From 0d440394746183c2ed2f39c7665cbf7b67a1764a Mon Sep 17 00:00:00 2001 From: jcorgan Date: Wed, 22 Apr 2009 00:11:28 +0000 Subject: Merged r10770:10887 from jcorgan/iad2 into trunk. Adds alternative USRP2 FPGA build to use integrate-and-dump decimator instead of CIC/HB combination. This provides a much shorter time duration impulse response for the same decimation rate, at the expense of worse stop-band rejection. git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10888 221aa14e-8319-0410-a670-987f0aec2ac5 --- top/u2_rev3_iad/integrate.v | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 top/u2_rev3_iad/integrate.v (limited to 'top/u2_rev3_iad/integrate.v') diff --git a/top/u2_rev3_iad/integrate.v b/top/u2_rev3_iad/integrate.v new file mode 100644 index 000000000..db33de979 --- /dev/null +++ b/top/u2_rev3_iad/integrate.v @@ -0,0 +1,38 @@ +module integrate + #(parameter INPUTW = 16, + parameter ACCUMW = 32, + parameter OUTPUTW = 16) + + (input clk_i, + input rst_i, + input ena_i, + + input dump_i, + input [INPUTW-1:0] data_i, + + output reg stb_o, + output reg [OUTPUTW-1:0] integ_o + ); + + wire [ACCUMW-1:0] data_ext = {{ACCUMW-INPUTW{data_i[INPUTW-1]}},data_i}; + reg [ACCUMW-1:0] accum; + + always @(posedge clk_i) + if (rst_i | ~ena_i) + begin + accum <= 0; + integ_o <= 0; + end + else + if (dump_i) + begin + integ_o <= accum[ACCUMW-1:ACCUMW-OUTPUTW]; + accum <= data_ext; + end + else + accum <= accum + data_ext; + + always @(posedge clk_i) + stb_o <= dump_i; + +endmodule // integrate -- cgit v1.2.3