moved into subdir

21 files changed, 7528 insertions, 0 deletions

diff --git a/usrp2/control_lib/newfifo/.gitignore b/usrp2/control_lib/newfifo/.gitignore
new file mode 100644
index 000000000..cba7efc8e
--- /dev/null
+++ b/usrp2/control_lib/newfifo/.gitignore
@@ -0,0 +1 @@
+a.out
diff --git a/usrp2/control_lib/newfifo/buffer_int.v b/usrp2/control_lib/newfifo/buffer_int.v
new file mode 100644
index 000000000..b45ed3532
--- /dev/null
+++ b/usrp2/control_lib/newfifo/buffer_int.v
@@ -0,0 +1,168 @@
+
+// FIFO Interface to the 2K buffer RAMs
+// Read port is read-acknowledge
+// FIXME do we want to be able to interleave reads and writes?
+
+module buffer_int
+  #(parameter BUF_NUM = 0,
+    parameter BUF_SIZE = 9)
+    (// Control Interface
+     input clk,
+     input rst,
+     input [31:0] ctrl_word,
+     input go,
+     output done,
+     output error,
+     output idle,
+     output [1:0] flag,
+     
+     // Buffer Interface
+     output en_o,
+     output we_o,
+     output reg [BUF_SIZE-1:0] addr_o,
+     output [31:0] dat_to_buf,
+     input [31:0] dat_from_buf,
+     
+     // Write FIFO Interface
+     input [31:0] wr_data_i,
+     input [3:0] wr_flags_i,
+     input wr_ready_i,
+     output wr_ready_o,
+     
+     // Read FIFO Interface
+     output [31:0] rd_data_o,
+     output [3:0] rd_flags_o,
+     output rd_ready_o,
+     input rd_ready_i
+     );
+   
+   reg [31:0] ctrl_reg;
+   reg 	      go_reg;
+   
+   always @(posedge clk)
+     go_reg <= go;
+   
+   always @(posedge clk)
+     if(rst)
+       ctrl_reg <= 0;
+     else
+       if(go & (ctrl_word[31:28] == BUF_NUM))
+	 ctrl_reg <= ctrl_word;
+   
+   wire [BUF_SIZE-1:0] firstline = ctrl_reg[BUF_SIZE-1:0];
+   wire [BUF_SIZE-1:0] lastline = ctrl_reg[2*BUF_SIZE-1:BUF_SIZE];
+
+   wire       read = ctrl_reg[22];
+   wire       write = ctrl_reg[23];
+   wire       clear = ctrl_reg[24];
+   //wire [2:0] port = ctrl_reg[27:25];  // Ignored in this block
+   //wire [3:0] buff_num = ctrl_reg[31:28];  // Ignored here ?
+   
+   localparam IDLE = 3'd0;
+   localparam PRE_READ = 3'd1;
+   localparam READING = 3'd2;
+   localparam WRITING = 3'd3;
+   localparam ERROR = 3'd4;
+   localparam DONE = 3'd5;
+   
+   reg [2:0]  state;
+   reg 	      rd_sop, rd_eop;
+   wire       wr_sop, wr_eop, wr_error;
+   reg [1:0]  rd_occ;
+   wire [1:0] wr_occ;
+   
+   always @(posedge clk)
+     if(rst)
+       begin
+	  state <= IDLE;
+	  rd_sop <= 0;
+	  rd_eop <= 0;
+	  rd_occ <= 0;
+       end
+     else
+       if(clear)
+	 begin
+	    state <= IDLE;
+	    rd_sop <= 0;
+	    rd_eop <= 0;
+	    rd_occ <= 0;
+	 end
+       else 
+	 case(state)
+	   IDLE :
+	     if(go_reg & read)
+	       begin
+		  addr_o <= firstline;
+		  state <= PRE_READ;
+	       end
+	     else if(go_reg & write)
+	       begin
+		  addr_o <= firstline;
+		  state <= WRITING;
+	       end
+	   
+	   PRE_READ :
+	     begin
+		state <= READING;
+		addr_o <= addr_o + 1;
+		rd_occ <= 2'b00;
+		rd_sop <= 1;
+		rd_eop <= 0;
+	     end
+	   
+	   READING :
+	     if(rd_ready_i)
+	       begin
+		  rd_sop <= 0;
+		  addr_o <= addr_o + 1;
+		  if(addr_o == lastline)
+		    begin
+		       rd_eop <= 1;
+		       // FIXME assign occ here
+		       rd_occ <= 0;
+		    end
+		  else
+		    rd_eop <= 0;
+		  if(rd_eop)
+		    state <= DONE;
+	       end
+	   
+	   WRITING :
+	     begin
+		if(wr_ready_i)
+		  begin
+		     addr_o <= addr_o + 1;
+		     if(wr_error)
+		       begin
+			  state <= ERROR;
+			  // Save OCC flags here
+		       end
+		     else if((addr_o == lastline)||wr_eop)
+		       state <= DONE;
+		  end // if (wr_ready_i)
+	     end // case: WRITING
+	   
+	 endcase // case(state)
+   
+   assign     dat_to_buf = wr_data_i;
+   assign     rd_data_o = dat_from_buf;
+
+   assign     rd_flags_o = { rd_occ[1:0], rd_eop, rd_sop };
+   assign     rd_ready_o = (state == READING);
+   
+   assign     wr_sop = wr_flags_i[0];
+   assign     wr_eop = wr_flags_i[1];
+   assign     wr_occ = wr_flags_i[3:2];
+   assign     wr_error = wr_sop & wr_eop;
+   assign     wr_ready_o = (state == WRITING);
+
+   assign     we_o = (state == WRITING);
+   //assign     we_o = (state == WRITING) && wr_ready_i;  // always write to avoid timing issue
+
+   assign     en_o = ~((state==READING)& ~rd_ready_i);   // FIXME potential critical path
+   
+   assign     done = (state == DONE);
+   assign     error = (state == ERROR);
+   assign     idle = (state == IDLE);
+
+endmodule // buffer_int
diff --git a/usrp2/control_lib/newfifo/buffer_int_tb.v b/usrp2/control_lib/newfifo/buffer_int_tb.v
new file mode 100644
index 000000000..df54dcc0b
--- /dev/null
+++ b/usrp2/control_lib/newfifo/buffer_int_tb.v
@@ -0,0 +1,418 @@
+
+module buffer_int_tb ();
+
+   reg clk = 0;
+   reg rst = 1;
+
+   initial #100 rst = 0;
+   always #5 clk = ~clk;
+
+   wire en, we;
+   wire [8:0] addr;
+   wire [31:0] fifo2buf, buf2fifo;
+   
+   wire [31:0] rd_data_o;
+   wire [3:0]  rd_flags_o;
+   wire        rd_sop_o, rd_eop_o;
+   reg 	       rd_error_i = 0, rd_read_i = 0;
+   
+   reg [31:0]  wr_data_i = 0;
+   wire [3:0]  wr_flags_i;
+   reg 	       wr_eop_i = 0, wr_sop_i = 0;
+   reg 	       wr_write_i = 0;
+   wire        wr_ready_o, wr_full_o;
+   
+   reg 	       clear = 0, write = 0, read = 0;
+   reg [8:0]   firstline = 0, lastline = 0;
+   wire [3:0]  step = 1;
+   wire [31:0] ctrl_word = {4'b0,3'b0,clear,write,read,step,lastline,firstline};
+   reg 	       go = 0;
+   wire        done, error;
+
+   assign      wr_flags_i = {2'b00, wr_eop_i, wr_sop_i};
+   assign      rd_sop_o = rd_flags_o[0];
+   assign      rd_eop_o = rd_flags_o[1];
+   
+   buffer_int buffer_int
+     (.clk(clk),.rst(rst),
+      .ctrl_word(ctrl_word),.go(go),
+      .done(done),.error(error),
+      
+      // Buffer Interface
+      .en_o(en),.we_o(we),.addr_o(addr),
+      .dat_to_buf(fifo2buf),.dat_from_buf(buf2fifo),
+
+      // Write FIFO Interface
+      .wr_data_i(wr_data_i), .wr_flags_i(wr_flags_i), .wr_write_i(wr_write_i), .wr_ready_o(wr_ready_o),
+
+      // Read FIFO Interface
+      .rd_data_o(rd_data_o), .rd_flags_o(rd_flags_o), .rd_ready_o(rd_ready_o), .rd_read_i(rd_read_i)
+      );
+   
+   reg 	       ram_en = 0, ram_we = 0;
+   reg [8:0]   ram_addr = 0;
+   reg [31:0]  ram_data = 0;
+   
+   ram_2port #(.DWIDTH(32),.AWIDTH(9)) ram_2port
+     (.clka(clk), .ena(ram_en), .wea(ram_we), .addra(ram_addr), .dia(ram_data), .doa(),
+      .clkb(clk), .enb(en), .web(we), .addrb(addr), .dib(fifo2buf), .dob(buf2fifo) );
+   
+   initial
+     begin
+	@(negedge rst);
+	@(posedge clk);
+	FillRAM;
+
+	ResetBuffer;
+	SetBufferRead(5,10);
+	$display("Testing full read, no wait states.");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(6,0);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferRead(5,10);
+	$display("Testing full read, 2 wait states.");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(6,2);
+	repeat (10)
+	  @(posedge clk);
+
+	ResetBuffer;
+	SetBufferRead(5,10);
+	$display("Testing partial read, 0 wait states, then nothing after last.");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(3,0);
+	repeat (10)
+	  @(posedge clk);
+
+	ResetBuffer;
+	SetBufferRead(5,10);
+	$display("Testing partial read, 0 wait states, then done at same time as last.");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(2,0);
+	ReadALine;
+	repeat (10)
+	  @(posedge clk);
+
+	ResetBuffer;
+	SetBufferRead(5,10);
+	$display("Testing partial read, 3 wait states, then error at same time as last.");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(2,3);
