tinyriscv/rtl/utils/gen_dff.sv

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/*
Copyright 2020 Blue Liang, liangkangnan@163.com
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
// 带默认值和控制信号的流水线触发器
module gen_pipe_dff #(
parameter DW = 32)(
input wire clk,
input wire rst_n,
input wire hold_en,
input wire[DW-1:0] def_val,
input wire[DW-1:0] din,
output wire[DW-1:0] qout
);
reg[DW-1:0] qout_r;
always @ (posedge clk or negedge rst_n) begin
if (!rst_n | hold_en) begin
qout_r <= def_val;
end else begin
qout_r <= din;
end
end
assign qout = qout_r;
endmodule
// 复位后输出为0的触发器
module gen_rst_0_dff #(
parameter DW = 32)(
input wire clk,
input wire rst_n,
input wire[DW-1:0] din,
output wire[DW-1:0] qout
);
reg[DW-1:0] qout_r;
always @ (posedge clk or negedge rst_n) begin
if (!rst_n) begin
qout_r <= {DW{1'b0}};
end else begin
qout_r <= din;
end
end
assign qout = qout_r;
endmodule
// 复位后输出为1的触发器
module gen_rst_1_dff #(
parameter DW = 32)(
input wire clk,
input wire rst_n,
input wire[DW-1:0] din,
output wire[DW-1:0] qout
);
reg[DW-1:0] qout_r;
always @ (posedge clk or negedge rst_n) begin
if (!rst_n) begin
qout_r <= {DW{1'b1}};
end else begin
qout_r <= din;
end
end
assign qout = qout_r;
endmodule
// 复位后输出为默认值的触发器
module gen_rst_def_dff #(
parameter DW = 32)(
input wire clk,
input wire rst_n,
input wire[DW-1:0] def_val,
input wire[DW-1:0] din,
output wire[DW-1:0] qout
);
reg[DW-1:0] qout_r;
always @ (posedge clk or negedge rst_n) begin
if (!rst_n) begin
qout_r <= def_val;
end else begin
qout_r <= din;
end
end
assign qout = qout_r;
endmodule
// 带使能端、复位后输出为0的触发器
module gen_en_dff #(
parameter DW = 32)(
input wire clk,
input wire rst_n,
input wire en,
input wire[DW-1:0] din,
output wire[DW-1:0] qout
);
reg[DW-1:0] qout_r;
always @ (posedge clk or negedge rst_n) begin
if (!rst_n) begin
qout_r <= {DW{1'b0}};
end else if (en == 1'b1) begin
qout_r <= din;
end
end
assign qout = qout_r;
endmodule
// 带使能端、没有复位的触发器
module gen_en_dffnr #(
parameter DW = 32)(
input wire clk,
input wire en,
input wire[DW-1:0] din,
output wire[DW-1:0] qout
);
reg[DW-1:0] qout_r;
always @ (posedge clk) begin
if (en == 1'b1) begin
qout_r <= din;
end
end
assign qout = qout_r;
endmodule