Я пишу код, выполняющий метод трапецеидального интегрирования. В коде есть часы FPGA (я использую Mimas Spartan 6), SIGNAL (новая точка, которую необходимо учитывать при интегрировании), x (интервал между точками) и SUM (результат прошлых интегрирований для входов). , а выход — OUT. Поскольку для трапециевидного метода должно быть два входа, есть два регистра yregone и yregtwo, так что SIGNAL устанавливается в yregone, а yregtwo — в старый yregone (прошлый SIGNAL). добавляется, затем бит сдвигается так, что он делится на два, умножается на x, а затем добавляется SUM (OUT отображается на SUM на плате).
Код компилируется с выданными предупреждениями. Я где-то читал, что предупреждения можно игнорировать. Код скомпилировался, несмотря на ошибки, поэтому я попытался загрузить код на плату, и он сказал, что конфигурация не удалась. Поэтому я предположил, что предупреждения должны указывать на какую-то ошибку в коде, которую необходимо исправить. Что случилось?
Код
module trapverilog(
input CLK,
input signed [7:0] SIGNAL,
input [7:0] x,
input signed [20:0] SUM, // OUT pins are mapped to SUM pins on board
output reg OUT1,
output reg OUT2,
output reg OUT3,
output reg OUT4,
output reg OUT5,
output reg OUT6,
output reg OUT7,
output reg OUT8,
output reg OUT9,
output reg OUT10,
output reg OUT11,
output reg OUT12,
output reg OUT13,
output reg OUT14,
output reg OUT15,
output reg OUT16,
output reg OUT17,
output reg OUT18,
output reg OUT19,
output reg OUT20
);
reg signed [7:0] yregone;
reg signed [7:0] yregtwo;
reg signed [20:0] innerSumOutput;
reg signed [20:0] innerSum;
function [20:0] multiply;
input signed [7:0] a;
input signed [7:0] b;
reg [15:0] a1, a2, a3, a4, a5, a6, a7, a8;
begin
a1 = (b[0]==1'b1) ? {8'b00000000, a} : 16'b0000000000000000;
a2 = (b[1]==1'b1) ? {7'b0000000, a, 1'b0} : 16'b0000000000000000;
a3 = (b[2]==1'b1) ? {6'b000000, a, 2'b00} : 16'b0000000000000000;
a4 = (b[3]==1'b1) ? {5'b00000, a, 3'b000} : 16'b0000000000000000;
a5 = (b[4]==1'b1) ? {4'b0000, a, 4'b0000} : 16'b0000000000000000;
a6 = (b[5]==1'b1) ? {3'b000, a, 5'b00000} : 16'b0000000000000000;
a7 = (b[6]==1'b1) ? {2'b00, a, 6'b000000} : 16'b0000000000000000;
a8 = (b[7]==1'b1) ? {1'b0, a, 7'b0000000} : 16'b0000000000000000;
multiply = a1 + a2 + a3 + a4 + a5 + a6 + a7 + a8;
end
endfunction
always @(posedge CLK)
begin
yregtwo <= yregone;
yregone <= SIGNAL;
if (yregone != 0)
begin
innerSum <= multiply((yregone + yregtwo), x); // treats x as plain h, change if treated as h/2 // multiply defined by function shift-adds
innerSumOutput <= (innerSum <<< 1) + SUM; // <<< is signed one bit shift which = /2
OUT20 <= innerSumOutput[20];
OUT1 <= innerSumOutput[1]; // OUT is two's complement
OUT2 <= innerSumOutput[2];
OUT3 <= innerSumOutput[3];
OUT4 <= innerSumOutput[4];
OUT5 <= innerSumOutput[5];
OUT6 <= innerSumOutput[6];
OUT7 <= innerSumOutput[7];
OUT8 <= innerSumOutput[8];
OUT9 <= innerSumOutput[9];
OUT10 <= innerSumOutput[10];
OUT11 <= innerSumOutput[11];
OUT12 <= innerSumOutput[12];
OUT13 <= innerSumOutput[13];
OUT14 <= innerSumOutput[14];
OUT15 <= innerSumOutput[15];
OUT16 <= innerSumOutput[16];
OUT17 <= innerSumOutput[17];
OUT18 <= innerSumOutput[18];
OUT19 <= innerSumOutput[19];
end
end
endmodule
УКФ
NET "CLK" LOC = P126;
NET "SIGNAL[0]" LOC = P35 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SIGNAL[1]" LOC = P34 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SIGNAL[2]" LOC = P33 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SIGNAL[3]" LOC = P32 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SIGNAL[4]" LOC = P30 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SIGNAL[5]" LOC = P29 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SIGNAL[6]" LOC = P27 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SIGNAL[7]" LOC = P26 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[0]" LOC = P24 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[1]" LOC = P23 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[2]" LOC = P22 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[3]" LOC = P21 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[4]" LOC = P17 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[5]" LOC = P16 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[6]" LOC = P15 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "x[7]" LOC = P14 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SUM[0]" LOC = P12 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SUM[1]" LOC = P11 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST;
