URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Go to most recent revision |
Show entire file |
Details |
Blame |
View Log
| Rev 360 |
Rev 363 |
| Line 190... |
Line 190... |
reg [fifo_pointer_w-1:0] bottom;
|
reg [fifo_pointer_w-1:0] bottom;
|
|
|
reg [fifo_counter_w-1:0] count;
|
reg [fifo_counter_w-1:0] count;
|
reg overrun;
|
reg overrun;
|
|
|
wire [fifo_pointer_w-1:0] top_plus_1 = top + 1'b1;
|
wire [fifo_pointer_w-1:0] top_plus_1 = top + 4'h1;
|
|
|
raminfr #(fifo_pointer_w,8,fifo_depth) rfifo
|
raminfr #(fifo_pointer_w,8,fifo_depth) rfifo
|
(.clk(clk),
|
(.clk(clk),
|
.we(push),
|
.we(push),
|
.a(top),
|
.a(top),
|
| Line 206... |
Line 206... |
always @(posedge clk or posedge wb_rst_i) // synchronous FIFO
|
always @(posedge clk or posedge wb_rst_i) // synchronous FIFO
|
begin
|
begin
|
if (wb_rst_i)
|
if (wb_rst_i)
|
begin
|
begin
|
top <= 0;
|
top <= 0;
|
bottom <= 1'b0;
|
bottom <= 0;
|
count <= 0;
|
count <= 0;
|
fifo[0] <= 0;
|
fifo[0] <= 0;
|
fifo[1] <= 0;
|
fifo[1] <= 0;
|
fifo[2] <= 0;
|
fifo[2] <= 0;
|
fifo[3] <= 0;
|
fifo[3] <= 0;
|
| Line 228... |
Line 228... |
fifo[15] <= 0;
|
fifo[15] <= 0;
|
end
|
end
|
else
|
else
|
if (fifo_reset) begin
|
if (fifo_reset) begin
|
top <= 0;
|
top <= 0;
|
bottom <= 1'b0;
|
bottom <= 0;
|
count <= 0;
|
count <= 0;
|
fifo[0] <= 0;
|
fifo[0] <= 0;
|
fifo[1] <= 0;
|
fifo[1] <= 0;
|
fifo[2] <= 0;
|
fifo[2] <= 0;
|
fifo[3] <= 0;
|
fifo[3] <= 0;
|
| Line 254... |
Line 254... |
case ({push, pop})
|
case ({push, pop})
|
2'b10 : if (count<fifo_depth) // overrun condition
|
2'b10 : if (count<fifo_depth) // overrun condition
|
begin
|
begin
|
top <= top_plus_1;
|
top <= top_plus_1;
|
fifo[top] <= data_in[2:0];
|
fifo[top] <= data_in[2:0];
|
count <= count + 1'b1;
|
count <= count + 5'd1;
|
end
|
end
|
2'b01 : if(count>0)
|
2'b01 : if(count>0)
|
begin
|
begin
|
fifo[bottom] <= 0;
|
fifo[bottom] <= 0;
|
bottom <= bottom + 1'b1;
|
bottom <= bottom + 4'd1;
|
count <= count - 1'b1;
|
count <= count - 5'd1;
|
end
|
end
|
2'b11 : begin
|
2'b11 : begin
|
bottom <= bottom + 1'b1;
|
bottom <= bottom + 4'd1;
|
top <= top_plus_1;
|
top <= top_plus_1;
|
fifo[top] <= data_in[2:0];
|
fifo[top] <= data_in[2:0];
|
end
|
end
|
default: ;
|
default: ;
|
endcase
|
endcase
|
© copyright 1999-2024
OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.