From 985d82f1c24983cf6809a052cb190ba55f673f30 Mon Sep 17 00:00:00 2001
From: Matt Ettus <matt@ettus.com>
Date: Thu, 3 Mar 2011 18:00:58 -0800
Subject: all: removed old unused fifos

---
 usrp2/extramfifo/fifo_extram.v | 188 -----------------------------------------
 1 file changed, 188 deletions(-)
 delete mode 100644 usrp2/extramfifo/fifo_extram.v

(limited to 'usrp2/extramfifo/fifo_extram.v')

diff --git a/usrp2/extramfifo/fifo_extram.v b/usrp2/extramfifo/fifo_extram.v
deleted file mode 100644
index 4e1f40371..000000000
--- a/usrp2/extramfifo/fifo_extram.v
+++ /dev/null
@@ -1,188 +0,0 @@
-
-// Everything on sram_clk
-
-module fifo_extram
-  (input reset, input clear,
-   input [17:0] datain, input src_rdy_i, output dst_rdy_o, output [15:0] space, input [15:0] occ_in,
-   output [17:0] dataout, output src_rdy_o, input dst_rdy_i, output [15:0] occupied, input [15:0] space_in,
-   input sram_clk, output [18:0] sram_a, inout [17:0] sram_d, output sram_we,
-   output [1:0] sram_bw, output sram_adv, output sram_ce, output sram_oe, 
-   output sram_mode, output sram_zz);
-
-   localparam AWIDTH   = 19; // 1 MB in x18
-   localparam RAMSIZE  = ((1<<AWIDTH) - 1);
-
-   wire   do_store, do_retrieve;
-   reg [1:0]  do_store_del, do_retr_del;
-   
-   reg [AWIDTH-1:0] addr_retrieve, addr_store;
-   always @(posedge sram_clk)
-     if(reset | clear)
-       addr_retrieve <= 0;
-     else if (do_retrieve)
-       addr_retrieve <= addr_retrieve + 1;
-   
-   always @(posedge sram_clk)
-     if(reset | clear)
-       addr_store    <= 0;
-     else if(do_store)
-       addr_store    <= addr_store + 1;
-
-   //wire [AWIDTH-1:0] fullness = (addr_store - addr_retrieve);
-   reg [AWIDTH-1:0] fullness;
-   always @(posedge sram_clk)
-     if(reset | clear)
-       fullness      <= 0;
-     else if(do_store)
-       fullness      <= fullness + 1;
-     else if(do_retrieve)
-       fullness      <= fullness - 1;
-   
-   //   wire        empty  = (fullness == 0);
-   //wire        full   = (fullness == RAMSIZE); // 19'h7FF);
-   reg 		    empty, full;
-   
-   //  The math in the following functions is 'AWIDTH wide.  Use
-   //  continuous assignments to prevent the numbers from being
-   //  promoted to 32-bit (which would make it wrap wrong).
-   //
-   wire [AWIDTH-1:0] addr_retrieve_p1, addr_store_p2;
-   assign addr_retrieve_p1 = addr_retrieve + 1;
-   assign addr_store_p2 = addr_store + 2;
-
-   always @(posedge sram_clk)
-     if(reset | clear)
-       empty 	     <= 1;
-     else if(do_store)
-       empty 	     <= 0;
-     else if(do_retrieve & (/*(addr_retrieve + 1)*/ addr_retrieve_p1 == addr_store))
-       empty 	     <= 1;
-   
-   always @(posedge sram_clk)
-     if(reset | clear)
-       full 	     <= 0;
-     else if(do_retrieve)
-       full 	     <= 0;
-     else if(do_store & (/*(addr_store+2)*/ addr_store_p2 == addr_retrieve))
-       full <= 1;
-
-   reg 	       can_store;
-   always @*
-     if(full | ~src_rdy_i)
-       can_store 	  <= 0;
-     else if(do_store_del == 0)
-       can_store 	  <= 1;
-     else if((do_store_del == 1) || (do_store_del == 2))
-       can_store 	  <= (occ_in > 1);
-     else
-       can_store 	  <= (occ_in > 2);
-     
-   reg 	       can_retrieve;
-   always @*
