diff options
Diffstat (limited to 'usrp2/fpga/control_lib/newfifo/fifo_2clock.v')
| -rw-r--r-- | usrp2/fpga/control_lib/newfifo/fifo_2clock.v | 61 |
1 files changed, 56 insertions, 5 deletions
diff --git a/usrp2/fpga/control_lib/newfifo/fifo_2clock.v b/usrp2/fpga/control_lib/newfifo/fifo_2clock.v index 6b1eb607e..07ae090f2 100644 --- a/usrp2/fpga/control_lib/newfifo/fifo_2clock.v +++ b/usrp2/fpga/control_lib/newfifo/fifo_2clock.v @@ -1,9 +1,58 @@ +// FIXME ignores the AWIDTH (fifo size) parameter + module fifo_2clock - #(parameter DWIDTH=32, AWIDTH=9) - (input wclk, input [DWIDTH-1:0] datain, input write, output full, output reg [AWIDTH-1:0] level_wclk, - input rclk, output [DWIDTH-1:0] dataout, input read, output empty, output reg [AWIDTH-1:0] level_rclk, - input arst); + #(parameter WIDTH=36, SIZE=6) + (input wclk, input [WIDTH-1:0] datain, input src_rdy_i, output dst_rdy_o, output [15:0] space, + input rclk, output [WIDTH-1:0] dataout, output src_rdy_o, input dst_rdy_i, output [15:0] occupied, + input arst); + + wire [SIZE:0] level_rclk, level_wclk; // xilinx adds an extra bit if you ask for accurate levels + wire full, empty, write, read; + + assign dst_rdy_o = ~full; + assign src_rdy_o = ~empty; + assign write = src_rdy_i & dst_rdy_o; + assign read = src_rdy_o & dst_rdy_i; + + generate + if(WIDTH==36) + if(SIZE==9) + fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk + (.rst(rst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else if(SIZE==11) + fifo_xlnx_2Kx36_2clk fifo_xlnx_2Kx36_2clk + (.rst(rst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else if(SIZE==6) + fifo_xlnx_64x36_2clk fifo_xlnx_64x36_2clk + (.rst(rst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else + fifo_xlnx_512x36_2clk fifo_xlnx_512x36_2clk + (.rst(rst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + else if((WIDTH==19)|(WIDTH==18)) + if(SIZE==4) + fifo_xlnx_16x19_2clk fifo_xlnx_16x19_2clk + (.rst(rst), + .wr_clk(wclk),.din(datain),.full(full),.wr_en(write),.wr_data_count(level_wclk), + .rd_clk(rclk),.dout(dataout),.empty(empty),.rd_en(read),.rd_data_count(level_rclk) ); + endgenerate + + assign occupied = {{(16-SIZE-1){1'b0}},level_rclk}; + assign space = ((1<<SIZE)+1)-level_wclk; + +endmodule // fifo_2clock + +/* +`else + // ISE sucks, so the following doesn't work properly reg [AWIDTH-1:0] wr_addr, rd_addr; wire [AWIDTH-1:0] wr_addr_rclk, rd_addr_wclk; @@ -62,5 +111,7 @@ module fifo_2clock level_wclk <= wr_addr - rd_addr_wclk; always @(posedge rclk) level_rclk <= wr_addr_rclk - rd_addr; - +`endif endmodule // fifo_2clock + +*/ |