Synchronous FIFO Verilog Code

PayPal · 发表于 2020-7-4 20:14:31

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本帖最后由 PayPal 于 2020-7-4 20:16 编辑

经典FIFO代码，写的规范。

//-----------------------------------------------------
// Design Name : syn_fifo
// File Name : syn_fifo.v
// Function : Synchronous (single clock) FIFO
// Coder :<a href="http://www.asic-world.com/">http://www.asic-world.com/</a>
//-----------------------------------------------------
module syn_fifo (
clk , // Clock input
rst , // Active high reset
wr_cs , // Write chip select
rd_cs , // Read chipe select
data_in , // Data input
rd_en , // Read enable
wr_en , // Write Enable
data_out , // Data Output
empty , // FIFO empty
full // FIFO full
);
// FIFO constants
parameter DATA_WIDTH = 8;
parameter ADDR_WIDTH = 8;
parameter RAM_DEPTH = (1 << ADDR_WIDTH);
// Port Declarations
input clk ;
input rst ;
input wr_cs ;
input rd_cs ;
input rd_en ;
input wr_en ;
input [DATA_WIDTH-1:0] data_in ;
output full ;
output empty ;
output [DATA_WIDTH-1:0] data_out ;
//-----------Internal variables-------------------
reg [ADDR_WIDTH-1:0] wr_pointer;
reg [ADDR_WIDTH-1:0] rd_pointer;
reg [ADDR_WIDTH :0] status_cnt;
reg [DATA_WIDTH-1:0] data_out ;
wire [DATA_WIDTH-1:0] data_ram ;
//-----------Variable assignments---------------
assign full = (status_cnt == (RAM_DEPTH-1));
assign empty = (status_cnt == 0);
//-----------Code Start---------------------------
always @ (posedge clk or posedge rst)
begin : WRITE_POINTER
if (rst) begin
wr_pointer <= 0;
end else if (wr_cs && wr_en ) begin
wr_pointer <= wr_pointer + 1;
end
end
always @ (posedge clk or posedge rst)
begin : READ_POINTER
if (rst) begin
rd_pointer <= 0;
end else if (rd_cs && rd_en ) begin
rd_pointer <= rd_pointer + 1;
end
end
always @ (posedge clk or posedge rst)
begin : READ_DATA
if (rst) begin
data_out <= 0;
end else if (rd_cs && rd_en ) begin
data_out <= data_ram;
end
end
always @ (posedge clk or posedge rst)
begin : STATUS_COUNTER
if (rst) begin
status_cnt <= 0;
// Read but no write.
end else if ((rd_cs && rd_en) && !(wr_cs && wr_en)
&& (status_cnt != 0)) begin
status_cnt <= status_cnt - 1;
// Write but no read.
end else if ((wr_cs && wr_en) && !(rd_cs && rd_en)
&& (status_cnt != RAM_DEPTH)) begin
status_cnt <= status_cnt + 1;
end
end
ram_dp_ar_aw #(DATA_WIDTH,ADDR_WIDTH)DP_RAM (
.address_0 (wr_pointer) , // address_0 input
.data_0 (data_in) , // data_0 bi-directional
.cs_0 (wr_cs) , // chip select
.we_0 (wr_en) , // write enable
.oe_0 (1'b0) , // output enable
.address_1 (rd_pointer) , // address_q input
.data_1 (data_ram) , // data_1 bi-directional
.cs_1 (rd_cs) , // chip select
.we_1 (1'b0) , // Read enable
.oe_1 (rd_en) // output enable
);
endmodule

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willtuna · 发表于 2020-7-8 13:55:30

Thanks for sharing, good template form asic-word .com

[转贴] Synchronous FIFO Verilog Code

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