always @(posedge clk or negedge rst_n) if(!rst_n) begin key_v <= 4'b0000; new_value <= 4'd0; new_rdy <= 1'b0; end else begin case(cstate) K_IDLE: begin key_v <= 4'b0000; new_value <= 4'd0; new_rdy <= 1'b0; end K_H1OL: begin key_v <= 4'b1110; new_value <= 4'd0; new_rdy <= 1'b0; end K_H2OL: begin case(key_h) 4'b1110: begin key_v <= 4'b0000; new_value <= 4'd0; new_rdy <= 1'b1; end 4'b1101: begin key_v <= 4'b0000; new_value <= 4'd1; new_rdy <= 1'b1; end 4'b1011: begin key_v <= 4'b0000; new_value <= 4'd2; new_rdy <= 1'b1; end 4'b0111: begin key_v <= 4'b0000; new_value <= 4'd3; new_rdy <= 1'b1; end default: begin key_v <= 4'b1101; new_value <= 4'd0; new_rdy <= 1'b0; end endcase end K_H3OL: begin case(key_h) 4'b1110: begin key_v <= 4'b0000; new_value <= 4'd4; new_rdy <= 1'b1; end 4'b1101: begin key_v <= 4'b0000; new_value <= 4'd5; new_rdy <= 1'b1; end 4'b1011: begin key_v <= 4'b0000; new_value <= 4'd6; new_rdy <= 1'b1; end 4'b0111: begin key_v <= 4'b0000; new_value <= 4'd7; new_rdy <= 1'b1; end default: begin key_v <= 4'b1011; new_value <= 4'd0; new_rdy <= 1'b0; end endcase end K_H4OL: begin case(key_h) 4'b1110: begin key_v <= 4'b0000; new_value <= 4'd8; new_rdy <= 1'b1; end 4'b1101: begin key_v <= 4'b0000; new_value <= 4'd9; new_rdy <= 1'b1; end 4'b1011: begin key_v <= 4'b0000; new_value <= 4'd10; new_rdy <= 1'b1; end 4'b0111: begin key_v <= 4'b0000; new_value <= 4'd15; new_rdy <= 1'b1; end default: begin key_v <= 4'b0000; new_value <= 4'd0; new_rdy <= 1'b0; end endcase end default: ; endcase end
时间: 2024-03-31 14:31:57 浏览: 22
这是一个修改后的 Verilog 代码段,对之前的代码进行了修改,增加了一些功能。该代码段仍然描述一个状态机的行为,有多个状态,如 K_IDLE,K_H1OL,K_H2OL 等。每当时钟信号或复位信号发生变化时,状态机会根据当前状态和输入值(keyh_value 和 key_h)来计算下一个状态(nstate)。与之前不同的是,这个代码段在每个状态下都对 key_v、new_value 和 new_rdy 进行了赋值操作。这些变量的含义是:
- key_v:表示键盘输入的值,4 位二进制数。
- new_value:表示新输出的值,4 位十进制数。
- new_rdy:表示新值是否可用,1 位二进制数。
根据当前状态和输入的键盘值 key_h,状态机会计算对应的 key_v、new_value 和 new_rdy。
相关问题
always @(posedge clk or negedge rst_n) if(rst_n) clk_1 <= 1'b0; else clk_1 <= clk_0; always @(posedge clk or negedge rst_n) if(rst_n) clk_2 <= 1'b0; else clk_2 <= clk_1; always @(posedge clk or negedge rst_n) if(rst_n) clk_3 <= 1'b0; else clk_3 <= clk_2;
这段代码展示了三个时钟信号(clk_1, clk_2, clk_3)的递推关系。当复位信号 rst_n 为高电平时,所有时钟信号都被重置为低电平。否则,每个时钟信号都是前一个时钟信号的延迟版本。也就是说,clk_1 是 clk_0 的延迟版本,clk_2 是 clk_1 的延迟版本,以此类推。这种递推关系可以用于时钟延迟和同步电路设计中。请问有什么问题我可以帮助您解答的吗?
module crc8( data_in, clk, rst_n, crc7, crc6, crc5, crc4, crc3, crc2, crc1, crc0 ); input wire data_in; input wire clk; input wire rst_n; output wire crc7; output wire crc6; output wire crc5; output wire crc4; output wire crc3; output wire crc2; output wire crc1; output wire crc0; wire SYNTHESIZED_WIRE_5; reg DFF_inst8; reg DFF_inst; wire SYNTHESIZED_WIRE_2; wire SYNTHESIZED_WIRE_3; reg DFF_inst3; reg DFF_inst4; reg DFF_inst5; reg DFF_inst6; reg DFF_inst7; reg DFF_inst2; assign crc7 = DFF_inst8; assign crc6 = DFF_inst7; assign crc5 = DFF_inst6; assign crc4 = DFF_inst5; assign crc3 = DFF_inst4; assign crc2 = DFF_inst3; assign crc1 = DFF_inst2; assign crc0 = DFF_inst; always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst <= 1; end else begin DFF_inst <= SYNTHESIZED_WIRE_5; end end assign SYNTHESIZED_WIRE_5 = data_in ^ DFF_inst8; assign SYNTHESIZED_WIRE_2 = SYNTHESIZED_WIRE_5 ^ DFF_inst; always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst2 <= 1; end else begin DFF_inst2 <= SYNTHESIZED_WIRE_2; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst3 <= 1; end else begin DFF_inst3 <= SYNTHESIZED_WIRE_3; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst4 <= 1; end else begin DFF_inst4 <= DFF_inst3; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst5 <= 1; end else begin DFF_inst5 <= DFF_inst4; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst6 <= 1; end else begin DFF_inst6 <= DFF_inst5; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst7 <= 1; end else begin DFF_inst7 <= DFF_inst6; end end always@(posedge clk or negedge rst_n) begin if (!rst_n) begin DFF_inst8 <= 1; end else begin DFF_inst8 <= DFF_inst7; end end assign SYNTHESIZED_WIRE_3 = SYNTHESIZED_WIRE_5 ^ DFF_inst2; endmodule 把这个代码修改成CRC-12编码器
好的,这里是修改后的CRC-12编码器代码:
```verilog
module crc12 (
input wire [11:0] data_in,
input wire clk,
input wire rst_n,
output wire [11:0] crc_out
);
reg [11:0] crc_reg;
wire [11:0] crc_next;
assign crc_out = crc_reg;
always @(posedge clk or negedge rst_n) begin
if (~rst_n) begin
crc_reg <= 12'hFFF;
end else begin
crc_reg <= crc_next;
end
end
assign crc_next[11:0] = {crc_reg[10:0], 1'b0} ^ (data_in << 4);
always @* begin
if (crc_reg[11]) begin
crc_next[10:0] = crc_reg[10:0] ^ 12'h80F;
end else begin
crc_next[10:0] = crc_reg[10:0];
end
end
endmodule
```
这个代码使用一个12位的寄存器来保存CRC值,并且使用一个组合逻辑块来计算下一个CRC值。具体来说,每当时钟上升沿到来或者复位信号为低电平时,都会更新CRC寄存器的值。下一个CRC值的计算是通过将当前CRC值左移4位,然后异或输入数据得到的。最后,还需要根据CRC的最高位进行异或运算,以实现CRC校验的效果。
相关推荐
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)