米勒型有限状态机实现的串行口发送源程序
本帖最后由 fpgaw 于 2010-11-18 15:58 编辑米勒型有限状态机实现的串行口发送源程序
module s_tx(clk,en,dain,txd);
input clk,en;
input dain;
output txd;
reg da_temp;
reg txd;
reg state;
parameter swait=4'b0000, star=4'b0001,s1=4'b0010,s2=4'b0011,
s3=4'b0100,s4=4'b0101,s5=4'b0110,s6=4'b0111,s7=4'b1000,
s8=4'b1001, stop=4'b1010;
always @(posedge en)
da_temp<=dain;
always @(posedge clk)
if (!en)
begin
state<=swait;
txd<=1;
end
else
case(state)
swait: begin state<=star;txd<=1; end
star: begin state<=s1; txd<=0; end
s1: begin state<=s2; txd<=da_temp; end
s2: begin state<=s3; txd<=da_temp; end
s3: begin state<=s4; txd<=da_temp; end
s4: begin state<=s5; txd<=da_temp; end
s5: begin state<=s6; txd<=da_temp; end
s6: begin state<=s7; txd<=da_temp; end
s7: begin state<=s8; txd<=da_temp; end
s8: begin state<=stop; txd<=da_temp; end
stop: begin state<=stop; txd<=1; end
endcase
endmodule 学习学习！学习学习！ 嗯， 多帮我顶下贴子
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