Remove usrp1 and usrp2 FPGA files. These are now hosted at:

[debian/gnuradio] / usrp2 / fpga / control_lib / ss_rcvr.v

diff --git a/usrp2/fpga/control_lib/ss_rcvr.v b/usrp2/fpga/control_lib/ss_rcvr.v
deleted file mode 100644 (file)
index 8e650d2..0000000
--- a/usrp2/fpga/control_lib/ss_rcvr.v
+++ /dev/null
@@ -1,81 +0,0 @@
-
-
-// Source-synchronous receiver
-// Assumes both clocks are at the same rate
-// Relative clock phase is
-//    unknown
-//    variable
-//    bounded
-// The output will come several cycles later than the input
-
-// This should synthesize efficiently in Xilinx distributed ram cells,
-//   which is why we use a buffer depth of 16
-
-// FIXME Async reset on rxclk side?
-
-module ss_rcvr
-  #(parameter WIDTH=16)
-    (input rxclk,
-     input sysclk,
-     input rst,
-     
-     input [WIDTH-1:0] data_in,
-     output [WIDTH-1:0] data_out,
-     output reg clock_present);
-   
-   wire [3:0] rd_addr, wr_addr;
-
-   // Distributed RAM
-   reg [WIDTH-1:0] buffer [0:15];
-   always @(posedge rxclk)
-     buffer[wr_addr] <= data_in;
-   
-   assign         data_out = buffer[rd_addr];
-   
-   // Write address generation
-   reg [3:0]      wr_counter;
-   always @(posedge rxclk or posedge rst)
-     if (rst)
-       wr_counter <= 0;
-     else
-       wr_counter <= wr_counter + 1;
-   
-   assign         wr_addr = {wr_counter[3], ^wr_counter[3:2], ^wr_counter[2:1], ^wr_counter[1:0]};
-   
-   // Read Address generation
-   wire [3:0]     wr_ctr_sys, diff, abs_diff;
-   reg [3:0]      wr_addr_sys_d1, wr_addr_sys_d2;
-   reg [3:0]      rd_counter;
-   
-   assign         rd_addr = {rd_counter[3], ^rd_counter[3:2], ^rd_counter[2:1], ^rd_counter[1:0]};
-   
-   always @(posedge sysclk)
-     wr_addr_sys_d1 <= wr_addr;
-   
-   always @(posedge sysclk)
-     wr_addr_sys_d2 <= wr_addr_sys_d1;
-   
-   assign         wr_ctr_sys = {wr_addr_sys_d2[3],^wr_addr_sys_d2[3:2],^wr_addr_sys_d2[3:1],^wr_addr_sys_d2[3:0]};
-   
-   assign         diff = wr_ctr_sys - rd_counter;
-   assign         abs_diff = diff[3] ? (~diff+1) : diff;
-   
-   always @(posedge sysclk)
-     if(rst)
-       begin
-         clock_present <= 0;
-         rd_counter <= 0;
-       end
-     else 
-       if(~clock_present)
-        if(abs_diff > 5)
-          clock_present <= 1;
-        else
-          ;
-       else
-        if(abs_diff<3)
-          clock_present <= 0;
-        else
-          rd_counter <= rd_counter + 1;
-
-endmodule // ss_rcvr