udevreadmux.v

USBRTL电路的VHDL和Verilog代码

/* 
This file includes the read and write strobes as well as the
read multiplexor which is specific to the endpoint configuration.
*/


// create endpoint write signals here

assign corecommand =  ( (setuprequest == GETDESCRIPTOR)&&(setuptype == 2'b00) ) || 
		( (setuprequest == SETADDRESS)&&(setuptype == 2'b00) ) ||
		( (setuprequest == SETINTERFACE)&&(setuptype == 2'b00) ) ||
		( (setuprequest == SETCONFIGURATION)&&(setuptype == 2'b00) ) ||
		( (setuprequest == GETINTERFACE)&&(setuptype == 2'b00) ) ||
		( (setuprequest == GETCONFIGURATION)&&(setuptype == 2'b00) ) ||
		( (setuprequest == GETSTATUS)&&(setuptype == 2'b00) );

// wire	endp0noncorecmd =  (~((setuptype == 2'b00) && corecommand) &&	// not a  standard corecommand
//			setupcycle && setupinfovalid && (currentendp == 4'h0));

 wire	endp0noncorecmd =  ((setuptype == 2'b01) &&	// not a  standard corecommand
			setupcycle && setupinfovalid && (currentendp == 4'h0));
// only generate the write if the endpoint is ready, don't overflow

// wire	endp0wr = (currentendp == 4'h0) ? (grabdata && secondbytevalid && endp0wrready && endp0noncorecmd) : 1'b0;

wire    endp0wr = (currentendp == 4'h0) ? ( (grabdata || grabsetup) && secondbytevalid && endp0wrready && ~corecommand) : 1'b0;
// wire	endp0rd = (currentendp == 4'h0) ? (nextdata && endp0noncorecmd) : 1'b0;
 wire endp0rd = (currentendp == 4'h0) ? (nextdata && ~corecommand) : 1'b0; //JAKE
wire	endp1rd = (currentendp == 4'h1) ? nextdata : 1'b0;