+	rd_error_i <= 1;
+	ReadALine;
+	rd_error_i <= 0;
+	repeat (10)
+	  @(posedge clk);
+
+	ResetBuffer;
+	SetBufferRead(500,511);
+	$display("Testing full read, to the end of the buffer.");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(12,0);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferRead(0,511);
+	$display("Testing full read, start to end of the buffer.");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(512,0);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferRead(505,3);
+	$display("Testing full read, wraparound");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(11,0);
+	repeat (10)
+	  @(posedge clk);
+
+	ResetBuffer;
+	SetBufferWrite(10,15);
+	$display("Testing Full Write, no wait states");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	WriteLines(6,0,72);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferWrite(18,23);
+	$display("Testing Full Write, 1 wait states");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	WriteLines(6,1,101);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferWrite(27,40);
+	$display("Testing Partial Write, 0 wait states");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	WriteLines(6,0,201);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferWrite(45,200);
+	$display("Testing Partial Write, 0 wait states, then done and write simultaneously");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	wr_sop_i <= 1; wr_eop_i <= 0;
+	WriteLines(6,0,301);
+	wr_sop_i <= 0; wr_eop_i <= 1;
+	WriteALine(400);
+	wr_sop_i <= 0; wr_eop_i <= 0;
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferWrite(55,200);
+	$display("Testing Partial Write, 0 wait states, then error");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	WriteLines(6,0,501);
+	wr_sop_i <= 1; wr_eop_i <= 1;
+	WriteALine(400);
+	@(posedge clk);
+	repeat (10)
+	  @(posedge clk);
+	wr_sop_i <= 0; wr_eop_i <= 0;
+	
+	ResetBuffer;
+	SetBufferRead(0,82);
+	$display("Testing read after all the writes");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(83,0);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferWrite(508,4);
+	$display("Testing wraparound write");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	WriteLines(9,0,601);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferRead(506,10);
+	$display("Reading wraparound write");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(17,0);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferWrite(0,511);
+	$display("Testing Whole Buffer write");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	WriteLines(512,0,1000);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferRead(0,511);
+	$display("Reading Whole Buffer write");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(512,0);
+	repeat (10)
+	  @(posedge clk);
+
+	/*
+	ResetBuffer;
+	SetBufferWrite(5,10);
+	$display("Testing Write Too Many");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	WriteLines(12,0,2000);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferRead(0,15);
+	$display("Reading back Write Too Many");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(16,0);
+	repeat (10)
+	  @(posedge clk);
+	*/
+	ResetBuffer;
+	SetBufferWrite(15,20);
+	$display("Testing Write One Less Than Full");
+	while(!wr_ready_o)
+	  @(posedge clk);
+	wr_sop_i <= 1; wr_eop_i <= 0;
+	WriteALine(400);
+	wr_sop_i <= 0; wr_eop_i <= 0;
+	WriteLines(3,0,2000);
+	wr_sop_i <= 0; wr_eop_i <= 1;
+	WriteALine(400);
+	wr_sop_i <= 0; wr_eop_i <= 0;
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	SetBufferRead(13,22);
+	$display("Reading back Write One Less Than Full");
+	while(!rd_sop_o)
+	  @(posedge clk);
+	ReadLines(10,0);
+	repeat (10)
+	  @(posedge clk);
+	
+	ResetBuffer;
+	repeat(100)
+	  @(posedge clk);
+	$finish;
+     end
+   
+   always @(posedge clk)
+     if(rd_read_i == 1'd1)
+       $display("READ Buffer %d, rd_sop_o %d, rd_eop_o %d", rd_data_o, rd_sop_o, rd_eop_o);
+
+   always @(posedge clk)
+     if(wr_write_i == 1'd1)
+       $display("WRITE Buffer %d,  wr_ready_o %d, wr_full_o %d", wr_data_i, wr_ready_o, wr_full_o);
+	   
+   initial begin
+      $dumpfile("buffer_int_tb.lxt");
+      $dumpvars(0,buffer_int_tb);
+   end
+
+   task FillRAM;
+      begin
+	 ram_addr <= 0;
+	 ram_data <= 0;
+	 @(posedge clk);
+	 ram_en <= 1;
+	 ram_we <= 1;
+	 @(posedge clk);
+	 repeat (511)
+	   begin
+	      ram_addr <= ram_addr + 1;
+	      ram_data <= ram_data + 1;
+	      ram_en <= 1;
+	      ram_we <= 1;
+	      @(posedge clk);
+	   end
+	 ram_en <= 0;
+	 ram_we <= 0;
+	 @(posedge clk);
+	 $display("Filled the RAM");
+      end
+   endtask // FillRAM
+
+   task ResetBuffer;
+      begin
+	 clear <= 1; read <= 0; write <= 0;
+	 go <= 1;
+	 @(posedge clk);
+	 go <= 0;
+	 @(posedge clk);
+	 $display("Buffer Reset");
+      end
+   endtask // ClearBuffer
+   
+   task SetBufferWrite;
+      input [8:0] start;
+      input [8:0] stop;
+      begin
+	 clear <= 0; read <= 0; write <= 1;
+	 firstline <= start;
+	 lastline <= stop;
+	 go <= 1;
+	 @(posedge clk);
+	 go <= 0;
+	 @(posedge clk);
+	 $display("Buffer Set for Write");
+      end
+   endtask // SetBufferWrite
+   
+   task SetBufferRead;
+      input [8:0] start;
+      input [8:0] stop;
+      begin
+	 clear <= 0; read <= 1; write <= 0;
+	 firstline <= start;
+	 lastline <= stop;
+	 go <= 1;
+	 @(posedge clk);
+	 go <= 0;
+	 @(posedge clk);
+	 $display("Buffer Set for Read");
+      end
+   endtask // SetBufferRead
+
+   task ReadALine;
+      begin
+	 while(~rd_ready_o)
+	   @(posedge clk);
+	 #1 rd_read_i <= 1;
+	 @(posedge clk);
+	 rd_read_i <= 0;
+      end
+   endtask // ReadALine
+
+   task ReadLines;
+      input [9:0] lines;
+      input [7:0] wait_states;
+      begin
+	 $display("Read Lines: Number %d, Wait States %d",lines,wait_states);
+	 repeat (lines)
+	   begin
+	      ReadALine;
+	      repeat (wait_states)
+		@(posedge clk);
+	   end
+      end
+   endtask // ReadLines
+   
+   task WriteALine;
+      input [31:0] value;
+      begin
+	 while(~wr_ready_o)
+	   @(posedge clk);
+	 #1 wr_write_i <= 1;
+	 wr_data_i <= value;
+	 @(posedge clk);
+	 wr_write_i <= 0;
+      end
+   endtask // WriteALine
+   
+   task WriteLines;
+      input [9:0] lines;
+      input [7:0] wait_states;
+      input [31:0] value;
+      begin
+	 $display("Write Lines: Number %d, Wait States %d",lines,wait_states);
+	 repeat(lines)
+	   begin
+	      value <= value + 1;
+	      WriteALine(value);
+	      repeat(wait_states)
+		@(posedge clk);
+	   end
+      end
+   endtask // WriteLines
+   
+endmodule // buffer_int_tb
diff --git a/usrp2/control_lib/newfifo/buffer_pool.v b/usrp2/control_lib/newfifo/buffer_pool.v
new file mode 100644
index 000000000..41ac1deb3
--- /dev/null
+++ b/usrp2/control_lib/newfifo/buffer_pool.v
@@ -0,0 +1,283 @@
+
+// Buffer pool.  Contains 8 buffers, each 2K (512 by 32).  Each buffer
+// is a dual-ported RAM.  Port A on each of them is indirectly connected 
+// to the wishbone bus by a bridge.  Port B may be connected any one of the
+// 8 (4 rd, 4 wr) FIFO-like streaming interaces, or disconnected.  The wishbone bus
+// provides access to all 8 buffers, and also controls the connections
+// between the ports and the buffers, allocating them as needed.
+
+// wb_adr is 16 bits -- 
+//  bits 13:11 select which buffer
+//  bits 10:2 select line in buffer
+//  bits 1:0 are unused (32-bit access only)
+
+// BUF_SIZE is in address lines (i.e. log2 of number of lines).  
