Created
September 16, 2016 16:47
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verilog queue
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module queue(clk, trig, q, write_en); | |
parameter BUFF_SIZE=20; | |
input clk; | |
input trig; | |
output reg [7:0] q = 0; | |
output reg write_en; | |
reg [8*BUFF_SIZE:1] buff=0; | |
reg [15:0] buff_size = 0; | |
reg [7:0] out = 0; | |
reg i=0; | |
always @(posedge clk) begin | |
if (trig == 1 && buff_size < BUFF_SIZE - 3) begin | |
buff[8*(BUFF_SIZE-buff_size)-:3*8] <= "$SE"; | |
buff_size <= buff_size + 3; | |
i <= 1; | |
end | |
q <= out; | |
if (i == 1) | |
write_en <= 1; | |
if (buff_size == 0 && i == 0) | |
write_en <= 0; | |
end | |
always @(negedge clk) begin | |
if (buff_size > 0) begin | |
buff <= {buff[8*BUFF_SIZE-8:1],8'b0}; | |
buff_size <= buff_size - 1; | |
out <= buff[8*BUFF_SIZE:8*(BUFF_SIZE-1)+1]; | |
end | |
if (buff_size == 0) | |
i <= 0; | |
end | |
endmodule |
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module queue_tb; | |
reg clk; | |
reg trig; | |
wire [7:0] data; | |
wire write_en; | |
queue queue1(clk,trig,data,write_en); | |
initial begin | |
clk = 0; | |
forever begin | |
#5 clk = ~clk; | |
end | |
end | |
initial begin | |
$monitor("data=%c,write_en=%d", data, write_en); | |
trig = 0; | |
#5 trig = 1; | |
#20 trig = 0; | |
#50 trig = 1; | |
#55 trig = 0; | |
#80 $finish; | |
end | |
endmodule |
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