Subversion Repositories iso7816_3_master

/*

Author: Sebastien Riou (acapola)

Creation date: 17:16:40 01/09/2011

$LastChangedDate: 2011-02-13 16:20:10 +0100 (Sun, 13 Feb 2011) $

$LastChangedBy: acapola $

$LastChangedRevision: 15 $

$HeadURL: file:///svn/iso7816_3_master/iso7816_3_master/trunk/sources/Iso7816_3_Master.v $

This file is under the BSD licence:

Copyright (c) 2011, Sebastien Riou

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

The names of contributors may not be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR

CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

`default_nettype none

module Iso7816_3_Master(

    input wire nReset,

    input wire clk,

         input wire [15:0] clkPerCycle,//not supported yet

         input wire startActivation,//Starts activation sequence

         input wire startDeactivation,//Starts deactivation sequence

    input wire [7:0] dataIn,

    input wire nWeDataIn,

         input wire [12:0] cyclesPerEtu,

    output reg [7:0] dataOut,

    input wire nCsDataOut,

    output wire [7:0] statusOut,

    input wire nCsStatusOut,

         output reg isActivated,//set to high by activation sequence, set to low by deactivation sequence

         output wire useIndirectConvention,

         output wire tsError,//high if TS character is wrong

         output wire tsReceived,

         output wire atrIsEarly,//high if TS received before 400 cycles after reset release

         output wire atrIsLate,//high if TS is still not received after 40000 cycles after reset release

         //ISO7816 signals

    inout wire isoSio,

         output wire isoClk,

         output reg isoReset,

         output reg isoVdd

    );

wire txRun,txPending, rxRun, rxStartBit, isTx, overrunErrorFlag, frameErrorFlag, bufferFull;

assign {txRun, txPending, rxRun, rxStartBit, isTx, overrunErrorFlag, frameErrorFlag, bufferFull} = statusOut;

wire serialOut;

assign isoSio = isTx ? serialOut : 1'bz;

pullup(isoSio);

wire comClk;

wire stopBit2=1'b1;//0: 1 stop bit, 1: 2 stop bits 

wire msbFirst = useIndirectConvention;//if 1, bits order is: startBit, b7, b6, b5...b0, parity

wire oddParity = 1'b0;//if 1, parity bit is such that data+parity have an odd number of 1

wire sioHighValue = ~useIndirectConvention;//apply only to data bits

wire [7:0] uart_dataOut;

wire [7:0] uart_dataIn = sioHighValue ? dataIn : ~dataIn;

always @(*) dataOut = sioHighValue ? uart_dataOut : ~uart_dataOut;

        HalfDuplexUartIf #(

                .DIVIDER_WIDTH(1'b1),

                .CLOCK_PER_BIT_WIDTH(4'd13)

                )

        uart (

                .nReset(nReset),

                .clk(clk),

                .clkPerCycle(1'b0),

                .dataIn(uart_dataIn),

                .nWeDataIn(nWeDataIn),

                .clocksPerBit(cyclesPerEtu),

                .stopBit2(stopBit2),

                .oddParity(oddParity),

      .msbFirst(msbFirst),

           .dataOut(uart_dataOut),

                .nCsDataOut(nCsDataOut),

                .statusOut(statusOut),

                .nCsStatusOut(nCsStatusOut),

                .serialIn(isoSio),

                .serialOut(serialOut),

                .comClk(comClk)

        );

        reg isoClkEn;

        assign isoClk = isoClkEn ? comClk : 1'b0;

reg [16:0] resetCnt;

reg waitTs;

assign tsReceived = ~waitTs;

reg [7:0] ts;

assign atrIsEarly = ~waitTs & (resetCnt<(16'h100+16'd400));

assign atrIsLate = resetCnt>(16'h100+16'd40000);

assign useIndirectConvention = ~waitTs & (ts==8'h3F);

assign tsError = ~waitTs & (ts!=8'h3B) & ~useIndirectConvention;

always @(posedge comClk, negedge nReset) begin

        if(~nReset) begin

                isoClkEn <= 1'b0;

                resetCnt<=16'b0;

                waitTs<=1'b1;

                isoReset <= 1'b0;

                isoVdd <= 1'b0;

                isActivated <= 1'b0;

        end else if(isActivated) begin

                if(waitTs) begin

                        if(statusOut[0]) begin

                                waitTs<=1'b0;

                                case(dataOut)

                                        8'h3B: ts<=dataOut;

                                        8'h03: ts<=8'h3F;

                                        default: ts<=dataOut;

                                endcase

                        end

                        resetCnt<=resetCnt+1;

                end

                if(startDeactivation) begin

                        isoVdd <= 1'b0;

                        isoClkEn <= 1'b0;

                        isoReset <= 1'b0;

                        resetCnt<=16'b0;

                        isActivated <= 1'b0;

                end

        end else begin

                if(startActivation) begin

                        waitTs <= 1'b1;

                        isoVdd <= 1'b1;

                        isoClkEn <= 1'b1;

                        if(16'h100 == resetCnt) begin

                                isActivated <=1'b1;

                                isoReset <=1'b1;

                        end else

                                resetCnt<=resetCnt + 1;

                end else begin

                        resetCnt<=16'b0;

                end

        end

end

endmodule

`default_nettype wire