+// For S3 it should be 9 (512 words, 2KB)
+// For V5 it should be at least 10 (1024 words, 4KB) or 11 (2048 words, 8KB)
+
+module buffer_pool
+  #(parameter BUF_SIZE = 9,
+    parameter SET_ADDR = 64)
+    (input wb_clk_i,
+     input wb_rst_i,
+     input wb_we_i,
+     input wb_stb_i,
+     input [15:0] wb_adr_i,
+     input [31:0] wb_dat_i,   
+     output [31:0] wb_dat_o,
+     output reg wb_ack_o,
+     output wb_err_o,
+     output wb_rty_o,
+   
+     input stream_clk,
+     input stream_rst,
+     
+     input set_stb, input [7:0] set_addr, input [31:0] set_data,
+     output [31:0] status,
+     output sys_int_o,
+     
+     output [31:0] s0, output [31:0] s1, output [31:0] s2, output [31:0] s3,
+     output [31:0] s4, output [31:0] s5, output [31:0] s6, output [31:0] s7,
+     
+     // Write Interfaces
+     input [31:0] wr0_data_i, input [3:0] wr0_flags_i, input wr0_ready_i, output wr0_ready_o,
+     input [31:0] wr1_data_i, input [3:0] wr1_flags_i, input wr1_ready_i, output wr1_ready_o,
+     input [31:0] wr2_data_i, input [3:0] wr2_flags_i, input wr2_ready_i, output wr2_ready_o,
+     input [31:0] wr3_data_i, input [3:0] wr3_flags_i, input wr3_ready_i, output wr3_ready_o,
+     
+     // Read Interfaces
+     output [31:0] rd0_data_o, output [3:0] rd0_flags_o, output rd0_ready_o, input rd0_ready_i, 
+     output [31:0] rd1_data_o, output [3:0] rd1_flags_o, output rd1_ready_o, input rd1_ready_i, 
+     output [31:0] rd2_data_o, output [3:0] rd2_flags_o, output rd2_ready_o, input rd2_ready_i, 
+     output [31:0] rd3_data_o, output [3:0] rd3_flags_o, output rd3_ready_o, input rd3_ready_i
+     );
+   
+   wire [7:0] 	   sel_a;
+   
+   wire [BUF_SIZE-1:0] 	   buf_addra = wb_adr_i[BUF_SIZE+1:2];     // ignore address 1:0, 32-bit access only
+   wire [2:0] 		   which_buf = wb_adr_i[BUF_SIZE+4:BUF_SIZE+2];   // address 15:14 selects the buffer pool
+   
+   decoder_3_8 dec(.sel(which_buf),.res(sel_a));
+   
+   genvar 	 i;
+   
+   wire 	 go;
+
+   reg [2:0] 	 port[0:7];	 
+   reg [3:0] 	 read_src[0:3];
+   reg [3:0] 	 write_src[0:3];
+   
+   wire [7:0] 	 done;
+   wire [7:0] 	 error;
+   wire [7:0] 	 idle;
+   
+   wire [31:0] 	 buf_doa[0:7];
+   
+   wire [7:0] 	 buf_enb;
+   wire [7:0] 	 buf_web;
+   wire [BUF_SIZE-1:0] 	 buf_addrb[0:7];
+   wire [31:0] 	 buf_dib[0:7];
+   wire [31:0] 	 buf_dob[0:7];
+   
+   wire [31:0] 	 wr_data_i[0:7];
+   wire [3:0] 	 wr_flags_i[0:7];
+   wire [7:0] 	 wr_ready_i;
+   wire [7:0] 	 wr_ready_o;
+   
+   wire [31:0] 	 rd_data_o[0:7];
+   wire [3:0] 	 rd_flags_o[0:7];
+   wire [7:0] 	 rd_ready_o;
+   wire [7:0] 	 rd_ready_i;
+   
+   assign 	 status = {8'd0,idle[7:0],error[7:0],done[7:0]};
+
+   assign 	 s0 = buf_addrb[0];
+   assign 	 s1 = buf_addrb[1];
+   assign 	 s2 = buf_addrb[2];
+   assign 	 s3 = buf_addrb[3];
+   assign 	 s4 = buf_addrb[4];
+   assign 	 s5 = buf_addrb[5];
+   assign 	 s6 = buf_addrb[6];
+   assign 	 s7 = buf_addrb[7];
+   
+   wire [31:0] 	 fifo_ctrl;
+   setting_reg #(.my_addr(SET_ADDR)) 
+     sreg(.clk(stream_clk),.rst(stream_rst),.strobe(set_stb),.addr(set_addr),.in(set_data),
+	  .out(fifo_ctrl),.changed(go));
+
+   integer 	 k;
+   always @(posedge stream_clk)
+     if(stream_rst)
+       for(k=0;k<8;k=k+1)
+	 port[k] <= 4;   // disabled
+     else
+       for(k=0;k<8;k=k+1)
+	 if(go & (fifo_ctrl[31:28]==k))
+	   port[k] <= fifo_ctrl[27:25];
+
+   always @(posedge stream_clk)
+     if(stream_rst)
+       for(k=0;k<4;k=k+1)
+	 read_src[k] <= 8;  // disabled
+     else
+       for(k=0;k<4;k=k+1)
+	 if(go & fifo_ctrl[22] & (fifo_ctrl[27:25]==k))
+	   read_src[k] <= fifo_ctrl[31:28];
+   
+   always @(posedge stream_clk)
+     if(stream_rst)
+       for(k=0;k<4;k=k+1)
+	 write_src[k] <= 8;  // disabled
+     else
+       for(k=0;k<4;k=k+1)
+	 if(go & fifo_ctrl[23] & (fifo_ctrl[27:25]==k))
+	   write_src[k] <= fifo_ctrl[31:28];
+   
+   generate
+      for(i=0;i<8;i=i+1)
+	begin : gen_buffer
+	   RAMB16_S36_S36 dpram
+	     (.DOA(buf_doa[i]),.ADDRA(buf_addra),.CLKA(wb_clk_i),.DIA(wb_dat_i),.DIPA(4'h0),
+	      .ENA(wb_stb_i & sel_a[i]),.SSRA(0),.WEA(wb_we_i),
+	      .DOB(buf_dob[i]),.ADDRB(buf_addrb[i]),.CLKB(stream_clk),.DIB(buf_dib[i]),.DIPB(4'h0),
+	      .ENB(buf_enb[i]),.SSRB(0),.WEB(buf_web[i]) );
+	   
+/*	   
+	   ram_2port #(.DWIDTH(32),.AWIDTH(BUF_SIZE)) buffer
+	     (.clka(wb_clk_i),.ena(wb_stb_i & sel_a[i]),.wea(wb_we_i),
+	      .addra(buf_addra),.dia(wb_dat_i),.doa(buf_doa[i]),
+	      .clkb(stream_clk),.enb(buf_enb[i]),.web(buf_web[i]),
+	      .addrb(buf_addrb[i]),.dib(buf_dib[i]),.dob(buf_dob[i]));
+ 
+ */
+	   
+	   buffer_int #(.BUF_NUM(i),.BUF_SIZE(BUF_SIZE)) buffer_int
+	     (.clk(stream_clk),.rst(stream_rst),
+	      .ctrl_word(fifo_ctrl),.go(go & (fifo_ctrl[31:28]==i)),
+	      .done(done[i]),.error(error[i]),.idle(idle[i]),
+	      .en_o(buf_enb[i]),
+	      .we_o(buf_web[i]),
+	      .addr_o(buf_addrb[i]),
+	      .dat_to_buf(buf_dib[i]),
+	      .dat_from_buf(buf_dob[i]),
+	      .wr_data_i(wr_data_i[i]),
+	      .wr_flags_i(wr_flags_i[i]),
+	      .wr_ready_i(wr_ready_i[i]),
+	      .wr_ready_o(wr_ready_o[i]),
+	      .rd_data_o(rd_data_o[i]),
+	      .rd_flags_o(rd_flags_o[i]),
+	      .rd_ready_o(rd_ready_o[i]),
+	      .rd_ready_i(rd_ready_i[i]) );
+	   mux4 #(.WIDTH(37))
+	     mux4_wr (.en(~port[i][2]),.sel(port[i][1:0]),
+		      .i0({wr0_data_i,wr0_flags_i,wr0_ready_i}),
+		      .i1({wr1_data_i,wr1_flags_i,wr1_ready_i}),
+		      .i2({wr2_data_i,wr2_flags_i,wr2_ready_i}),
+		      .i3({wr3_data_i,wr3_flags_i,wr3_ready_i}),
+		      .o({wr_data_i[i],wr_flags_i[i],wr_ready_i[i]}) );
+	   mux4 #(.WIDTH(1))
+	     mux4_rd (.en(~port[i][2]),.sel(port[i][1:0]),
+		      .i0(rd0_ready_i),.i1(rd1_ready_i),.i2(rd2_ready_i),.i3(rd3_ready_i),
+		      .o(rd_ready_i[i]));
+	end // block: gen_buffer
+   endgenerate
+
+   //----------------------------------------------------------------------
+   // Wishbone Outputs
+
+   // Use the following lines if ram output and mux can be made fast enough
+
+   assign wb_err_o = 1'b0;  // Unused for now
+   assign wb_rty_o = 1'b0;  // Unused for now
+   
+   always @(posedge wb_clk_i)
+     wb_ack_o <= wb_stb_i & ~wb_ack_o;
+   assign wb_dat_o = buf_doa[which_buf];
+
+   // Use this if we can't make the RAM+MUX fast enough
+   // reg [31:0] wb_dat_o_reg;
+   // reg 	      stb_d1;
+
+   // always @(posedge wb_clk_i)
+   //  begin
+   //   wb_dat_o_reg <= buf_doa[which_buf];
+   //   stb_d1 <= wb_stb_i;
+   //   wb_ack_o <= (stb_d1 & ~wb_ack_o) | (wb_we_i & wb_stb_i);
+   //  end
+   //assign     wb_dat_o = wb_dat_o_reg;
+   
+   mux8 #(.WIDTH(1)) 
+     mux8_wr0(.en(~write_src[0][3]),.sel(write_src[0][2:0]), 
+	      .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]),
+	      .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]),
+	      .o(wr0_ready_o));
+
+   mux8 #(.WIDTH(1)) 
+     mux8_wr1(.en(~write_src[1][3]),.sel(write_src[1][2:0]), 
+	      .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]),
+	      .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]),
+	      .o(wr1_ready_o));
+
+   mux8 #(.WIDTH(1)) 
+     mux8_wr2(.en(~write_src[2][3]),.sel(write_src[2][2:0]), 
+	      .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]),
+	      .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]),
+	      .o(wr2_ready_o));
+
+   mux8 #(.WIDTH(1)) 
+     mux8_wr3(.en(~write_src[3][3]),.sel(write_src[3][2:0]), 
+	      .i0(wr_ready_o[0]), .i1(wr_ready_o[1]), .i2(wr_ready_o[2]), .i3(wr_ready_o[3]),
+	      .i4(wr_ready_o[4]), .i5(wr_ready_o[5]), .i6(wr_ready_o[6]), .i7(wr_ready_o[7]),
+	      .o(wr3_ready_o));
