ //
+ fmc_wait_posedge;
+ fmc_wait_negedge;
+ //
+ fmc_ne1 = 1'b0; // select device
+ fmc_nl = 1'b0; // address is valid
+ fmc_a = addr; // set address
+ //
+ fmc_wait_posedge;
+ fmc_wait_negedge;
+ //
+ fmc_nl = 1'b1; // address is no longer valid
+ //
+ for (tick=0; tick<2; tick=tick+1) begin
+ fmc_wait_posedge;
+ fmc_wait_negedge;
+ end
+ //
+ fmc_noe = 1'b0; // reverse bus direction
+ fmc_wait_posedge;
+ data = fmc_d;
+ fmc_wait_negedge;
+ //
+ fmc_ne1 = 1'b1; // deselect device
+ fmc_noe = 1'b1; // reverse bus direction
+ //
+ /*
+ fmc_ne1 = 1'b0;
+ fmc_nl = 1'b0;
+ fmc_a = addr;
+ #5 fmc_clk = 1'b1;
+ #5 fmc_nl = 1'b1;
+ fmc_clk = 1'b0;
+ #5 fmc_clk = 1'b1;
+ #5 fmc_clk = 1'b0;
+ fmc_noe = 1'b0;
+ #5 fmc_clk = 1'b1;
+ #5 fmc_clk = 1'b0;
+ #5
+ while (fmc_nwait == 1'b0) begin + fmc_clk = 1'b1; + #5 fmc_clk = 1'b0;
+ #5; + end
+ data = fmc_d;
+ fmc_clk = 1'b1; + #5 fmc_clk = 1'b0;
+ #5 fmc_ne1 = 1'b1;
+ fmc_noe = 1'b1; + #10;
+ */ + end + endtask;
+
+
+ task fmc_wait_posedge;
+ begin
+ while (fmc_clk != 1'b1) #0.1;
+ #0.1;
+ end
+ endtask;
+
+ task fmc_wait_negedge;
+ begin
+ while (fmc_clk != 1'b0) #0.1;
+ #0.1;
+ end
+ endtask;
+
+endmodule
+
+//====================================================================== +// EOF tb_fmc_arbiter.v +//====================================================================== |