Subversion Repositories iso7816_3_master

`timescale 1ns / 1ps

`default_nettype none

//////////////////////////////////////////////////////////////////////////////////

// Author: Sebastien Riou

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

//

// Last change date:    $LastChangedDate: 2011-01-29 11:41:01 +0100 (Sat, 29 Jan 2011) $

// Last changed by:     $LastChangedBy: acapola $

// Last revision:               $LastChangedRevision: 10 $

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

//

//////////////////////////////////////////////////////////////////////////////////

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 wire [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;

        HalfDuplexUartIf #(

                .DIVIDER_WIDTH(1'b1),

                .CLOCK_PER_BIT_WIDTH(4'd13)

                )

        uart (

                .nReset(nReset),

                .clk(clk),

                .clkPerCycle(1'b0),

                .dataIn(dataIn),

                .nWeDataIn(nWeDataIn),

                .clocksPerBit(cyclesPerEtu),

                .dataOut(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;

                                ts<=dataOut;

                        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