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/* $Id: aeMB2_tpsram.v,v 1.3 2008-04-26 17:57:43 sybreon Exp $
** 
** AEMB2 EDK 6.2 COMPATIBLE CORE
** Copyright (C) 2004-2008 Shawn Tan <shawn.tan@aeste.net>
** 
** This file is part of AEMB.
**
** AEMB is free software: you can redistribute it and/or modify it
** under the terms of the GNU Lesser General Public License as
** published by the Free Software Foundation, either version 3 of the
** License, or (at your option) any later version.
**
** AEMB is distributed in the hope that it will be useful, but WITHOUT
** ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
** or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
** Public License for more details.
**
** You should have received a copy of the GNU Lesser General Public
** License along with AEMB. If not, see <http:**www.gnu.org/licenses/>.
*/
/** 
 * @file aeMB2_tpsram.v
 * @brief On-chip two-port synchronous SRAM. 
 
 * Port A is used for writing and port B is used for reading
 * ONLY. Output buffers are cleared during reset. NOTE: Quartus
 * (<=7.2) does not infer a correct SYNCRAM block with read enable.
 
 */
 
module aeMB2_tpsram (/*AUTOARG*/
   // Outputs
   dat_o, xdat_o,
   // Inputs
   adr_i, dat_i, wre_i, ena_i, rst_i, clk_i, xadr_i, xdat_i, xwre_i,
   xena_i, xrst_i, xclk_i
   ) ;
   parameter AW = 8; // 256
   parameter DW = 32; // x32
 
   // PORT A - WRITE
   output [DW-1:0] dat_o;  
   input [AW-1:0]  adr_i;
   input [DW-1:0]  dat_i;
   input 	   wre_i,		   
		   ena_i,
		   rst_i,
		   clk_i;
 
   // PORT X - READ
   output [DW-1:0] xdat_o;  
   input [AW-1:0]  xadr_i;
   input [DW-1:0]  xdat_i;
   input 	   xwre_i,
		   xena_i,
		   xrst_i,
		   xclk_i;     
 
   /*AUTOREG*/
   // Beginning of automatic regs (for this module's undeclared outputs)
   reg [DW-1:0]		xdat_o;
   // End of automatics
   reg [DW:1] 		rRAM [(1<<AW)-1:0];
   reg [AW:1] 		rADR;
 
   always @(posedge clk_i)    
     if (wre_i) rRAM[adr_i] <= #1 dat_i;	    
 
   always @(posedge xclk_i)
     if (xrst_i)
       /*AUTORESET*/
       // Beginning of autoreset for uninitialized flops
       xdat_o <= {(1+(DW-1)){1'b0}};
       // End of automatics
     else if (xena_i) 
       xdat_o <= #1 rRAM[xadr_i];   
 
   assign 		dat_o = {(DW){1'bX}}; // tieoff unused outputs
 
   // --- SIMULATION ONLY ------------------------------------
   // synopsys translate_off
   integer i;
   initial begin
      for (i=0; i<(1<<AW); i=i+1) begin
	 rRAM[i] <= $random;	 
      end
   end
   // synopsys translate_on
 
endmodule // aeMB2_tpsram
 
/*
 $Log: not supported by cvs2svn $
 Revision 1.2  2008/04/26 01:09:06  sybreon
 Passes basic tests. Minor documentation changes to make it compatible with iverilog pre-processor.
 
 Revision 1.1  2008/04/20 16:33:39  sybreon
 Initial import.
*/