reg idle_time_over_r ; always @ (posedge clk) begin if (rst) idle_time_over_r <= 1'b0 ; else if (idle_time_over) idle_time_over_r <= 1'b1 ; end

时间: 2023-09-03 11:07:47 浏览: 32
这段代码是一个时钟上升沿触发的始终块。它根据条件更新`idle_time_over_r`寄存器的值。 在开始时,如果`rst`信号为高电平,说明复位信号被触发,那么`idle_time_over_r`将被重置为0。 接下来,如果`idle_time_over`信号为高电平,说明空闲时间已经超过了预设值,那么`idle_time_over_r`将被设置为1。 总体来说,这段代码用于根据复位信号和空闲时间超过预设值的条件来更新`idle_time_over_r`寄存器的值。它用于表示空闲时间是否已经超过预设值的状态。
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always @ (posedge clk) begin if (rst) idle_time_cnt <= 0 ; else if (sclk_rising ) idle_time_cnt <= 0 ; else if (idle_time_cnt == 32'hFFFFFFFF) idle_time_cnt <= idle_time_cnt ; else idle_time_cnt <= idle_time_cnt + 1 ; end

这段代码是一个时钟上升沿触发的始终块。根据条件,`idle_time_cnt`的值将被更新。 在开始时,如果`rst`信号为高电平,说明复位信号被触发,那么`idle_time_cnt`将被重置为0。 接下来,如果`sclk_rising`信号为高电平,说明时钟上升沿被触发,也需要将`idle_time_cnt`重置为0。 然后,检查`idle_time_cnt`是否等于32'hFFFFFFFF(32位全1的值)。如果是,则将`idle_time_cnt`保持不变。 最后,如果以上条件都不满足,即未触发复位、时钟上升沿或达到最大计数值,那么`idle_time_cnt`将递增1。 总体来说,这段代码用于更新和计数`idle_time_cnt`变量,用于跟踪空闲时间的计数。

always @ (posedge clk) begin if (rst) all_bit_shift_cnt <= 8'd0 ; else if (sclk_rising && idle_time_over && idle_en) all_bit_shift_cnt <= 8'd0 ; else if (!cs && cs_reg && !idle_en) all_bit_shift_cnt <= 8'd0 ; else if (sclk_rising_r1 && (idle_en | ~cs_reg)) begin if (all_bit_shift_cnt == all_bit_num) all_bit_shift_cnt <= all_bit_shift_cnt ; else all_bit_shift_cnt <= all_bit_shift_cnt + 1; end end

这段代码是一个时钟上升沿触发的始终块,根据不同的条件更新`all_bit_shift_cnt`寄存器的值。 - 如果复位信号`rst`为高电平,将`all_bit_shift_cnt`重置为8位的0。 - 如果`sclk_rising`、`idle_time_over`和`idle_en`均为高电平,将`all_bit_shift_cnt`重置为8位的0。 - 如果`cs`信号为低电平,`cs_reg`信号为高电平,且`idle_en`为低电平,将`all_bit_shift_cnt`重置为8位的0。 - 如果`sclk_rising_r1`为高电平且(`idle_en`为高电平或者`cs_reg`为低电平),则根据以下逻辑更新`all_bit_shift_cnt`: - 如果`all_bit_shift_cnt`等于预设值`all_bit_num`,则保持原值不变。 - 否则,将`all_bit_shift_cnt`加1。 这段代码的作用是根据不同的条件来更新`all_bit_shift_cnt`寄存器的值。它用于实现对`all_bit_shift_cnt`进行计数和重置的逻辑。

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按句解释以下代码:module bus_handshake ( input clk, input rst, input [7:0] data_in, input valid_in, output [7:0] data_out, output reg ready_out, output reg valid_out ); reg [7:0] data_reg; reg valid_reg; always @(posedge clk or negedge rst) begin if (~rst) begin valid_reg <= #1'b0 1'b0; end else begin valid_reg <= #1'b0 valid_in; end end reg ready_reg; always @(posedge clk or negedge rst) begin if (~rst) begin ready_reg <= #1'b0 1'b0; end else begin ready_reg <= #1'b0 ready_out; end end localparam IDLE = 'd0, WAIT_VALID = 'd1, WAIT_READY = 'd2, DATA_TRANSFER = 'd3; reg [2:0] state; always @(posedge clk or negedge rst) begin if (~rst) begin state <= #1'b0 IDLE; valid_out <= #1'b0 1'b0; ready_out <= #1'b0 1'b0; end else begin case (state) IDLE: begin if (valid_reg) begin state <= #1'b0 WAIT_READY; valid_out <= #1'b0 1'b1; end else begin state <= #1'b0 IDLE; valid_out <= #1'b0 1'b0; end end WAIT_VALID: begin if (~valid_reg) begin state <= #1 WAIT_READY; end else if (ready_reg) begin state <= #3 DATA_TRANSFER; ready_out <= #1 1'b0; end else begin state <= #2 WAIT_VALID; end end WAIT_READY: begin if (~ready_reg) begin state <= #2 WAIT_VALID; end else if (valid_reg) begin state <= #3 DATA_TRANSFER; valid_out <= #2 1'b0; end else begin state <= #3 WAIT_READY; ready_out<=#2 1'b1; end end DATA_TRANSFER:begin data_reg<=#3 data_in; if(ready_reg && ~valid_reg) {state<=#4 IDLE; ready_out<=#3 1’b0;}else {state<=#3 DATA_TRANSFER; ready_out<=#3 1'b0;} end endcase end end assign data_out = state == DATA_TRANSFER ? data_reg : 'bz; endmodule

