diff options
Diffstat (limited to 'fpga/usrp2/sdr_lib/hb_tb.v')
| -rw-r--r-- | fpga/usrp2/sdr_lib/hb_tb.v | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/fpga/usrp2/sdr_lib/hb_tb.v b/fpga/usrp2/sdr_lib/hb_tb.v new file mode 100644 index 000000000..3260ac738 --- /dev/null +++ b/fpga/usrp2/sdr_lib/hb_tb.v @@ -0,0 +1,172 @@ +// +// Copyright 2011 Ettus Research LLC +// +// This program is free software: you can redistribute it and/or modify +// it under the terms of the GNU General Public License as published by +// the Free Software Foundation, either version 3 of the License, or +// (at your option) any later version. +// +// This program is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this program. If not, see <http://www.gnu.org/licenses/>. +// + + +module hb_tb(); + + localparam SWIDTH = 17; + localparam CWIDTH = 18; + localparam TWIDTH = 20; + localparam ACC_WIDTH = 40; + + reg clk = 0, rst = 1; + wire strobe_in, strobe_out; + reg [SWIDTH-1:0] sample_in; + wire signed [SWIDTH:0] sample_out; + + reg set_stb; + reg [7:0] set_addr; + reg [31:0] set_data; + + localparam DECIM = 3; + + initial $dumpfile("hb_tb.vcd"); + initial $dumpvars(0,hb_tb); + + always #5 clk <= ~clk; + initial + begin + @(posedge clk); + @(negedge clk); + rst <= 0; + end + + reg [7:0] stb_counter; + always @(posedge clk) + if(rst) + stb_counter <= 0; + else + if(stb_counter == 0) + stb_counter <= DECIM; + else + stb_counter <= stb_counter - 1; + assign strobe_in = (stb_counter == 0); + + hb_decim #(.SWIDTH(SWIDTH),.CWIDTH(CWIDTH), + .TWIDTH(TWIDTH),.ACC_WIDTH(ACC_WIDTH)) hb_decim + (.clk(clk), .rst(rst), + .set_stb(set_stb), .set_addr(set_addr), .set_data(set_data), + .sample_in(sample_in), + .strobe_in(strobe_in), + .sample_out(sample_out), + .strobe_out(strobe_out) + ); + + initial + begin : load_coeffs + @(negedge rst); + @(posedge clk); + set_addr <= 124; // load coeffs + set_stb <= 1; + set_data <= -18'd49; + @(posedge clk); + set_data <= 18'd165; + @(posedge clk); + set_data <= -18'd412; + @(posedge clk); + set_data <= 18'd873; + @(posedge clk); + set_data <= -18'd1681; + @(posedge clk); + set_data <= 18'd3135; + @(posedge clk); + set_data <= -18'd6282; + @(posedge clk); + set_data <= 18'd20628; + @(posedge clk); + set_addr <=125; // load table + // { stb_out, accum, load_accum, done, even_addr, odd_addr_a, odd_addr_b, coeff_addr } + set_data <= {1'b1,1'b1,1'b0,1'b1,4'd15,4'd15,4'd0,4'd0}; // Phase 8 + @(posedge clk); + set_data <= {1'b0,1'b1,1'b0,1'b0,4'd15,4'd14,4'd1,4'd1}; // Phase 7 + @(posedge clk); + set_data <= {1'b0,1'b1,1'b0,1'b0,4'd15,4'd13,4'd2,4'd2}; // Phase 6 + @(posedge clk); + set_data <= {1'b0,1'b1,1'b0,1'b0,4'd15,4'd12,4'd3,4'd3}; // Phase 5 + @(posedge clk); + set_data <= {1'b0,1'b1,1'b0,1'b0,4'd15,4'd11,4'd4,4'd4}; // Phase 4 + @(posedge clk); + set_data <= {1'b0,1'b1,1'b0,1'b0,4'd15,4'd10,4'd5,4'd5}; // Phase 3 + @(posedge clk); + set_data <= {1'b0,1'b1,1'b0,1'b0,4'd15,4'd9,4'd6,4'd6}; // Phase 2 + @(posedge clk); + set_data <= {1'b0,1'b0,1'b1,1'b0,4'd15,4'd8,4'd7,4'd7}; // Phase 1 + @(posedge clk); + set_data <= {1'b0,1'b0,1'b0,1'b0,4'd15,4'd8,4'd7,4'd7}; // Phase 0 + @(posedge clk); + set_stb <= 0; + end // block: load_coeffs + + initial + begin + sample_in <= 0; + repeat(40) + @(posedge strobe_in); + $display("EVEN"); + sample_in <= 0; + repeat(10) + @(posedge strobe_in); + sample_in <= 1; + @(posedge strobe_in); + sample_in <= 0; + repeat(40) + @(posedge strobe_in); + sample_in <= 1; + repeat(40) + @(posedge strobe_in); + sample_in <= 0; + repeat(60) + @(posedge strobe_in); + sample_in <= 1; + repeat(2) + @(posedge strobe_in); + sample_in <= 0; + repeat(60) + @(posedge strobe_in); + $display("ODD"); + sample_in <= 0; + repeat(10) + @(posedge strobe_in); + sample_in <= 1; + @(posedge strobe_in); + sample_in <= 0; + repeat(40) + @(posedge strobe_in); + sample_in <= 1; + repeat(40) + @(posedge strobe_in); + sample_in <= 0; + repeat(60) + @(posedge strobe_in); + sample_in <= 1; + repeat(2) + @(posedge strobe_in); + sample_in <= 0; + repeat(60) + @(posedge strobe_in); + $finish; + end + + always @(posedge clk) + if(strobe_in) + $display(sample_in); + + always @(posedge clk) + if(strobe_out) + $display("\t",sample_out); + +endmodule // hb_tb |