-     if(empty | ~dst_rdy_i)
-       can_retrieve 	     <= 0;
-     else if(do_retr_del == 0)
-       can_retrieve 	     <= 1;
-     else if((do_retr_del == 1) || (do_retr_del == 2))
-       can_retrieve 	     <= (space_in > 1);
-     else
-       can_retrieve 	     <= (space_in > 2);
-   
-   reg [1:0]  state;
-   localparam IDLE_STORE_NEXT  = 0;
-   localparam STORE 	       = 1;
-   localparam IDLE_RETR_NEXT   = 2;
-   localparam RETRIEVE 	       = 3;
-   
-   reg [7:0]  countdown;
-   wire       countdown_done 		   = (countdown == 0);
-
-   localparam CYCLE_SIZE 		   = 6;
-   
-   assign        do_store 		   = can_store & (state == STORE);
-   assign        do_retrieve 		   = can_retrieve & (state == RETRIEVE);
-   always @(posedge sram_clk)
-     if(reset)
-       do_store_del 			  <= 0;
-     else
-       do_store_del 			  <= {do_store_del[0],do_store};
-   
-   always @(posedge sram_clk) 
-     if(reset)
-       do_retr_del <= 0;
-     else
-       do_retr_del <= {do_retr_del[0],do_retrieve};
-
-   always @(posedge sram_clk)
-     if(reset | clear)
-       begin
-	  state 			  <= IDLE_STORE_NEXT;
-	  countdown 			  <= 0;
-       end
-     else
-       case(state)
-	 IDLE_STORE_NEXT :
-	   if(can_store)
-	     begin
-		state 	  <= STORE;
-		countdown <= CYCLE_SIZE;
-	     end
-	   else if(can_retrieve)
-	     begin
-		state 	  <= RETRIEVE;
-		countdown <= CYCLE_SIZE;
-	     end
-	 STORE :
-	   if(~can_store | (can_retrieve & countdown_done))
-	     state <= IDLE_RETR_NEXT;
-	   else if(~countdown_done)
-	     countdown <= countdown - 1;
-	 IDLE_RETR_NEXT :
-	   if(can_retrieve)
-	     begin
-		state 	  <= RETRIEVE;
-		countdown <= CYCLE_SIZE;
-	     end
-	   else if(can_store)
-	     begin
-		state 	  <= STORE;
-		countdown <= CYCLE_SIZE;
-	     end
-	 RETRIEVE :
-	   if(~can_retrieve | (can_store & countdown_done))
-	     state <= IDLE_STORE_NEXT;
-	   else if(~countdown_done)
-	     countdown <= countdown - 1;
-       endcase // case (state)
-
-   // RAM wires
-   assign sram_bw      = 0;
-   assign sram_adv     = 0;
-   assign sram_mode    = 0;
-   assign sram_zz      = 0;
-   assign sram_ce      = 0;
-
-   assign sram_a       = (state==STORE) ? addr_store : addr_retrieve;
-   assign sram_we      = ~do_store;
-   assign sram_oe      = ~do_retr_del[1];
-   assign my_oe        = do_store_del[1] & sram_oe;
-   assign sram_d       = my_oe ? datain : 18'bz;
-   
-   // FIFO wires
-   assign dataout      = sram_d;
-   assign src_rdy_o    = do_retr_del[1];
-   assign dst_rdy_o    = do_store_del[1];
-   
-endmodule // fifo_extram
-
-
-   //wire        have_1 		   = (fullness == 1);
-   //wire        have_2 		   = (fullness == 2);
-   //wire        have_atleast_1 	   = ~empty;
-   //wire        have_atleast_2 	   = ~(empty | have_1);
-   //wire        have_atleast_3 	   = ~(empty | have_1 | have_2);   
-   //wire        full_minus_1 	   = (fullness == (RAMSIZE-1)); // 19'h7FE);
-   //wire        full_minus_2 	   = (fullness == (RAMSIZE-2)); // 19'h7FD);
-   //wire        spacefor_atleast_1  = ~full;
-   //wire        spacefor_atleast_2  = ~(full | full_minus_1);
-   //wire        spacefor_atleast_3  = ~(full | full_minus_1 | full_minus_2);
-- 
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