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Modified dds so that if freq=0 output is also zero.

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T-moe
2016-06-13 12:15:39 +02:00
parent 6e05cdb6e8
commit f0960edf3c
1 changed files with 5 additions and 5 deletions
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10
dds.vhd
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@@ -83,11 +83,11 @@ begin
to_unsigned((2**(adc_res-1)) - 1,adc_res) - sin_wave(to_integer(idx_phase(phase_res-3 downto 0))) when idx_phase(phase_res-1 downto phase_res-2)="10" else
to_unsigned((2**(adc_res-1)) - 1,adc_res) - sin_wave(to_integer(((2**(phase_res-2))-1) - idx_phase(phase_res-3 downto 0)));
with form select amp <= amp_rect when "00",
amp_saw when "01",
amp_tria when "10",
amp_sin when others;
amp <= to_unsigned(0,adc_res) when freq = to_unsigned(0,freq_res) else
amp_rect when form = "00" else
amp_saw when form ="01" else
amp_tria when form = "10" else
amp_sin;
P1: process(clk)
begin