output reg[99:0]q);always@(posedge clk)beginif(load==1)q<=data;elsebeginif(ena==2'b01)//右移一位q<={q[0],q[99:1]};elseif(ena==2'b10)//左移一位q<={q[98:0],q[99]};elseif(ena==2'b00|ena==2'b11)q<=q;end end endmodule 103.l
【例7.1】调用门元件实现的4选1 MUX- 16 - 王金明:《Verilog HDL程序设计教程》module mux4_1a(out,in1,in2,in3,in4,cntrl1,cntrl2); output out; input in1,in2,in3,in4,cntrl1,cntrl2; wire notcntrl1,notcntrl2,w,x,y,z; not notcntrl1,cntrl2), ...
refer to the Design Constraints chapter. For information about the Verilog attribute syntax, see the Verilog Meta Comment Syntax section of the Design Constraints chapter. For information on setting Verilog options in the Process window of the Project Navigator, refer to the Setting Global Constraints...
重置应将 LFSR 重置为 1。 1moduletop_module(2inputclk,3inputreset,// Active-high synchronous reset to 5'h14output[4:0]q5);67always@(posedgeclk)begin8if(reset)begin9q<=5'h1;10endelsebegin11q[0]<=q[1];12q[1]<=q[2];13q[2]<=q[3]^q[0];14q[3]<=q[4];15q[4]<=1'b0^...
ANDgatecodethatworksproperly Doesnotdeclarevariable“i”–when“i”usedinaloop,itgets implicitlydeclared modulewill_work(); wiretemp,bit; always@(a_bus) begin temp=1; for(i=7;i>=0;i=i-1) begin temp=a_bus(i)andtemp; end end
ena[1:0]: Chooses whether and which direction to rotate. 2'b01 rotates right by one bit 2'b10 rotates left by one bit 2'b00 and 2'b11 do not rotate. q: The contents of the rotator. 白话:构建一个100位的,可以左移或右移的,旋转位移寄存器。当load=1时,载入data;ena控制旋转方向:ena...
AND gate code that works properly Does not declare variable “i” – when “i” used in a loop, it gets implicitly declared module will_work (); wire temp, bit; always @(a_bus) begin temp = 1; for (i = 7; i >= 0; i = i - 1) ...
【例5.1】用case语句描述的4选1数据选择器 module mux4_1(out,in0,in1,in2,in3,sel); output out; input in0,in1,in2,in3; input[1:0] sel; reg out; always @(in0 or in1 or in2 or in3 or sel) //敏感信号列表 case(sel) ...