?? fifo_control.v
字號:
/**************************************************
函數名:fifo_control
功 能:實現(xiàn)對fifo的控制
參 數:
**************************************************/
module fifo_control(enable,
clk,
ram1_ren,
ram2_ren,
data_in,
data_out,
fifo_wen,
rdaddress
);
parameter wd=32;
input enable,ram1_ren,ram2_ren,clk;
input [wd-1:0]data_in;
output fifo_wen;
output [wd-1:0]data_out;
output [3:0]rdaddress;
reg [4:0]address;
reg fifo_wen,fifo_wen_temp,fifo_ren,flag;
assign rdaddress=address[3:0];
assign data_out=data_in;
always @(posedge clk)
fifo_wen<=fifo_wen_temp;
always @(posedge clk)
begin
if(!enable)
begin
fifo_wen_temp<=1'b1;
fifo_ren<=1'b1;
address<=5'b0;
flag<=1'b0;
end
else
begin
fifo_ren<=1'b1;
case({ram1_ren,ram2_ren})
2'b10: if(address<16 && flag==1'b0)
begin
address<=address+5'b00001;
fifo_wen_temp<=1'b0;
end
else
begin
flag<=1'b1;
fifo_wen_temp<=1'b1;
address<=5'b0;
end
2'b01: if(address<16 && flag==1'b1)
begin
address<=address+5'b00001;
fifo_wen_temp<=1'b0;
end
else
begin
flag<=1'b0;
fifo_wen_temp<=1'b1;
address<=5'b0;
end
default:begin
fifo_wen_temp<=1'b1;
fifo_ren<=1'b1;
address<=5'b0;
end
endcase
end
end
endmodule
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