NET "SUM[2]" LOC = P10 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[3]" LOC = P9 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[4]" LOC = P8 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[5]" LOC = P7 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[6]" LOC = P6 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[7]" LOC = P5 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[8]" LOC = P2 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[9]" LOC = P1 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[10]" LOC = P142 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[11]" LOC = P141 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[12]" LOC = P140 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[13]" LOC = P139 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[14]" LOC = P138 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[15]" LOC = P137 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[16]" LOC = P134 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[17]" LOC = P133 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[18]" LOC = P132 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[19]" LOC = P131 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "SUM[20]" LOC = P43 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT1" LOC = P44 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT2" LOC = P45 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT3" LOC = P46 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT4" LOC = P47 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT5" LOC = P48 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT6" LOC = P50 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT7" LOC = P51 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT8" LOC = P55 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT9" LOC = P56 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT10" LOC = P74 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT11" LOC = P75 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT12" LOC = P78 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT13" LOC = P79 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT14" LOC = P80 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT15" LOC = P81 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT16" LOC = P82 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT17" LOC = P83 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT18" LOC = P84 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT19" LOC = P85 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
NET "OUT20" LOC = P87 | IOSTANDARD = LVCMOS33 | DRIVE = 8 | SLEW = FAST ;
Предупреждения
WARNING:Xst:2677 - Node <innerSum_20> of sequential type is unconnected in block <trapverilog>.
WARNING:Xst:2677 - Node <innerSumOutput_0> of sequential type is unconnected in block <trapverilog>.
WARNING:Xst:2677 - Node <innerSum_20> of sequential type is unconnected in block <trapverilog>.
WARNING:Xst:2677 - Node <innerSumOutput_0> of sequential type is unconnected in block <trapverilog>.
WARNING:Xst:1710 - FF/Latch <innerSum_19> (without init value) has a constant value of 0 in block <trapverilog>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1710 - FF/Latch <innerSum_16> (without init value) has a constant value of 0 in block <trapverilog>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <innerSum_17> (without init value) has a constant value of 0 in block <trapverilog>. This FF/Latch will be trimmed during the optimization process.
WARNING:Xst:1895 - Due to other FF/Latch trimming, FF/Latch <innerSum_18> (without init value) has a constant value of 0 in block <trapverilog>. This FF/Latch will be trimmed during the optimization process.
WARNING:Security:42 - Your software subscription period has lapsed. Your current
WARNING:Security:42 - Your software subscription period has lapsed. Your current version of Xilinx tools will continue
WARNING:Par:288 - The signal SUM<0>_IBUF has no load. PAR will not attempt to route this signal.
WARNING:Par:283 - There are 1 loadless signals in this design. This design will cause Bitgen to issue DRC warnings.