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Added 8-bit to 10-bit coefficient expander

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This commit is contained in:
Niels Moseley 2017-10-23 20:53:02 +02:00
parent 704cd3d4cb
commit 48322725f6
10 changed files with 2180 additions and 2097 deletions
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19
verilog/controller/controller.v
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@ -1,5 +1,5 @@
//
// Speecht256 top level
// Speech256 controller / sequencer
//
// Niels Moseley - Moseley Instruments 2017
// http://www.moseleyinstruments.com
@ -28,7 +28,7 @@ module CONTROLLER (
//////////// OUTPUTS //////////
output reg ldq;
output reg coeff_stb;
output reg signed [7:0] coeff_out;
output reg signed [9:0] coeff_out;
output reg [15:0] amp_out;
output reg [7:0] period_out;
//output reg [7:0] dur_out;
@ -76,8 +76,11 @@ module CONTROLLER (
reg [2:0] coeff_cnt;
reg [1:0] coeff_cnt_update;
wire [9:0] coeff10bit;
wire done;
// control program ROM
CTRLROM u_ctrlrom (
.clk (clk),
.data (rom_data),
@ -95,6 +98,12 @@ module CONTROLLER (
COEFF_CNT_NOP = 2'b01, // do nothing
COEFF_CNT_INC = 2'b10; // increment coefficient counter
// 8-bit -> 10-bit coefficient expander
XLAT u_xlat (
.c8_in(rom_data),
.c10_out(coeff10bit)
);
always @(posedge clk, negedge rst_an)
begin
if (rst_an == 0)
@ -156,7 +165,7 @@ module CONTROLLER (
if (serve_pitch_data)
begin
duration <= dur_tmp;
amp_out <= amp_tmp;
amp_out <= {4'b0000, amp_tmp[15:4]};
period_out <= period_tmp;
end
@ -332,7 +341,7 @@ module CONTROLLER (
// send F coefficient
begin
coeff_stb <= 1;
coeff_out <= rom_data;
coeff_out <= coeff10bit;
coeff_cnt_update <= COEFF_CNT_INC;
rom_addr_sel <= ROM_ADDR_INC;
next_state <= S_LOADCOEF2;
@ -341,7 +350,7 @@ module CONTROLLER (
// send B coefficient
begin
coeff_stb <= 1;
coeff_out <= rom_data;
coeff_out <= coeff10bit;
if (coeff_cnt == 3'd6)
next_state <= S_CMDDECODE; // load next section
else

4
verilog/controller/controller_tb.v
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@ -1,5 +1,5 @@
//
// PWMDAC testbench
// Controller testbench
//
// Niels Moseley - Moseley Instruments 2017
// http://www.moseleyinstruments.com
@ -13,7 +13,7 @@ module CONTROLLER_TB;
reg period_done;
wire ldq;
wire signed [7:0] coeff;
wire [9:0] coeff;
wire coeff_load;
wire [7:0] period;
wire [15:0] amp;

4162
verilog/controller/ctrlrom.v
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File diff suppressed because it is too large Load Diff

4
verilog/controller/genctrlrom.py
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@ -51,10 +51,8 @@ def convertFilterCoeff(c):
# 254 -> 2
# 128 -> xxx
# 0 -> 0
if (c == 0):
return 0
return (256-c);
return c;
fout = open('ctrlrom.v','wt')

7
verilog/controller/run_tb.bat
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@ -1,7 +1,12 @@
python genctrlrom.py
mkdir bin
del bin\controller.vvp
C:\iverilog\bin\iverilog -o bin\controller.vvp -m va_math -g2005 -s CONTROLLER_TB controller.v controller_tb.v ctrlrom.v
del bin\xlat.vvp
C:\iverilog\bin\iverilog -o bin\xlat.vvp -m va_math -g2005 -s XLAT_TB xlat.v xlat_tb.v
C:\iverilog\bin\iverilog -o bin\controller.vvp -m va_math -g2005 -s CONTROLLER_TB controller.v controller_tb.v ctrlrom.v xlat.v
cd bin
@echo --== Running XLAT testbench ==--
C:\iverilog\bin\vvp xlat.vvp -lxt2
@echo --== Running CONTROLLER testbench ==--
C:\iverilog\bin\vvp controller.vvp -lxt2
cd ..