+
+   mux8 #(.WIDTH(37)) 
+     mux8_rd0(.en(~read_src[0][3]),.sel(read_src[0][2:0]), 
+	      .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}),
+	      .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}),
+	      .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}),
+	      .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}),
+	      .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}),
+	      .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}),
+	      .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}),
+	      .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}),
+	      .o({rd0_data_o,rd0_flags_o,rd0_ready_o}));
+   
+   mux8 #(.WIDTH(37)) 
+     mux8_rd1(.en(~read_src[1][3]),.sel(read_src[1][2:0]), 
+	      .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}),
+	      .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}),
+	      .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}),
+	      .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}),
+	      .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}),
+	      .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}),
+	      .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}),
+	      .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}),
+	      .o({rd1_data_o,rd1_flags_o,rd1_ready_o}));
+   
+   mux8 #(.WIDTH(37)) 
+     mux8_rd2(.en(~read_src[2][3]),.sel(read_src[2][2:0]), 
+	      .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}),
+	      .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}),
+	      .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}),
+	      .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}),
+	      .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}),
+	      .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}),
+	      .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}),
+	      .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}),
+	      .o({rd2_data_o,rd2_flags_o,rd2_ready_o}));
+   
+   mux8 #(.WIDTH(37)) 
+     mux8_rd3(.en(~read_src[3][3]),.sel(read_src[3][2:0]), 
+	      .i0({rd_data_o[0],rd_flags_o[0],rd_ready_o[0]}),
+	      .i1({rd_data_o[1],rd_flags_o[1],rd_ready_o[1]}),
+	      .i2({rd_data_o[2],rd_flags_o[2],rd_ready_o[2]}),
+	      .i3({rd_data_o[3],rd_flags_o[3],rd_ready_o[3]}),
+	      .i4({rd_data_o[4],rd_flags_o[4],rd_ready_o[4]}),
+	      .i5({rd_data_o[5],rd_flags_o[5],rd_ready_o[5]}),
+	      .i6({rd_data_o[6],rd_flags_o[6],rd_ready_o[6]}),
+	      .i7({rd_data_o[7],rd_flags_o[7],rd_ready_o[7]}),
+	      .o({rd3_data_o,rd3_flags_o,rd3_ready_o}));
+   
+   assign sys_int_o = (|error) | (|done);
+   
+endmodule // buffer_pool
diff --git a/usrp2/control_lib/newfifo/buffer_pool_tb.v b/usrp2/control_lib/newfifo/buffer_pool_tb.v
new file mode 100644
index 000000000..91a01d268
--- /dev/null
+++ b/usrp2/control_lib/newfifo/buffer_pool_tb.v
@@ -0,0 +1,58 @@
+
+module buffer_pool_tb();
+   
+   wire wb_clk_i;
+   wire wb_rst_i;
+   wire wb_we_i;
+   wire wb_stb_i;
+   wire [15:0] wb_adr_i;
+   wire [31:0] wb_dat_i;   
+   wire [31:0] wb_dat_o;
+   wire wb_ack_o;
+   wire wb_err_o;
+   wire wb_rty_o;
+
+   wire stream_clk, stream_rst;
+
+   wire set_stb;
+   wire [7:0] set_addr;
+   wire [31:0] set_data;
+
+   wire [31:0] wr0_data, wr1_data, wr2_data, wr3_data;
+   wire [31:0] rd0_data, rd1_data, rd2_data, rd3_data;
+   wire [3:0]  wr0_flags, wr1_flags, wr2_flags, wr3_flags;
+   wire [3:0]  rd0_flags, rd1_flags, rd2_flags, rd3_flags;
+   wire        wr0_ready, wr1_ready, wr2_ready, wr3_ready;
+   wire        rd0_ready, rd1_ready, rd2_ready, rd3_ready;
+   wire        wr0_write, wr1_write, wr2_write, wr3_write;
+   wire        rd0_read, rd1_read, rd2_read, rd3_read;
+
+   buffer_pool dut
+     (.wb_clk_i(wb_clk_i),
+      .wb_rst_i(wb_rst_i),
+      .wb_we_i(wb_we_i),
+      .wb_stb_i(wb_stb_i),
+      .wb_adr_i(wb_adr_i),
+      .wb_dat_i(wb_dat_i),   
+      .wb_dat_o(wb_dat_o),
+      .wb_ack_o(wb_ack_o),
+      .wb_err_o(wb_err_o),
+      .wb_rty_o(wb_rty_o),
+      
+      .stream_clk(stream_clk),
+      .stream_rst(stream_rst),
+      
+      .set_stb(set_stb),.set_addr(set_addr),.set_data(set_data),
+      
+      .wr0_data_i(wr0_data), .wr0_write_i(wr0_write), .wr0_flags_i(wr0_flags), .wr0_ready_o(wr0_ready),
+      .wr1_data_i(wr1_data), .wr1_write_i(wr1_write), .wr1_flags_i(wr1_flags), .wr1_ready_o(wr1_ready),
+      .wr2_data_i(wr2_data), .wr2_write_i(wr2_write), .wr2_flags_i(wr2_flags), .wr2_ready_o(wr2_ready),
+      .wr3_data_i(wr3_data), .wr3_write_i(wr3_write), .wr3_flags_i(wr3_flags), .wr3_ready_o(wr3_ready),
+      
+      .rd0_data_o(rd0_data), .rd0_read_i(rd0_read), .rd0_flags_o(rd0_flags), .rd0_ready_o(rd0_ready),
+      .rd1_data_o(rd1_data), .rd1_read_i(rd1_read), .rd1_flags_o(rd1_flags), .rd1_ready_o(rd1_ready),
+      .rd2_data_o(rd2_data), .rd2_read_i(rd2_read), .rd2_flags_o(rd2_flags), .rd2_ready_o(rd2_ready),
+      .rd3_data_o(rd3_data), .rd3_read_i(rd3_read), .rd3_flags_o(rd3_flags), .rd3_ready_o(rd3_ready)
+      );
+   
+endmodule // buffer_pool_tb
diff --git a/usrp2/control_lib/newfifo/fifo19_to_fifo36.v b/usrp2/control_lib/newfifo/fifo19_to_fifo36.v
new file mode 100644
index 000000000..5f9aeff9b
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo19_to_fifo36.v
@@ -0,0 +1,76 @@
+
+module fifo19_to_fifo36
+  (input clk, input reset, input clear,
+   input [18:0] f19_datain,
+   input f19_src_rdy_i,
+   output f19_dst_rdy_o,
+
+   output [35:0] f36_dataout,
+   output f36_src_rdy_o,
+   input f36_dst_rdy_i,
+   output [31:0] debug
+   );
+
+   reg 	 f36_sof, f36_eof, f36_occ;
+   
+   reg [1:0] state;
+   reg [15:0] dat0, dat1;
+
+   wire f19_sof  = f19_datain[16];
+   wire f19_eof  = f19_datain[17];
+   wire f19_occ  = f19_datain[18];
+
+   wire xfer_out = f36_src_rdy_o & f36_dst_rdy_i;
+
+   always @(posedge clk)
+     if(f19_src_rdy_i & ((state==0)|xfer_out))
+       f36_sof 	<= f19_sof;
+
+   always @(posedge clk)
+     if(f19_src_rdy_i & ((state != 2)|xfer_out))
+       f36_eof 	<= f19_eof;
+
+   always @(posedge clk)    // FIXME check this
+     if(f19_eof)
+       f36_occ 	<= {state[0],f19_occ};
+     else
+       f36_occ 	<= 0;
+   
+   always @(posedge clk)
+     if(reset)
+       state 	<= 0;
+     else
+       if(f19_src_rdy_i)
+	 case(state)
+	   0 : 
+	     if(f19_eof)
+	       state <= 2;
+	     else
+	       state <= 1;
+	   1 : 
+	     state <= 2;
+	   2 : 
+	     if(xfer_out)
+	       if(~f19_eof)
+		 state 	   <= 1;
+	   // remain in state 2 if we are at eof
+	 endcase // case(state)
+       else
+	 if(xfer_out)
+	   state 	   <= 0;
+
+   always @(posedge clk)
+     if(f19_src_rdy_i & (state==1))
+       dat1 		   <= f19_datain;
+
+   always @(posedge clk)
+     if(f19_src_rdy_i & ((state==0) | xfer_out))
+       dat0 		   <= f19_datain;
+   
+   assign    f19_dst_rdy_o  = xfer_out | (state != 2);
+   assign    f36_dataout    = {f36_occ,f36_eof,f36_sof,dat0,dat1};
+   assign    f36_src_rdy_o  = (state == 2);
+
+   assign    debug = state;
+   
+endmodule // fifo19_to_fifo36
diff --git a/usrp2/control_lib/newfifo/fifo19_to_ll8.v b/usrp2/control_lib/newfifo/fifo19_to_ll8.v
new file mode 100644
index 000000000..4707f7523
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo19_to_ll8.v
@@ -0,0 +1,53 @@
+
+module fifo19_to_ll8
+  (input clk, input reset, input clear,
+   input [18:0] f19_data,
+   input f19_src_rdy_i,
+   output f19_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   f19_sof 	= f19_data[16];
+   wire   f19_eof 	= f19_data[17];
+   wire   f19_occ 	= f19_data[18];
+   
+   wire advance, end_early;
