diff options
Diffstat (limited to 'sdr_lib/cic_decim.v')
| -rwxr-xr-x | sdr_lib/cic_decim.v | 23 |
1 files changed, 3 insertions, 20 deletions
diff --git a/sdr_lib/cic_decim.v b/sdr_lib/cic_decim.v index d7e5310b8..6c20416f1 100755 --- a/sdr_lib/cic_decim.v +++ b/sdr_lib/cic_decim.v @@ -24,7 +24,7 @@ module cic_decim ( clock,reset,enable,rate,strobe_in,strobe_out,signal_in,signal_out); parameter bw = 16; parameter N = 4; - parameter log2_of_max_rate = 8; + parameter log2_of_max_rate = 7; parameter maxbitgain = N * log2_of_max_rate; input clock; @@ -82,25 +82,8 @@ module cic_decim wire [bw+maxbitgain-1:0] signal_out_unnorm = pipeline[N-1]; - // Output Scaling to same width as input - function [2:0] log_ceil; - input [7:0] val; - log_ceil = val[6] ? 3'd7 : val[5] ? 3'd6 : val[4] ? 3'd5 : - val[3] ? 3'd4 : val[2] ? 3'd3 : val[1] ? 3'd2 : 3'd1; - endfunction // log_ceil - - wire [2:0] shift = log_ceil(rate); - - always @* - case(shift) - 3'd2 : signal_out = signal_out_unnorm[2*N+bw-1:2*N]; // Decim by 4 - 3'd3 : signal_out = signal_out_unnorm[3*N+bw-1:3*N]; - 3'd4 : signal_out = signal_out_unnorm[4*N+bw-1:4*N]; - 3'd5 : signal_out = signal_out_unnorm[5*N+bw-1:5*N]; - 3'd6 : signal_out = signal_out_unnorm[6*N+bw-1:6*N]; - 3'd7 : signal_out = signal_out_unnorm[7*N+bw-1:7*N]; - default : signal_out = signal_out_unnorm[7*N+bw-1:7*N]; - endcase // case(shift) + cic_dec_shifter #(bw) + cic_dec_shifter(rate,signal_out_unnorm,signal_out); endmodule // cic_decim |