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ad_dds: Add selectable phase width option.

main
AndreiGrozav 2018-05-31 15:31:30 +01:00 committed by AndreiGrozav
parent 7b553997ab
commit a7f5746afb
3 changed files with 37 additions and 33 deletions
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1
library/common/ad_dds.v
View File

@ -122,6 +122,7 @@ module ad_dds #(
// phase to amplitude convertor
ad_dds_2 #(
.DDS_DW (DDS_DW),
.PHASE_DW (PHASE_DW),
.DDS_TYPE (DDS_TYPE),
.CORDIC_DW (CORDIC_DW),
.CORDIC_PHASE_DW (CORDIC_PHASE_DW))

12
library/common/ad_dds_1.v
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@ -65,23 +65,13 @@ module ad_dds_1 #(
generate
if (DDS_TYPE == DDS_CORDIC_TYPE) begin
// the cordic module input angle width must be equal with it's width
// at this point the phase is only generated on 16 bits
wire [DDS_P_DW-1:0] angle_s;
if (DDS_P_DW >= 16) begin
assign angle_s = {angle,{DDS_P_DW-15{1'b0}}};
end else begin
assign angle_s = {angle[15:16-DDS_P_DW],1'b0};
end
ad_dds_sine_cordic #(
.CORDIC_DW(DDS_D_DW),
.PHASE_DW(DDS_P_DW),
.DELAY_DW(1))
i_dds_sine (
.clk (clk),
.angle (angle_s),
.angle (angle),
.sine (sine_s),
.cosine (),
.ddata_in (1'b0),

27
library/common/ad_dds_2.v
View File

@ -41,6 +41,8 @@ module ad_dds_2 #(
parameter DISABLE = 0,
// Range = 8-24
parameter DDS_DW = 16,
// Range = 8-24
parameter PHASE_DW = 16,
// Set 1 for CORDIC or 2 for Polynomial
parameter DDS_TYPE = 1,
// Range = 8-24
@ -52,11 +54,11 @@ module ad_dds_2 #(
input clk,
input dds_format,
input [ 15:0] dds_phase_0,
input [PHASE_DW-1:0] dds_phase_0,
input [ 15:0] dds_scale_0,
input [ 15:0] dds_phase_1,
input [PHASE_DW-1:0] dds_phase_1,
input [ 15:0] dds_scale_1,
output [DDS_DW-1:0] dds_data);
output [ DDS_DW-1:0] dds_data);
// Local parameters
@ -80,8 +82,10 @@ module ad_dds_2 #(
// internal signals
wire [15:0] dds_data_0_s;
wire [15:0] dds_data_1_s;
wire [DDS_D_DW-1:0] dds_data_0_s;
wire [DDS_D_DW-1:0] dds_data_1_s;
wire [DDS_P_DW-1:0] dds_phase_0_s;
wire [DDS_P_DW-1:0] dds_phase_1_s;
// disable DDS
generate
@ -120,6 +124,15 @@ module ad_dds_2 #(
dds_scale_1_d <= dds_scale_1;
end
// phase
if (DDS_P_DW >= PHASE_DW) begin
assign dds_phase_0_s = {dds_phase_0,{DDS_P_DW-(PHASE_DW-1){1'b0}}};
assign dds_phase_1_s = {dds_phase_1,{DDS_P_DW-(PHASE_DW-1){1'b0}}};
end else begin
assign dds_phase_0_s = {dds_phase_0[(PHASE_DW-1):PHASE_DW-DDS_P_DW],1'b0};
assign dds_phase_1_s = {dds_phase_1[(PHASE_DW-1):PHASE_DW-DDS_P_DW],1'b0};
end
// dds-1
ad_dds_1 #(
@ -128,7 +141,7 @@ module ad_dds_2 #(
.DDS_P_DW(CORDIC_PHASE_DW))
i_dds_1_0 (
.clk (clk),
.angle (dds_phase_0),
.angle (dds_phase_0_s),
.scale (dds_scale_0_d),
.dds_data (dds_data_0_s));
@ -140,7 +153,7 @@ module ad_dds_2 #(
.DDS_P_DW(DDS_P_DW))
i_dds_1_1 (
.clk (clk),
.angle (dds_phase_1),
.angle (dds_phase_1_s),
.scale (dds_scale_1_d),
.dds_data (dds_data_1_s));
end