+   reg 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 = f19_data[15:8];
+       1 : ll_data = f19_data[7:0];
+       default : ll_data = f19_data[15:8];
+       endcase // case (state)
+   
+   assign ll_sof 	 = (state==0) & f19_sof;
+   assign ll_eof 	 = f19_eof & ((f19_occ==1)|(state==1));
+   
+   assign ll_src_rdy 	 = f19_src_rdy_i;
+
+   assign advance 	 = ll_src_rdy & ll_dst_rdy;
+   assign f19_dst_rdy_o  = advance & ((state==1)|ll_eof);
+   
+endmodule // fifo19_to_ll8
+
diff --git a/usrp2/control_lib/newfifo/fifo36_to_fifo18.v b/usrp2/control_lib/newfifo/fifo36_to_fifo18.v
new file mode 100644
index 000000000..b636ab9ca
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo36_to_fifo18.v
@@ -0,0 +1,40 @@
+
+module fifo36_to_fifo18
+  (input clk, input reset, input clear,
+   input [35:0] f36_datain,
+   input f36_src_rdy_i,
+   output f36_dst_rdy_o,
+   
+   output [17:0] f18_dataout,
+   output f18_src_rdy_o,
+   input f18_dst_rdy_i );
+
+   wire   f36_sof  = f36_datain[32];
+   wire   f36_eof  = f36_datain[33];
+   wire   f36_occ  = f36_datain[35:34];
+
+   reg phase;
+
+   wire half_line 	   = f36_eof & ((f36_occ==1)|(f36_occ==2));
+   
+   assign f18_dataout[15:0] = phase ? f36_datain[15:0] : f36_datain[31:16];
+   assign f18_dataout[16]  = phase ? 0 : f36_sof;
+   assign f18_dataout[17]  = phase ? f36_eof : half_line;
+   
+   assign f18_src_rdy_o    = f36_src_rdy_i;
+   assign f36_dst_rdy_o    = (phase | half_line) & f18_dst_rdy_i;
+	
+   wire f18_xfer 	   = f18_src_rdy_o & f18_dst_rdy_i;
+   wire f36_xfer 	   = f36_src_rdy_i & f36_dst_rdy_o;
+
+   always @(posedge clk)
+     if(reset)
+       phase 		  <= 0;
+     else if(f36_xfer)
+       phase 		  <= 0;
+     else if(f18_xfer)
+       phase 		  <= 1;
+   
+       
+endmodule // fifo36_to_fifo18
+
diff --git a/usrp2/control_lib/newfifo/fifo36_to_fifo19.v b/usrp2/control_lib/newfifo/fifo36_to_fifo19.v
new file mode 100644
index 000000000..de249aaeb
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo36_to_fifo19.v
@@ -0,0 +1,41 @@
+
+module fifo36_to_fifo19
+  (input clk, input reset, input clear,
+   input [35:0] f36_datain,
+   input f36_src_rdy_i,
+   output f36_dst_rdy_o,
+   
+   output [18:0] f19_dataout,
+   output f19_src_rdy_o,
+   input f19_dst_rdy_i );
+
+   wire   f36_sof  = f36_datain[32];
+   wire   f36_eof  = f36_datain[33];
+   wire   f36_occ  = f36_datain[35:34];
+
+   reg phase;
+
+   wire half_line 	   = f36_eof & ((f36_occ==1)|(f36_occ==2));
+   
+   assign f19_dataout[15:0] = phase ? f36_datain[15:0] : f36_datain[31:16];
+   assign f19_dataout[16]  = phase ? 0 : f36_sof;
+   assign f19_dataout[17]  = phase ? f36_eof : half_line;
+   assign f19_dataout[18]  = f19_dataout[17] & ((f36_occ==1)|(f36_occ==3));
+   
+   assign f19_src_rdy_o    = f36_src_rdy_i;
+   assign f36_dst_rdy_o    = (phase | half_line) & f19_dst_rdy_i;
+	
+   wire f19_xfer 	   = f19_src_rdy_o & f19_dst_rdy_i;
+   wire f36_xfer 	   = f36_src_rdy_i & f36_dst_rdy_o;
+
+   always @(posedge clk)
+     if(reset)
+       phase 		  <= 0;
+     else if(f36_xfer)
+       phase 		  <= 0;
+     else if(f19_xfer)
+       phase 		  <= 1;
+   
+       
+endmodule // fifo36_to_fifo19
+
diff --git a/usrp2/control_lib/newfifo/fifo36_to_ll8.v b/usrp2/control_lib/newfifo/fifo36_to_ll8.v
new file mode 100644
index 000000000..0dee1dfc6
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo36_to_ll8.v
@@ -0,0 +1,60 @@
+
+module fifo36_to_ll8
+  (input clk, input reset, input clear,
+   input [35:0] f36_data,
+   input f36_src_rdy_i,
+   output f36_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,
+
+   output [31:0] debug);
+
+   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   f36_sof = f36_data[32];
+   wire   f36_eof = f36_data[33];
+   wire   f36_occ = f36_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 = f36_data[31:24];
+       1 : ll_data = f36_data[23:16];
+       2 : ll_data = f36_data[15:8];
+       3 : ll_data = f36_data[7:0];
+       default : ll_data = f36_data[31:24];
+       endcase // case (state)
+   
+   assign ll_sof 	 = (state==0) & f36_sof;
+   assign ll_eof 	 = f36_eof & (((state==0)&(f36_occ==1)) |
+			       ((state==1)&(f36_occ==2)) |
+			       ((state==2)&(f36_occ==3)) |
+			       (state==3));
+   
+   assign ll_src_rdy 	 = f36_src_rdy_i;
+
+   assign advance 	 = ll_src_rdy & ll_dst_rdy;
+   assign f36_dst_rdy_o  = advance & ((state==3)|ll_eof);
+   assign debug 	 = state;
+   
+endmodule // ll8_to_fifo36
diff --git a/usrp2/control_lib/newfifo/fifo_2clock.v b/usrp2/control_lib/newfifo/fifo_2clock.v
new file mode 100644
index 000000000..34c85ccb4
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_2clock.v
@@ -0,0 +1,117 @@
+
+// FIXME ignores the AWIDTH (fifo size) parameter
+
+module fifo_2clock
+  #(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(arst),
+		.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(arst),
+		      .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(arst),
+		      .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(arst),
+		.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(arst),
+		      .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;
+   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;
+`endif
+endmodule // fifo_2clock
+
+*/
diff --git a/usrp2/control_lib/newfifo/fifo_2clock_cascade.v b/usrp2/control_lib/newfifo/fifo_2clock_cascade.v
new file mode 100644
index 000000000..5ce726977
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_2clock_cascade.v
@@ -0,0 +1,35 @@
+
+module fifo_2clock_cascade
+  #(parameter WIDTH=32, SIZE=9)
+   (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 [WIDTH-1:0] data_int1, data_int2;
+   wire 	    src_rdy_int1, src_rdy_int2, dst_rdy_int1, dst_rdy_int2;
+   wire [SIZE-1:0]  level_wclk, level_rclk;
+   wire [4:0] 	    s1_space, s1_occupied, s2_space, s2_occupied;
+   wire [15:0] 	    l_space, l_occupied;
+   
+   fifo_short #(.WIDTH(WIDTH)) shortfifo
+     (.clk(wclk), .reset(arst), .clear(0),
+      .datain(datain), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o),
+      .dataout(data_int1), .src_rdy_o(src_rdy_int1), .dst_rdy_i(dst_rdy_int1),
+      .space(s1_space), .occupied(s1_occupied) );
+   
+   fifo_2clock #(.WIDTH(WIDTH),.SIZE(SIZE)) fifo_2clock
+     (.wclk(wclk), .datain(data_int1), .src_rdy_i(src_rdy_int1), .dst_rdy_o(dst_rdy_int1), .space(l_space),
+      .rclk(rclk), .dataout(data_int2), .src_rdy_o(src_rdy_int2), .dst_rdy_i(dst_rdy_int2), .occupied(l_occupied),
+      .arst(arst) );
+   
+   fifo_short #(.WIDTH(WIDTH)) shortfifo2
+     (.clk(rclk), .reset(arst), .clear(0),
+      .datain(data_int2), .src_rdy_i(src_rdy_int2), .dst_rdy_o(dst_rdy_int2),
+      .dataout(dataout), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i),
+      .space(s2_space), .occupied(s2_occupied));
+
+   // Be conservative -- Only advertise space from input side of fifo, occupied from output side
+   assign 	    space = {11'b0,s1_space} + l_space;
+   assign 	    occupied = {11'b0,s2_occupied} + l_occupied;
+   
+endmodule // fifo_2clock_cascade
diff --git a/usrp2/control_lib/newfifo/fifo_cascade.v b/usrp2/control_lib/newfifo/fifo_cascade.v
new file mode 100644
index 000000000..fdd8449bc
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_cascade.v
@@ -0,0 +1,52 @@
+
+
+// This FIFO exists to provide an intermediate point for the data on its
+// long trek from one RAM (in the buffer pool) to another (in the longfifo)
+// The shortfifo is more flexible in its placement since it is based on
+// distributed RAM
+
+// This one has the shortfifo on both the in and out sides.