// create the read back data, ready signals JAKE

always @(romdevsetupdata or setupcycle or 
        currentendp or bytecount or totalbytecount or
		endp0noncorecmd or
		endp0wrready or endp0wrstall or
		endp0rdready or endp0rddata or endp0rdstall or
		endp1rdready or endp1rddata or endp1rdstall or 
		setupwindex or setuprecipient or setuprequest or setuplength or
		setupwindexin or ourconfiguration or sendzerolengthpkt)
  begin
    case (currentendp)	// synopsys parallel_case full_case
      4'h0:	
	begin
	  if (setuprequest == GETSTATUS)
	    begin
	      case (bytecount)	// synopsys parallel_case full_case
		16'h0: 
		  if (setuprecipient == REQENDPOINT)
		    begin
		      xmitdatabyte[7:1] = 7'h00;
		      case ({setupwindexin,setupwindex[3:0]})	// 1 for rd, endpoint index
			5'h00:	xmitdatabyte[0] = 1'b0;	// endpoint 0 never stalls
			5'h10:	xmitdatabyte[0] = 1'b0;	// endpoint 0 never stalls
			5'h01:	xmitdatabyte[0] = 1'b0;
			5'h11:	xmitdatabyte[0] = endp1rdstall;
			5'h02:	xmitdatabyte[0] = 1'b0;
			5'h12:	xmitdatabyte[0] = 1'b0;  //endp2rdstall;	// non-existent, never stalls
			5'h03:	xmitdatabyte[0] = 1'b0;	// non-existent, never stalls
			5'h13:	xmitdatabyte[0] = 1'b0; //endp3rdstall;
			default: xmitdatabyte[0] = 1'b0;	// no stall
		      endcase
		    end
		  else
		    if (setuprecipient == REQDEVICE)
		      xmitdatabyte = 8'h00;
		    else
		      xmitdatabyte = {6'h00,REMOTEWAKEUP,SELFPOWERED};
		5'h01:
		  xmitdatabyte = 8'h00;	// always all zeros
	      endcase
	    end
	  else if (setuprequest == GETCONFIGURATION)
	    xmitdatabyte = {7'h0,ourconfiguration};
	  else if (setuprequest == GETINTERFACE)
	    xmitdatabyte = currentalternatesetting;	// send alternate interface setting
	  //else if (endp0noncorecmd)
	   else if(~corecommand)
		 xmitdatabyte = endp0rddata;
	  else
	    xmitdatabyte = romdevsetupdata;
	  // last byte if we sent maxpacket or we are sending the last of the length it asked for
	  //		xmitlastbyte = bytecount[7:0] == MAXPACKET0 || 
	  //		                 totalbytecount == setuplength ||
	  //		                 sendzerolengthpkt;
	  endpointrdready = (~corecommand) ? endp0rdready : 1'b1;
	  endpointwrready = (~corecommand) ? endp0wrready : 1'b1;
	  endpointrdstall = (~corecommand) ? endp0rdstall : 1'b0;
	  endpointwrstall = (~corecommand) ? endp0wrstall : 1'b0;
	end
      4'h1:	// this is a read-only endpoint, use 0 for default
	begin
	  xmitdatabyte = endp1rddata;
//	  xmitlastbyte = ((bytecount[7:0] == MAXPACKET1) || ~endp1rdready);
	  endpointrdready = endp1rdready;
	  endpointwrready = 1'b0;
	  endpointrdstall = endp1rdstall;
	  endpointwrstall = 1'b1; //JAKE 1'b1;
	end
 /*     4'h2:	// this is a read-only endpoint, use 0 for default
	begin
	  xmitdatabyte = endp2rddata;
//	  xmitlastbyte = ((bytecount[7:0] == MAXPACKET2) || ~endp2rdready);
	  endpointrdready = endp2rdready;
	  endpointwrready = 1'b0;
	  endpointrdstall = endp2rdstall;
	  endpointwrstall = 1'b1;
	end
      4'h3:	// this is a read-only endpoint, use 0 for default
	begin
	  xmitdatabyte = endp3rddata;
//	  xmitlastbyte = ((bytecount[7:0] == MAXPACKET3) || ~endp3rdready);
	  endpointrdready = endp3rdready;
	  endpointwrready = 1'b0;
	  endpointrdstall = endp3rdstall;
	  endpointwrstall = 1'b1;
	end */

      default:
	begin
	  xmitdatabyte = 8'h00;
//	  xmitlastbyte = 1'b1;
	  endpointrdready = 1'b0;
	  endpointwrready = 1'b0;
	  endpointrdstall = 1'b1;
	  endpointwrstall = 1'b1;
	end
    endcase
  end // always @ (romdevsetupdata or setupcycle or...
  



  always @(currentendp or setuplength or setupcycle or
	   cfgdesclength or sendzerolengthpkt or bytecountd or
	   totalbytecountd or endp1rdready or 
	   xmitlastbyte or ctlst or getcfgdesccycleflag)
    begin
      if (ctlst == CTLDIN)
	xmitlastbyted = 1'b0;
//      else if (xmitlastbyte && ctlst != CTLIDLE)
//	xmitlastbyted = 1'b1;
      else
	case (currentendp) // synopsys parallel_case
	  4'h0 : xmitlastbyted = sendzerolengthpkt || 
	    (bytecountd == MAXPACKET0) ||
	    (totalbytecountd == cfgdesclength && getcfgdesccycleflag) || 
	    (totalbytecountd == setuplength);
	  4'h1 : xmitlastbyted = (bytecountd == MAXPACKET1) || ~endp1rdready;
	  /* 
		   4'h2 : xmitlastbyted = (bytecountd == MAXPACKET2) || ~endp2rdready;
	       4'h3 : xmitlastbyted = (bytecountd == MAXPACKET3) || ~endp3rdready;
      */
	  default : xmitlastbyted = 1'b1;
	endcase // case (currentendp)
    end // always @ (currentendp or setuplength or setupcycle or...