always_comb begin b = 1'b0; unique case (a[3:0]) 4'd1: begin b = 1'b1; end 4'd0: begin b = 1'b0; end default: begin end endcase end priority case case块内有优先级,串行比较 (依次比较) always_comb begin priority case (1'b1) a[3]: begin end a[2]: begin end default...
组合逻辑 always_comb begincase(curr_state)s0: beginout1 = 1'b1;out2 = 1'b0;ends1: beginout1 = in1;out2 = 1'b1;ends2: beginout1 = 1'b1;out2 = in2;enddefault: beginout1 = 1'b0;out2 = 1'b0;endendcaseend
这些赋值类型影响仿真更新赋值语句左侧值的顺序,相对于仿真时那一刻的任何其他仿真活动。阻塞赋值(=)立即更新左侧的变量,使新值可供begin-end语句组中的后续语句使用。“即时更新”有效地仿真了组合逻辑数据流中的值传播行为。 下面的代码片段演示了通过组合逻辑程序块中的多个赋值的组合逻辑数据流。 在这个过程中,变...
,output logic [3:0] result, output logic EQ ); always_comb begin if(oppCode == 3'b010) begin // Problem result <= rf1 - rf2; end else if(oppCode == 3'b101) begin // Problem result <= rf1 + rf2; end else if(oppCode == 3'b111) begin // Problem EQ <= (rf1 == r...
always_comb begin b = a; c = b; // c = a end // Example 2 always_comb begin c = b; // starting value of c = previous value of a b = a; // changing b does not re-trigger the always_comb in this time step end
组合逻辑 always_comb begincase(curr_state)s0: beginout1 = 1'b1;out2 = 1'b0;ends1: beginout1 = in1;out2 = 1'b1;ends2: beginout1 = 1'b1;out2 = in2;enddefault: beginout1 = 1'b0;out2 = 1'b0;endendcaseend
问SystemVerilog，if语句在always_comb块内的顺序EN我正在分析别人写的有限状态机，我不明白如果所有的if...
always_combbegin$display("%2g, always_comb : in_vld = %b", $time, in_vld);if(in_vld)beginpkt[HIBIT-:WIDTH] = in_data; pkt_size = {<<8{pkt[HIBIT-:16]}};endelsebeginpkt = {WIDTH{1'hx}}; pkt_size ='d0;endendalways_ff @(posedge clkornegedge reset_n)begin...
input [7:0] B; output [7:0] G; reg [7:0] G; always @(B) begin: BIN2GRAY_LOGIC G = ((B >>> 1) ^ B); // pass end I really don't understand the peculiarities between the different Verilog conversions, here. But it suggests that the use of reg in this example is going...
begin if6.in.data = if1.data; if7.in.data = if1.out.data; end initial begin if1.in.data = 0; #100; $finish; end endmodule Expand Post LikeReply markcurry (Member) 8 years ago I think that this is a bug in Vivado and should be fixed. The always_comb do...