+module fifo_cascade
+  #(parameter WIDTH=32, SIZE=9)
+    (input clk, input reset, input clear,
+     input [WIDTH-1:0] datain,
+     input src_rdy_i,
+     output dst_rdy_o,
+     output [WIDTH-1:0] dataout,
+     output src_rdy_o,
+     input dst_rdy_i,
+     output [15:0] space,
+     output [15:0] occupied);
+
+   wire [WIDTH-1:0] data_int, data_int2;
+   wire src_rdy_1, dst_rdy_1, src_rdy_2, dst_rdy_2;
+   
+   wire [4:0] 	    s1_space, s1_occupied, s2_space, s2_occupied;
+   wire [15:0] 	    l_space, l_occupied;
+   
+   fifo_short #(.WIDTH(WIDTH)) head_fifo
+     (.clk(clk),.reset(reset),.clear(clear),
+      .datain(datain), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o),
+      .dataout(data_int), .src_rdy_o(src_rdy_1), .dst_rdy_i(dst_rdy_1),
+      .space(s1_space),.occupied(s1_occupied) );
+      
+   fifo_long #(.WIDTH(WIDTH),.SIZE(SIZE)) middle_fifo
+     (.clk(clk),.reset(reset),.clear(clear),
+      .datain(data_int), .src_rdy_i(src_rdy_1), .dst_rdy_o(dst_rdy_1),
+      .dataout(data_int2), .src_rdy_o(src_rdy_2), .dst_rdy_i(dst_rdy_2),
+      .space(l_space),.occupied(l_occupied) );
+   
+   fifo_short #(.WIDTH(WIDTH)) tail_fifo
+     (.clk(clk),.reset(reset),.clear(clear),
+      .datain(data_int2), .src_rdy_i(src_rdy_2), .dst_rdy_o(dst_rdy_2),
+      .dataout(dataout), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i),
+      .space(s2_space),.occupied(s2_occupied) );
+   
+   assign 	    space = {11'b0,s1_space} + {11'b0,s2_space} + l_space;
+   assign 	    occupied = {11'b0,s1_occupied} + {11'b0,s2_occupied} + l_occupied;
+      
+endmodule // cascadefifo2
+
+
+
+
diff --git a/usrp2/control_lib/newfifo/fifo_long.v b/usrp2/control_lib/newfifo/fifo_long.v
new file mode 100644
index 000000000..0426779f6
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_long.v
@@ -0,0 +1,148 @@
+
+// FIFO intended to be interchangeable with shortfifo, but
+//  based on block ram instead of SRL16's
+//  only one clock domain
+
+// Port A is write port, Port B is read port
+
+module fifo_long
+  #(parameter WIDTH=32, SIZE=9)
+   (input clk, input reset, input clear,
+    input [WIDTH-1:0] datain,
+    input src_rdy_i,
+    output dst_rdy_o,
+    output [WIDTH-1:0] dataout,
+    output src_rdy_o,
+    input dst_rdy_i,
+    
+    output reg [15:0] space,
+    output reg [15:0] occupied);
+   
+   wire write 	     = src_rdy_i & dst_rdy_o;
+   wire read 	     = dst_rdy_i & src_rdy_o;
+   wire full, empty;
+   
+   assign dst_rdy_o  = ~full;
+   assign src_rdy_o  = ~empty;
+   
+   // Read side states
+   localparam 	  EMPTY = 0;
+   localparam 	  PRE_READ = 1;
+   localparam 	  READING = 2;
+
+   reg [SIZE-1:0] wr_addr, rd_addr;
+   reg [1:0] 	  read_state;
+
+   reg 	  empty_reg, full_reg;
+   always @(posedge clk)
+     if(reset)
+       wr_addr <= 0;
+     else if(clear)
+       wr_addr <= 0;
+     else if(write)
+       wr_addr <= wr_addr + 1;
+
+   ram_2port #(.DWIDTH(WIDTH),.AWIDTH(SIZE))
+     ram (.clka(clk),
+	  .ena(1'b1),
+	  .wea(write),
+	  .addra(wr_addr),
+	  .dia(datain),
+	  .doa(),
+
+	  .clkb(clk),
+	  .enb((read_state==PRE_READ)|read),
+	  .web(0),
+	  .addrb(rd_addr),
+	  .dib(0),
+	  .dob(dataout));
+
+   always @(posedge clk)
+     if(reset)
+       begin
+	  read_state <= EMPTY;
+	  rd_addr <= 0;
+	  empty_reg <= 1;
+       end
+     else
+       if(clear)
+	 begin
+	    read_state <= EMPTY;
+	    rd_addr <= 0;
+	    empty_reg <= 1;
+	 end
+       else 
+	 case(read_state)
+	   EMPTY :
+	     if(write)
+	       begin
+		  //rd_addr <= wr_addr;
+		  read_state <= PRE_READ;
+	       end
+	   PRE_READ :
+	     begin
+		read_state <= READING;
+		empty_reg <= 0;
+		rd_addr <= rd_addr + 1;
+	     end
+	   
+	   READING :
+	     if(read)
+	       if(rd_addr == wr_addr)
+		 begin
+		    empty_reg <= 1;
+		    if(write)
+		      read_state <= PRE_READ;
+		    else
+		      read_state <= EMPTY;
+		 end
+	       else
+		 rd_addr <= rd_addr + 1;
+	 endcase // case(read_state)
+
+   wire [SIZE-1:0] dont_write_past_me = rd_addr - 3;
+   wire 	   becoming_full = wr_addr == dont_write_past_me;
+     
+   always @(posedge clk)
+     if(reset)
+       full_reg <= 0;
+     else if(clear)
+       full_reg <= 0;
+     else if(read & ~write)
+       full_reg <= 0;
+     //else if(write & ~read & (wr_addr == (rd_addr-3)))
+     else if(write & ~read & becoming_full)
+       full_reg <= 1;
+
+   //assign empty = (read_state != READING);
+   assign empty = empty_reg;
+
+   // assign full = ((rd_addr - 1) == wr_addr);
+   assign full = full_reg;
+
+   //////////////////////////////////////////////
+   // space and occupied are for diagnostics only
+   // not guaranteed exact
+
+   localparam NUMLINES = (1<<SIZE)-2;
+   always @(posedge clk)
+     if(reset)
+       space <= NUMLINES;
+     else if(clear)
+       space <= NUMLINES;
+     else if(read & ~write)
+       space <= space + 1;
+     else if(write & ~read)
+       space <= space - 1;
+   
+   always @(posedge clk)
+     if(reset)
+       occupied <= 0;
+     else if(clear)
+       occupied <= 0;
+     else if(read & ~write)
+       occupied <= occupied - 1;
+     else if(write & ~read)
+       occupied <= occupied + 1;
+   
+endmodule // fifo_long
diff --git a/usrp2/control_lib/newfifo/fifo_new_tb.vcd b/usrp2/control_lib/newfifo/fifo_new_tb.vcd
new file mode 100644
index 000000000..796889e7d
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_new_tb.vcd
@@ -0,0 +1,5506 @@
+$date
+	Thu Mar 19 17:21:11 2009
+$end
+$version
+	Icarus Verilog
+$end
+$timescale
+	1ps
+$end
+$scope module fifo_new_tb $end
+$var wire 1 ! dst_rdy_f36i $end
+$var wire 36 " f36_in [35:0] $end
+$var wire 36 # i1 [35:0] $end
+$var wire 1 $ i1_dr $end
+$var wire 1 % i1_sr $end
+$var wire 19 & i2 [18:0] $end
+$var wire 1 ' i2_dr $end
+$var wire 1 ( i2_sr $end
+$var wire 19 ) i3 [18:0] $end
+$var wire 1 * i3_dr $end
+$var wire 1 + i3_sr $end
+$var wire 36 , i4 [35:0] $end
+$var wire 1 - i4_sr $end
+$var wire 8 . ll_data [7:0] $end
+$var wire 1 / ll_dst_rdy_n $end
+$var wire 1 0 ll_eof_n $end
+$var wire 1 1 ll_sof_n $end
+$var wire 1 2 ll_src_rdy_n $end
+$var reg 1 3 clear $end
+$var reg 1 4 clk $end
+$var reg 16 5 count [15:0] $end
+$var reg 1 6 dst_rdy_f36o $end
+$var reg 32 7 f36_data [31:0] $end
+$var reg 1 8 f36_eof $end
+$var reg 2 9 f36_occ [1:0] $end
+$var reg 1 : f36_sof $end
+$var reg 1 ; i4_dr $end
+$var reg 1 < rst $end
+$var reg 1 = src_rdy_f36i $end
+$scope module fifo_short1 $end
+$var wire 1 > clear $end
+$var wire 1 ? clk $end
+$var wire 36 @ datain [35:0] $end
+$var wire 36 A dataout [35:0] $end
+$var wire 1 $ dst_rdy_i $end
+$var wire 1 ! dst_rdy_o $end
+$var wire 1 B read $end
+$var wire 1 C reset $end
+$var wire 1 D src_rdy_i $end
+$var wire 1 % src_rdy_o $end
+$var wire 1 E write $end
+$var reg 4 F a [3:0] $end
+$var reg 1 G empty $end
+$var reg 1 H full $end
+$var reg 5 I occupied [4:0] $end
+$var reg 5 J space [4:0] $end
+$scope begin gen_srl16[0] $end
+$scope module srl16e $end
+$var wire 1 K A0 $end
+$var wire 1 L A1 $end
+$var wire 1 M A2 $end
+$var wire 1 N A3 $end
+$var wire 1 E CE $end
+$var wire 1 ? CLK $end
+$var wire 1 O D $end
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+$scope module srl16e $end
+$var wire 1 R A0 $end
+$var wire 1 S A1 $end
+$var wire 1 T A2 $end
+$var wire 1 U A3 $end
+$var wire 1 E CE $end
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+$var wire 1 V D $end
+$var wire 1 W Q $end
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+$var wire 1 Z A1 $end
+$var wire 1 [ A2 $end
+$var wire 1 \ A3 $end
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+$var wire 1 ^ Q $end
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+$var wire 1 ` A0 $end
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+$var wire 1 c A3 $end
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+$var wire 1 j A3 $end
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+$var wire 1 x A3 $end
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+$var wire 1 !" A3 $end
