diff options
| -rw-r--r-- | sdr_lib/dsp_core_tx.v | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/sdr_lib/dsp_core_tx.v b/sdr_lib/dsp_core_tx.v index 54889fa2a..346d65ced 100644 --- a/sdr_lib/dsp_core_tx.v +++ b/sdr_lib/dsp_core_tx.v @@ -103,15 +103,21 @@ module dsp_core_tx .signal_in(hb2_q),.signal_out(q_interp)); assign strobe = strobe_hb1; - - cordic #(.bitwidth(18),.zwidth(16)) + + localparam cwidth = 24; // was 18 + localparam zwidth = 24; // was 16 + + wire [cwidth-1:0] da_c, db_c; + + cordic_z24 #(.bitwidth(cwidth)) cordic(.clock(clk), .reset(rst), .enable(run), - .xi(i_interp),.yi(q_interp),.zi(phase[31:16]), - .xo(da),.yo(db),.zo() ); + .xi({i_interp,{(cwidth-18){1'b0}}}),.yi({q_interp,{(cwidth-18){1'b0}}}), + .zi(phase[31:32-zwidth]), + .xo(da_c),.yo(db_c),.zo() ); MULT18X18S MULT18X18S_inst (.P(prod_i), // 36-bit multiplier output - .A(da), // 18-bit multiplier input + .A(da_c[cwidth-1:cwidth-18]), // 18-bit multiplier input .B({{2{scale_i[15]}},scale_i}), // 18-bit multiplier input .C(clk), // Clock input .CE(1), // Clock enable input @@ -120,7 +126,7 @@ module dsp_core_tx MULT18X18S MULT18X18S_inst_2 (.P(prod_q), // 36-bit multiplier output - .A(db), // 18-bit multiplier input + .A(db_c[cwidth-1:cwidth-18]), // 18-bit multiplier input .B({{2{scale_q[15]}},scale_q}), // 18-bit multiplier input .C(clk), // Clock input .CE(1), // Clock enable input |