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

改写一下这段代码,使得寄存器地址支持16bit读写,现在这段是只支持8bit读写://FSM always @ (posedge clk or negedge rst) if (~rst) i2c_state<=3'b000;//idle else i2c_state<= next_i2c_state; //////////Modified on 25 november.write Address is 30H; Read Address is 31H///// always @(i2c_state or stopf or startf or cnt or sft or sadr or hf or scl_neg or cnt) case(i2c_state) 3'b000: //This state is the initial state,idle state begin if (startf)next_i2c_state<= 3 b001;//start else next_i2c_state <= i2c_state; end 3b001://This state is the device address detect & trigger begin if(stopf)next_i2c_state<=3'b000; else begin if((cnt==4'h9)&&({sft[0],hf} ==2'b00) && (scl_neg ==1'b1)&&(sadr ==sft[7:1])) next i2c_ state<=3'b010;//write: i2c adderss is 00110000 and ACK is sampled //so {sft[0],hf} is 2'b00 else if ((cnt==4'h9)&&({sft[0],hf} ==2'b10) && (scl_neg ==1'b1)&&(sadr ==sft[7:1])) next i2c_ state<=3'b011;//read:i2c adderss is 00110001 and ACK is sampled //so {sft[0],hf} is 2'b10 else if((cnt ==4'h9) && (scl_neg == 1'b1)) next_ i2c_state<=3 'b000;//when the address accepted does not match the SADR, //the state comes back else next_i2c_state<=i2c_state; end end 3'b010: //This state is the register address detect &&trigger begin if (stopf)next_i2c_state<=3'b000; else if (startf)next_i2c_state<=3'b001; else if ((cnt ==4'h9) && (scl_neg == 1'b1)) next_i2c _state<=3'b10 else next i2c_state<=i2c_state; end 3'b011: //This state is the register data read begin if (stopf)next_i2c _state<=3'b000; else if (startf) next_i2c _state<=3'b001; else next_12c_state<=i2c_state; end 3'b100: //This state is the register data write begin if (stopf)next_i2c _state<=3'b000; else if (startf) next_i2c _state<=3b001; else next_i2c_state<=i2c_state; end default://safe mode control next_i2c_state <= 3'b000; endcase

您好帮我用verilog改下一下这段状态机的代码,现在支持寄存器8bit读写,改写后使得支持寄存器16bit读写,分为高八位低八位,需要用代码加一段状态机还有高八位完了之后有一个ACK响应位: //FSM always @ (posedge clk or negedge rst) if (~rst) i2c_state<=3'b000;//idle else i2c_state<= next_i2c_state; //////////Modified on 25 november.write Address is 30H; Read Address is 31H///// always @(i2c_state or stopf or startf or cnt or sft or sadr or hf or scl_neg or cnt) case(i2c_state) 3'b000: //This state is the initial state,idle state begin if (startf)next_i2c_state<= 3 b001;//start else next_i2c_state <= i2c_state; end 3b001://This state is the device address detect & trigger begin if(stopf)next_i2c_state<=3'b000; else begin if((cnt==4'h9)&&({sft[0],hf} ==2'b00) && (scl_neg ==1'b1)&&(sadr ==sft[7:1])) next i2c_ state<=3'b010;//write: i2c adderss is 00110000 and ACK is sampled //so {sft[0],hf} is 2'b00 else if ((cnt==4'h9)&&({sft[0],hf} ==2'b10) && (scl_neg ==1'b1)&&(sadr ==sft[7:1])) next i2c_ state<=3'b011;//read:i2c adderss is 00110001 and ACK is sampled //so {sft[0],hf} is 2'b10 else if((cnt ==4'h9) && (scl_neg == 1'b1)) next_ i2c_state<=3 'b000;//when the address accepted does not match the SADR, //the state comes back else next_i2c_state<=i2c_state; end end 3'b010: //This state is the register address detect &&trigger begin if (stopf)next_i2c_state<=3'b000; else if (startf)next_i2c_state<=3'b001; else if ((cnt ==4'h9) && (scl_neg == 1'b1)) next_i2c _state<=3'b10 else next i2c_state<=i2c_state; end 3'b011: //This state is the register data read begin if (stopf)next_i2c _state<=3'b000; else if (startf) next_i2c _state<=3'b001; else next_12c_state<=i2c_state; end 3'b100: //This state is the register data write begin if (stopf)next_i2c _state<=3'b000; else if (startf) next_i2c _state<=3b001; else next_i2c_state<=i2c_state; end default://safe mode control next_i2c_state <= 3'b000; endcase

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