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+$var wire 1 %" A0 $end
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+$var wire 1 /" A3 $end
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+$var wire 1 E CE $end
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+$var wire 1 ,# A3 $end
+$var wire 1 E CE $end
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+$var wire 1 3# A3 $end
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+$var wire 1 :# A3 $end
+$var wire 1 E CE $end
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+$var wire 19 -$ f19_dataout [18:0] $end
+$var wire 1 ' f19_dst_rdy_i $end
+$var wire 1 ( f19_src_rdy_o $end
+$var wire 1 .$ f19_xfer $end
+$var wire 36 /$ f36_datain [35:0] $end
+$var wire 1 $ f36_dst_rdy_o $end
+$var wire 1 0$ f36_eof $end
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+$var wire 1 2$ f36_sof $end
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+$var wire 19 7$ f19_data [18:0] $end
+$var wire 1 ' f19_dst_rdy_o $end
+$var wire 1 8$ f19_eof $end
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+$var wire 1 :$ f19_sof $end
+$var wire 1 ( f19_src_rdy_i $end
+$var wire 1 ;$ ll_dst_rdy $end
+$var wire 1 / ll_dst_rdy_n $end
+$var wire 1 <$ ll_eof $end
+$var wire 1 0 ll_eof_n $end
+$var wire 1 =$ ll_sof $end
+$var wire 1 1 ll_sof_n $end
+$var wire 1 >$ ll_src_rdy $end
+$var wire 1 2 ll_src_rdy_n $end
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+$var wire 19 A$ f19_data [18:0] $end
+$var wire 1 * f19_dst_rdy_i $end
+$var wire 1 + f19_src_rdy_o $end
+$var wire 8 B$ ll_data [7:0] $end
+$var wire 1 C$ ll_dst_rdy $end
+$var wire 1 / ll_dst_rdy_n $end
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+$var wire 1 0 ll_eof_n $end
+$var wire 1 E$ ll_sof $end
+$var wire 1 1 ll_sof_n $end
+$var wire 1 F$ ll_src_rdy $end
+$var wire 1 2 ll_src_rdy_n $end
+$var wire 1 C reset $end
+$var wire 1 G$ xfer_out $end
+$var reg 8 H$ dat0 [7:0] $end
+$var reg 8 I$ dat1 [7:0] $end
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+$var wire 1 * f19_dst_rdy_o $end
+$var wire 1 O$ f19_eof $end
+$var wire 1 P$ f19_occ $end
+$var wire 1 Q$ f19_sof $end
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+$var wire 36 R$ f36_dataout [35:0] $end
+$var wire 1 S$ f36_dst_rdy_i $end
+$var wire 1 - f36_src_rdy_o $end
+$var wire 1 C reset $end
+$var wire 1 T$ xfer_out $end
+$var reg 16 U$ dat0 [15:0] $end
+$var reg 16 V$ dat1 [15:0] $end
+$var reg 1 W$ f36_eof $end
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+$var reg 1 Y$ f36_sof $end
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+$upscope $end
+$upscope $end
+$enddefinitions $end
+#0
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diff --git a/usrp2/control_lib/newfifo/fifo_short.v b/usrp2/control_lib/newfifo/fifo_short.v
new file mode 100644
index 000000000..53a7603c7
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_short.v
@@ -0,0 +1,95 @@
+
+module fifo_short
+  #(parameter WIDTH=32)
+   (input clk, input reset, input clear,
+    input [WIDTH-1:0] datain,
+    input src_rdy_i,
+    output dst_rdy_o,
+    output [WIDTH-1:0] dataout,
+    output src_rdy_o,
+    input dst_rdy_i,
+    
+    output reg [4:0] space,
+    output reg [4:0] occupied);
+
+   reg full, empty;
+   wire write 	     = src_rdy_i & dst_rdy_o;
+   wire read 	     = dst_rdy_i & src_rdy_o;
+
+   assign dst_rdy_o  = ~full;
+   assign src_rdy_o  = ~empty;
+   
+   reg [3:0] 	  a;
+   genvar 	  i;
+   
+   generate
+      for (i=0;i<WIDTH;i=i+1)
+	begin : gen_srl16
+	   SRL16E
+	     srl16e(.Q(dataout[i]),
+		    .A0(a[0]),.A1(a[1]),.A2(a[2]),.A3(a[3]),
+		    .CE(write),.CLK(clk),.D(datain[i]));
+	end
+   endgenerate
+   
+   always @(posedge clk)
+     if(reset)
+       begin
+	  a <= 0;
+	  empty <= 1;
+	  full <= 0;
+       end
+     else if(clear)
+       begin
+	  a <= 0;
+	  empty <= 1;
+	  full<= 0;
+       end
+     else if(read & ~write)
+       begin
+	  full <= 0;
+	  if(a==0)
+	    empty <= 1;
+	  else
+	    a <= a - 1;
+       end
+     else if(write & ~read)
+       begin
+	  empty <= 0;
+	  if(~empty)
+	    a <= a + 1;
+	  if(a == 14)
+	    full <= 1;
+       end
+
+   // NOTE will fail if you write into a full fifo or read from an empty one
+
+   //////////////////////////////////////////////////////////////
+   // space and occupied are used for diagnostics, not 
+   // guaranteed correct
+   
+   //assign space = full ? 0 : empty ? 16 : 15-a;
+   //assign occupied = empty ? 0 : full ? 16 : a+1;
+
+   always @(posedge clk)
+     if(reset)
+       space <= 16;
+     else if(clear)
+       space <= 16;
+     else if(read & ~write)
+       space <= space + 1;
+     else if(write & ~read)
+       space <= space - 1;
+   
+   always @(posedge clk)
+     if(reset)
+       occupied <= 0;
+     else if(clear)
+       occupied <= 0;
+     else if(read & ~write)
+       occupied <= occupied - 1;
+     else if(write & ~read)
+       occupied <= occupied + 1;
+      
+endmodule // fifo_short
+
diff --git a/usrp2/control_lib/newfifo/fifo_spec.txt b/usrp2/control_lib/newfifo/fifo_spec.txt
new file mode 100644
index 000000000..133b9fa8e
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_spec.txt
@@ -0,0 +1,36 @@
+
+
+FIFO and Buffer Interface Spec
+
+Buffer Interface Data Wires -- matches fifo36
+     DATA[31:0]
+     FLAGS[3:0]
+     Bit 0	SOP
+     Bit 1	EOP
+	If SOP=1 && EOP=1, OCC contains error flags
+     Bits 3:2	OCC[1:0] --> 00 = all 4 bytes
+		     01 = 1 byte
+		     10 = 2 bytes
+		     11 = 3 bytes
+
+fifo36 -->  {OCC[1:0],EOP,SOP,DATA[31:0]}
+       OCC same as buffer interface
+
+fifo19 -->  {OCC,EOP,SOP,DATA[15:0]}    
+       Doesn't fit well into BRAM, dist RAM ok
+       OCC = 1 means last word is half full
+	   = 0 means last word is full
+
+fifo18 -->  {EOP,SOP,DATA[15:0]}
+       No half-word capability?  Should we drop sop instead?
+
+Control Wires - Data into FIFO
+	SRC_RDY_i    Upstream has data for me
+	DST_RDY_o    I have space
+		     Transfer occurs if SRC_RDI_i && DST_RDY_o
+	
+Control Wires - Data out of FIFO
+	SRC_RDY_o    I have data for downstream
+	DST_RDY_i    Downstream has space
+		     Transfer occurs if SRC_RDI_o && DST_RDY_i
+	
diff --git a/usrp2/control_lib/newfifo/fifo_tb.v b/usrp2/control_lib/newfifo/fifo_tb.v
new file mode 100644
index 000000000..f561df7fa
--- /dev/null
+++ b/usrp2/control_lib/newfifo/fifo_tb.v
@@ -0,0 +1,158 @@
+module fifo_new_tb();
+   
+   reg clk = 0;
+   reg rst = 1;
+   reg clear = 0;
+   initial #1000 rst = 0;
+   always #50 clk = ~clk;
+   
+   reg [31:0] f36_data = 0;
+   reg [1:0] f36_occ = 0;
+   reg f36_sof = 0, f36_eof = 0;
+   
+   wire [35:0] f36_in = {f36_occ,f36_eof,f36_sof,f36_data};
+   reg src_rdy_f36i  = 0;
+   wire dst_rdy_f36i;
+
+   wire [35:0] f36_out, f36_out2;
+   wire src_rdy_f36o;
+   reg dst_rdy_f36o  = 0;
+   
+   //fifo_cascade #(.WIDTH(36), .SIZE(4)) fifo_cascade36
+   //fifo_long #(.WIDTH(36), .SIZE(4)) fifo_cascade36
+
+   wire i1_sr, i1_dr;
+   wire i2_sr, i2_dr;
+   wire i3_sr, i3_dr;
+   reg i4_dr = 0;
+   wire i4_sr;
+      
+   wire [35:0] i1, i4;
+   wire [18:0] i2, i3;
+   
+   wire [7:0] ll_data;
+   wire ll_src_rdy_n, ll_dst_rdy_n, ll_sof_n, ll_eof_n;
+   
+   fifo_short #(.WIDTH(36)) fifo_short1
+     (.clk(clk),.reset(rst),.clear(clear),
+      .datain(f36_in),.src_rdy_i(src_rdy_f36i),.dst_rdy_o(dst_rdy_f36i),
+      .dataout(i1),.src_rdy_o(i1_sr),.dst_rdy_i(i1_dr) );
+
+   fifo36_to_fifo19 fifo36_to_fifo19
+     (.clk(clk),.reset(rst),.clear(clear),
+      .f36_datain(i1),.f36_src_rdy_i(i1_sr),.f36_dst_rdy_o(i1_dr),
+      .f19_dataout(i2),.f19_src_rdy_o(i2_sr),.f19_dst_rdy_i(i2_dr) );
+
+   fifo19_to_ll8 fifo19_to_ll8
+     (.clk(clk),.reset(rst),.clear(clear),
+      .f19_data(i2),.f19_src_rdy_i(i2_sr),.f19_dst_rdy_o(i2_dr),
+      .ll_data(ll_data),.ll_sof_n(ll_sof_n),.ll_eof_n(ll_eof_n),
+      .ll_src_rdy_n(ll_src_rdy_n),.ll_dst_rdy_n(ll_dst_rdy_n));
+
+   ll8_to_fifo19 ll8_to_fifo19
+     (.clk(clk),.reset(rst),.clear(clear),