40
verilog/controller/xlat.v Normal file
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@ -0,0 +1,40 @@
//
// 8-bit sign-magnitude to 10-bit sign-magnitude
// conversion block
//
// Niels Moseley - Moseley Instruments 2017
// http://www.moseleyinstruments.com
//
//
// C1: x*8
// C2: 301 + (x-38)*4 = 301 - 152 + x*4 = 149 + x*4
// C3: 425 + (x-69)*2 = 425 - 138 + x*2 = 287 + x*2
// C4: 481 + (x-97) = 481 - 97 + x = 384 + x
//
//
//
//
module XLAT (
c8_in,
c10_out
);
input [7:0] c8_in;
output reg [9:0] c10_out;
wire sign;
assign sign = ~c8_in[7];
always@(*)
begin
if (c8_in[6:0] < 38)
c10_out <= {sign, c8_in[5:0], 3'b000};
else if (c8_in[6:0] < 69)
c10_out <= {sign, {c8_in[6:0], 2'b00} + 9'd149};
else if (c8_in[6:0] < 97)
c10_out <= {sign, {{1'b0, c8_in[6:0]}, 1'b0} + 9'd287};
else
c10_out <= {sign, {{2'b00, c8_in[6:0]} + 9'd384}};
end
endmodule

31
verilog/controller/xlat_tb.v Normal file
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@ -0,0 +1,31 @@
//
// XLAT testbench
//
// Niels Moseley - Moseley Instruments 2017
// http://www.moseleyinstruments.com
//
module XLAT_TB;
reg [7:0] c8_in;
wire [9:0] c10_out;
XLAT u_xlat (
c8_in,
c10_out
);
integer i;
initial
begin
$dumpfile ("xlat.vcd");
$dumpvars;
c8_in[7] = 0;
for(i=0; i<128; i=i+1)
begin
c8_in[6:0] = i;
#10;
end
$finish;
end
endmodule

2
verilog/pwmdac/pwmdac.v
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@ -58,7 +58,7 @@ module PWMDAC (
dacout <= 0;
// load new data into DAC when
// counter is 255
// counter is 127
if (counter == 8'h7F)
begin
data <= din;

2
verilog/speech256_top/run_tb.bat
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@ -1,6 +1,6 @@
mkdir bin
del bin\speech256_top.vvp
C:\iverilog\bin\iverilog -o bin\speech256_top.vvp -m va_math -g2005 -s SPEECH256_TOP_TB speech256_top.v speech256_top_tb.v ..\filter\filter.v ..\source\source.v ..\spmul\spmul.v ..\pwmdac\pwmdac.v ..\controller\controller.v ..\controller\ctrlrom.v
C:\iverilog\bin\iverilog -o bin\speech256_top.vvp -m va_math -g2005 -s SPEECH256_TOP_TB speech256_top.v speech256_top_tb.v ..\filter\filter.v ..\source\source.v ..\spmul\spmul.v ..\pwmdac\pwmdac.v ..\controller\controller.v ..\controller\ctrlrom.v ..\controller\xlat.v
cd bin
C:\iverilog\bin\vvp speech256_top.vvp -lxt2
cd ..

4
verilog/speech256_top/speech256_top.v
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@ -40,7 +40,7 @@ module SPEECH256_TOP (
wire [7:0] dur;
wire [15:0] amp;
wire signed [7:0] coef_bus;
wire signed [9:0] coef_bus;
wire coef_load;
wire done;
@ -58,7 +58,7 @@ module SPEECH256_TOP (
FILTER u_filter (
.clk (clk),
.rst_an (rst_an),
.coef_in ({coef_bus, 1'b0}),
.coef_in (coef_bus),
.coef_load (coef_load),
.sig_in (sig_source),
.sig_out (sig_filter),