new fifos copied over from other project

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10709 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 58 insertions, 0 deletions

diff --git a/control_lib/newfifo/fifo18_to_ll8.v b/control_lib/newfifo/fifo18_to_ll8.v
new file mode 100644
index 000000000..4653244ef
--- /dev/null
+++ b/control_lib/newfifo/fifo18_to_ll8.v
@@ -0,0 +1,58 @@
+
+module fifo18_to_ll8
+  (input clk, input reset, input clear,
+   input [35:0] f18_data,
+   input f18_src_rdy_i,
+   output f18_dst_rdy_o,
+
+   output reg [7:0] ll_data,
+   output ll_sof_n,
+   output ll_eof_n,
+   output ll_src_rdy_n,
+   input ll_dst_rdy_n);
+
+   wire  ll_sof, ll_eof, ll_src_rdy;
+   assign ll_sof_n = ~ll_sof;
+   assign ll_eof_n = ~ll_eof;
+   assign ll_src_rdy_n = ~ll_src_rdy;
+   wire ll_dst_rdy = ~ll_dst_rdy_n;
+
+   wire   f18_sof = f18_data[32];
+   wire   f18_eof = f18_data[33];
+   wire   f18_occ = f18_data[35:34];
+   wire advance, end_early;
+   reg [1:0] state;
+   assign debug    = {29'b0,state};
+
+   always @(posedge clk)
+     if(reset)
+       state 	  <= 0;
+     else
+       if(advance)
+	 if(ll_eof)
+	   state  <= 0;
+	 else
+	   state  <= state + 1;
+
+   always @*
+     case(state)
+       0 : ll_data = f18_data[31:24];
+       1 : ll_data = f18_data[23:16];
+       2 : ll_data = f18_data[15:8];
+       3 : ll_data = f18_data[7:0];
+       default : ll_data = f18_data[31:24];
+       endcase // case (state)
+   
+   assign ll_sof 	 = (state==0) & f18_sof;
+   assign ll_eof 	 = f18_eof & (((state==0)&(f18_occ==1)) |
+			       ((state==1)&(f18_occ==2)) |
+			       ((state==2)&(f18_occ==3)) |
+			       (state==3));
+   
+   assign ll_src_rdy 	 = f18_src_rdy_i;
+
+   assign advance 	 = ll_src_rdy & ll_dst_rdy;
+   assign f18_dst_rdy_o  = advance & ((state==3)|ll_eof);
+   assign debug 	 = state;
+   
+endmodule // ll8_to_fifo36