+      .ll_data(ll_data),.ll_sof_n(ll_sof_n),.ll_eof_n(ll_eof_n),
+      .ll_src_rdy_n(ll_src_rdy_n),.ll_dst_rdy_n(ll_dst_rdy_n),
+      .f19_data(i3),.f19_src_rdy_o(i3_sr),.f19_dst_rdy_i(i3_dr) );
+
+   fifo19_to_fifo36 fifo19_to_fifo36
+     (.clk(clk),.reset(rst),.clear(clear),
+      .f19_datain(i3),.f19_src_rdy_i(i3_sr),.f19_dst_rdy_o(i3_dr),
+      .f36_dataout(i4),.f36_src_rdy_o(i4_sr),.f36_dst_rdy_i(i4_dr) );
+     
+   task ReadFromFIFO36;
+      begin
+	 $display("Read from FIFO36");
+	 #1 i4_dr <= 1;
+	 while(1)
+	   begin
+	      while(~i4_sr)
+		@(posedge clk);
+	      $display("Read: %h",i4);
+	      @(posedge clk);
+	   end
+      end
+   endtask // ReadFromFIFO36
+
+   reg [15:0] count;
+   task PutPacketInFIFO36;
+      input [31:0] data_start;
+      input [31:0] data_len;
+      begin
+	 count 	      <= 4;
+	 src_rdy_f36i <= 1;
+	 f36_data     <= data_start;
+	 f36_sof      <= 1;
+	 f36_eof      <= 0;
+	 f36_occ      <= 0;
+	
+	 $display("Put Packet in FIFO36");
+	 while(~dst_rdy_f36i)
+	   @(posedge clk);
+	 @(posedge clk);
+	 $display("PPI_FIFO36: Entered First Line");
+	 f36_sof <= 0;
+	 while(count+4 < data_len)
+	   begin
+	      f36_data <= f36_data + 32'h01010101;
+	      count    <= count + 4;
+	      while(~dst_rdy_f36i)
+		@(posedge clk);
+	      @(posedge clk);
+	      $display("PPI_FIFO36: Entered New Line");
+	   end
+	 f36_data  <= f36_data + 32'h01010101;
+	 f36_eof   <= 1;
+	 if(count + 4 == data_len)
+	   f36_occ <= 0;
+	 else if(count + 3 == data_len)
+	   f36_occ <= 3;
+	 else if(count + 2 == data_len)
+	   f36_occ <= 2;
+	 else
+	   f36_occ <= 1;
+	 while(~dst_rdy_f36i)
+	   @(posedge clk);
+	 @(posedge clk);
+	 f36_occ      <= 0;
+	 f36_eof      <= 0;
+	 f36_data     <= 0;
+	 src_rdy_f36i <= 0;
+	 $display("PPI_FIFO36: Entered Last Line");
+      end
+   endtask // PutPacketInFIFO36
+   
+   initial $dumpfile("fifo_new_tb.vcd");
+   initial $dumpvars(0,fifo_new_tb);
+
+   initial
+     begin
+	@(negedge rst);
+	//#10000;
+	@(posedge clk);
+	@(posedge clk);
+	@(posedge clk);
+	@(posedge clk);
+	ReadFromFIFO36;
+     end
+   
+   initial
+     begin
+	@(negedge rst);
+	@(posedge clk);
+	@(posedge clk);
+	PutPacketInFIFO36(32'hA0B0C0D0,12);
+	@(posedge clk);
+	@(posedge clk);
+	#10000;
+	@(posedge clk);
+	PutPacketInFIFO36(32'hE0F0A0B0,36);
+	@(posedge clk);
+	@(posedge clk);
+	@(posedge clk);
+	@(posedge clk);
+	@(posedge clk);
+     end
+
+   initial #20000 $finish;
+endmodule // longfifo_tb
diff --git a/usrp2/control_lib/newfifo/ll8_shortfifo.v b/usrp2/control_lib/newfifo/ll8_shortfifo.v
new file mode 100644
index 000000000..39ada9a4f
--- /dev/null
+++ b/usrp2/control_lib/newfifo/ll8_shortfifo.v
@@ -0,0 +1,13 @@
+
+
+module ll8_shortfifo
+  (input clk, input reset, input clear,
+   input [7:0] datain, input sof_i, input eof_i, input error_i, input src_rdy_i, output dst_rdy_o,
+   output [7:0] dataout, output sof_o, output eof_o, output error_o, output src_rdy_o, input dst_rdy_i);
+
+   fifo_short #(.WIDTH(11)) fifo_short
+     (.clk(clk), .reset(reset), .clear(clear),
+      .datain({error_i,eof_i,sof_i,datain}), .src_rdy_i(src_rdy_i), .dst_rdy_o(dst_rdy_o),
+      .dataout({error_o,eof_o,sof_o,dataout}), .src_rdy_o(src_rdy_o), .dst_rdy_i(dst_rdy_i));
+
+endmodule // ll8_shortfifo
diff --git a/usrp2/control_lib/newfifo/ll8_to_fifo19.v b/usrp2/control_lib/newfifo/ll8_to_fifo19.v
new file mode 100644
index 000000000..af3b91afb
--- /dev/null
+++ b/usrp2/control_lib/newfifo/ll8_to_fifo19.v
@@ -0,0 +1,73 @@
+
+module ll8_to_fifo19
+  (input clk, input reset, input clear,
+   input [7:0] ll_data,
+   input ll_sof_n,
+   input ll_eof_n,
+   input ll_src_rdy_n,
+   output ll_dst_rdy_n,
+
+   output [18:0] f19_data,
+   output f19_src_rdy_o,
+   input f19_dst_rdy_i );
+   
+   localparam XFER_EMPTY       = 0;
+   localparam XFER_HALF        = 1;
+   localparam XFER_HALF_WRITE  = 3;
+   
+   // Why anybody would use active low in an FPGA is beyond me...
+   wire  ll_sof      = ~ll_sof_n;
+   wire  ll_eof      = ~ll_eof_n;
+   wire  ll_src_rdy  = ~ll_src_rdy_n;
+   wire  ll_dst_rdy;
+   assign    ll_dst_rdy_n  = ~ll_dst_rdy;
+   
+   wire  xfer_out 	   = f19_src_rdy_o & f19_dst_rdy_i;
+   wire  xfer_in 	   = ll_src_rdy & ll_dst_rdy; 
+   
+   reg 	 hold_sof;
+   wire  f19_sof, f19_eof, f19_occ;
+   
+   reg [1:0] state;
+   reg [7:0] hold_reg;
+   
+   always @(posedge clk)
+     if(ll_src_rdy & (state==XFER_EMPTY))
+       hold_reg 	      <= ll_data;
+   
+   always @(posedge clk)
+     if(ll_sof & (state==XFER_EMPTY))
+       hold_sof 	      <= 1;
+     else if(xfer_out)
+       hold_sof 	      <= 0;
+   
+   always @(posedge clk)
+     if(reset | clear)
+       state 		      <= XFER_EMPTY;
+     else
+       case(state)
+	 XFER_EMPTY :
+	   if(ll_src_rdy)
+	     if(ll_eof)
+	       state 	      <= XFER_HALF_WRITE;
+	     else
+	       state 	      <= XFER_HALF;
+	 XFER_HALF :
+	   if(ll_src_rdy & f19_dst_rdy_i)
+	       state 	      <= XFER_EMPTY;
+         XFER_HALF_WRITE :
+	   if(f19_dst_rdy_i)
+	     state 	<= XFER_EMPTY;
+       endcase // case (state)
+      
+   assign ll_dst_rdy 	 = (state==XFER_EMPTY) | ((state==XFER_HALF)&f19_dst_rdy_i);
+   assign f19_src_rdy_o  = (state==XFER_HALF_WRITE) | ((state==XFER_HALF)&ll_src_rdy);
+   
+   assign f19_sof 	 = hold_sof | (ll_sof & (state==XFER_HALF));
+   assign f19_eof 	 = (state == XFER_HALF_WRITE) | ll_eof;
+   assign f19_occ 	 = (state == XFER_HALF_WRITE);
+   
+   assign f19_data 	 = {f19_occ,f19_eof,f19_sof,hold_reg,ll_data};
+      
+endmodule // ll8_to_fifo19
+
diff --git a/usrp2/control_lib/newfifo/ll8_to_fifo36.v b/usrp2/control_lib/newfifo/ll8_to_fifo36.v
new file mode 100644
index 000000000..108daa903
--- /dev/null
+++ b/usrp2/control_lib/newfifo/ll8_to_fifo36.v
@@ -0,0 +1,97 @@
+
+module ll8_to_fifo36
+  (input clk, input reset, input clear,
+   input [7:0] ll_data,
+   input ll_sof_n,
+   input ll_eof_n,
+   input ll_src_rdy_n,
+   output ll_dst_rdy_n,
+
+   output [35:0] f36_data,
+   output f36_src_rdy_o,
+   input f36_dst_rdy_i );
+
+   wire f36_write    = f36_src_rdy_o & f36_dst_rdy_i;
+      
+   // Why anybody would use active low in an FPGA is beyond me...
+   wire  ll_sof      = ~ll_sof_n;
+   wire  ll_eof      = ~ll_eof_n;
+   wire  ll_src_rdy  = ~ll_src_rdy_n;
+   wire  ll_dst_rdy;
+   assign    ll_dst_rdy_n = ~ll_dst_rdy;
+
+   reg 	 f36_sof, f36_eof;
+   reg [1:0] f36_occ;
+   
+   
+   reg [2:0] state;
+   reg [7:0] dat0, dat1, dat2, dat3;
+
+   always @(posedge clk)
+     if(ll_src_rdy & ((state==0)|f36_write))
+       f36_sof <= ll_sof;
+
+   always @(posedge clk)
+     if(ll_src_rdy & ((state !=4)|f36_write))
+       f36_eof <= ll_eof;
+
+   always @(posedge clk)
+     if(ll_eof)
+       f36_occ <= state[1:0] + 1;
+     else
+       f36_occ <= 0;
+   
+   always @(posedge clk)
+     if(reset)
+       state   <= 0;
+     else
+       if(ll_src_rdy)
+	 case(state)
+	   0 : 
+	     if(ll_eof)
+	       state <= 4;
+	     else
+	       state <= 1;
+	   1 : 
+	     if(ll_eof)
+	       state <= 4;
+	     else
+	       state <= 2;
+	   2 : 
+	     if(ll_eof)
+	       state <= 4;
+	     else 
+	       state <= 3;
+	   3 : state <= 4;
+	   4 : 
+	     if(f36_dst_rdy_i)
+	       if(ll_eof)
+		 state 	   <= 4;
+	       else
+		 state 	   <= 1;
+	 endcase // case(state)
+       else
+	 if(f36_write)
+	   state 	   <= 0;
+
+   always @(posedge clk)
+     if(ll_src_rdy & (state==3))
+       dat3 		   <= ll_data;
+
+   always @(posedge clk)
+     if(ll_src_rdy & (state==2))
+       dat2 		   <= ll_data;
+
+   always @(posedge clk)
+     if(ll_src_rdy & (state==1))
+       dat1 		   <= ll_data;
+
+   always @(posedge clk)
+     if(ll_src_rdy & ((state==0) | f36_write))
+       dat0 		   <= ll_data;
+   
+   assign    ll_dst_rdy     = f36_dst_rdy_i | (state != 4);
+   assign    f36_data 	    = {f36_occ,f36_eof,f36_sof,dat0,dat1,dat2,dat3};  // FIXME endianess
+   assign    f36_src_rdy_o  = (state == 4);
+      
+endmodule // ll8_to_fifo36