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| author | jcorgan | 2007-06-05 04:21:29 +0000 |
|---|---|---|
| committer | jcorgan | 2007-06-05 04:21:29 +0000 |
| commit | e283fe844c88aa33b6bde4a7cb74f0d1c2ddbbc5 (patch) | |
| tree | 0081a8487d3a4bb7a65404c2662d0a7480f50421 /gr-sounder/src/fpga/lib/lfsr_constants.v | |
| parent | 389906ea28957c6d7a08b5cd43a4ac2ab0c9d24d (diff) | |
| download | gnuradio-e283fe844c88aa33b6bde4a7cb74f0d1c2ddbbc5.tar.gz gnuradio-e283fe844c88aa33b6bde4a7cb74f0d1c2ddbbc5.tar.bz2 gnuradio-e283fe844c88aa33b6bde4a7cb74f0d1c2ddbbc5.zip | |
Merged r5566:5676 from jcorgan/snd into trunk, with minor changes. Component gr-sounder is now complete for recording impulse responses to a file.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@5679 221aa14e-8319-0410-a670-987f0aec2ac5
Diffstat (limited to 'gr-sounder/src/fpga/lib/lfsr_constants.v')
| -rw-r--r--[-rwxr-xr-x] | gr-sounder/src/fpga/lib/lfsr_constants.v | 66 |
1 files changed, 39 insertions, 27 deletions
diff --git a/gr-sounder/src/fpga/lib/lfsr_constants.v b/gr-sounder/src/fpga/lib/lfsr_constants.v index 55ee613d2..e23ed6601 100755..100644 --- a/gr-sounder/src/fpga/lib/lfsr_constants.v +++ b/gr-sounder/src/fpga/lib/lfsr_constants.v @@ -19,33 +19,45 @@ // Foundation, Inc., 51 Franklin Street, Boston, MA 02110-1301 USA // -module lfsr_constants(degree_i,mask_o,len_o); - input wire [4:0] degree_i; - output reg [15:0] mask_o; - output wire [15:0] len_o; - - assign len_o = (1 << degree_i) - 1; +module lfsr_constants(clk_i,rst_i,degree_i,mask_o,len_o); + input clk_i; + input rst_i; + input [4:0] degree_i; + output reg [15:0] mask_o; + output reg [16:0] len_o; + + integer len; - always @* - case (degree_i) - 5'd00: mask_o = 16'h0000; - 5'd01: mask_o = 16'h0001; - 5'd02: mask_o = 16'h0003; - 5'd03: mask_o = 16'h0005; - 5'd04: mask_o = 16'h0009; - 5'd05: mask_o = 16'h0012; - 5'd06: mask_o = 16'h0021; - 5'd07: mask_o = 16'h0041; - 5'd08: mask_o = 16'h008E; - 5'd09: mask_o = 16'h0108; - 5'd10: mask_o = 16'h0204; - 5'd11: mask_o = 16'h0402; - 5'd12: mask_o = 16'h0829; - 5'd13: mask_o = 16'h100D; - 5'd14: mask_o = 16'h2015; - 5'd15: mask_o = 16'h4001; - 5'd16: mask_o = 16'h8016; - default: mask_o = 16'h0000; - endcase // case(degree_i) + always @(posedge clk_i) + if (rst_i) + begin + len_o <= #5 17'b0; + mask_o <= #5 16'b0; + end + else + begin + len_o <= #5 ((1 << degree_i) << 1)-3; + + case (degree_i) + 5'd00: mask_o <= #5 16'h0000; + 5'd01: mask_o <= #5 16'h0001; + 5'd02: mask_o <= #5 16'h0003; + 5'd03: mask_o <= #5 16'h0005; + 5'd04: mask_o <= #5 16'h0009; + 5'd05: mask_o <= #5 16'h0012; + 5'd06: mask_o <= #5 16'h0021; + 5'd07: mask_o <= #5 16'h0041; + 5'd08: mask_o <= #5 16'h008E; + 5'd09: mask_o <= #5 16'h0108; + 5'd10: mask_o <= #5 16'h0204; + 5'd11: mask_o <= #5 16'h0402; + 5'd12: mask_o <= #5 16'h0829; + 5'd13: mask_o <= #5 16'h100D; + 5'd14: mask_o <= #5 16'h2015; + 5'd15: mask_o <= #5 16'h4001; + 5'd16: mask_o <= #5 16'h8016; + default: mask_o <= #5 16'h0000; + endcase // case(degree_i) + end // else: !if(rst_i) endmodule // lfsr_constants |