Merged SVN matt/new_eth r10782:11633 into new_eth

[debian/gnuradio] / usrp2 / fpga / control_lib / newfifo / fifo_2clock.v

diff --git a/usrp2/fpga/control_lib/newfifo/fifo_2clock.v b/usrp2/fpga/control_lib/newfifo/fifo_2clock.v
index 6b1eb607edafebafafceb90d713a01983420af41..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 100644 (file)
--- a/usrp2/fpga/control_lib/newfifo/fifo_2clock.v
+++ b/usrp2/fpga/control_lib/newfifo/fifo_2clock.v
@@ -1,66 +0,0 @@
-
-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);
-
-   reg [AWIDTH-1:0] wr_addr, rd_addr;
-   wire [AWIDTH-1:0] wr_addr_rclk, rd_addr_wclk;
-   wire [AWIDTH-1:0] next_rd_addr;
-   wire            enb_read;
-   
-   // Write side management
-   wire [AWIDTH-1:0] next_wr_addr = wr_addr + 1;
-   always @(posedge wclk or posedge arst)
-     if(arst)
-       wr_addr <= 0;
-     else if(write)
-       wr_addr <= next_wr_addr;
-   assign          full = (next_wr_addr == rd_addr_wclk);
-
-   //  RAM for data storage.  Data out is registered, complicating the
-   //     read side logic
-   ram_2port #(.DWIDTH(DWIDTH),.AWIDTH(AWIDTH)) mac_rx_ff_ram
-     (.clka(wclk),.ena(1'b1),.wea(write),.addra(wr_addr),.dia(datain),.doa(),
-      .clkb(rclk),.enb(enb_read),.web(1'b0),.addrb(next_rd_addr),.dib(0),.dob(dataout) );
-
-   // Read side management
-   reg                     data_valid;
-   assign          empty = ~data_valid;
-   assign          next_rd_addr = rd_addr + data_valid;
-   assign          enb_read = read | ~data_valid;
-
-   always @(posedge rclk or posedge arst)
-     if(arst)
-       rd_addr <= 0;
-     else if(read)
-       rd_addr <= rd_addr + 1;
-
-   always @(posedge rclk or posedge arst)
-     if(arst)
-       data_valid <= 0;
-     else
-       if(read & (next_rd_addr == wr_addr_rclk))
-        data_valid <= 0;
-       else if(next_rd_addr != wr_addr_rclk)
-        data_valid <= 1;
-        
-   // Send pointers across clock domains via gray code
-   gray_send #(.WIDTH(AWIDTH)) send_wr_addr
-     (.clk_in(wclk),.addr_in(wr_addr),
-      .clk_out(rclk),.addr_out(wr_addr_rclk) );
-   
-   gray_send #(.WIDTH(AWIDTH)) send_rd_addr
-     (.clk_in(rclk),.addr_in(rd_addr),
-      .clk_out(wclk),.addr_out(rd_addr_wclk) );
-
-   // Generate fullness info, these are approximate and may be delayed 
-   // and are only for higher-level flow control.  
-   // Only full and empty are guaranteed exact.
-   always @(posedge wclk) 
-     level_wclk <= wr_addr - rd_addr_wclk;
-   always @(posedge rclk) 
-     level_rclk <= wr_addr_rclk - rd_addr;
-   
-endmodule // fifo_2clock