Subversion Repositories sdhc-sc-core

//
// file: SdCardModel.sv
// author: Rainer Kastl
//
// Models a SDCard for verification
// 

const logic cActivated = 1;
const logic cInactivated = 0;

include "../../unitSdCardModel/src/Crc.sv";
include "../../unitSdCardModel/src/SdCommand.sv";
include "../../unitSdCardModel/src/SdData.sv";

class SDCard;
        local virtual ISdCmd.Card ICmd;

        local SDCardState state;
        local RCA_t rca;
        local SDCommandToken recvcmd;
        local logic CCS;
        local Mode_t mode;
        local DataMode_t datamode;

        local event CmdReceived, InitDone;

        function new(virtual ISdCmd CmdInterface, event CmdReceived, event InitDone);
                ICmd = CmdInterface;
                state = new();
                this.CmdReceived = CmdReceived;
                this.InitDone = InitDone;
                this.CCS = 1;
                rca = 0;
                mode = standard;
                ICmd.cb.Data <= 'z;
        endfunction

        task reset();
        endtask

        // Receive a command token and handle it
        task recv();
                ICmd.cb.Cmd <= 'z;

                repeat(8) @ICmd.cb;

                recvcmd = new();

                wait(ICmd.cb.Cmd == 0);
                // Startbit
                recvcmd.startbit = ICmd.cb.Cmd;

                @ICmd.cb;
                // Transbit
                recvcmd.transbit = ICmd.cb.Cmd;

                // CmdID
                for (int i = 5; i >= 0; i--) begin
                        @ICmd.cb;
                        recvcmd.id[i] = ICmd.cb.Cmd;
                end

                // Arg
                for (int i = 31; i >= 0; i--) begin
                        @ICmd.cb;
                        recvcmd.arg[i] = ICmd.cb.Cmd;
                end

                // CRC
                for (int i = 6; i >= 0; i--) begin
                        @ICmd.cb;
                        recvcmd.crc7[i] = ICmd.cb.Cmd;
                end

                // Endbit
                @ICmd.cb;
                recvcmd.endbit = ICmd.cb.Cmd;

                recvcmd.checkFromHost();
                -> CmdReceived;
        endtask

        task automatic init();
                SDCommandR7 voltageresponse;
                SDCommandR1 response;
                SDCommandR3 acmd41response;
                SDCommandR2 cidresponse;
                SDOCR ocr;
                SDCommandR6 rcaresponse;
                logic data[$];
                SdData sddata;
                
                // expect CMD0 so that state is clear
                recv();
                assert(recvcmd.id == cSdCmdGoIdleState);
                
                // expect CMD8: voltage and SD 2.00 compatible
                recv();
                assert(recvcmd.id == cSdCmdSendIfCond); 
                assert(recvcmd.arg[12:8] == 'b0001); // Standard voltage

                // respond with R7: we are SD 2.00 compatible and compatible to the
                // voltage
                voltageresponse = new(recvcmd.arg);
                voltageresponse.send(ICmd);

                recvCMD55(0);

                // expect ACMD41 with HCS = 1
                recv();
                assert(recvcmd.id == cSdCmdACMD41);
                assert(recvcmd.arg == cSdArgACMD41HCS);

                // respond with R3
                ocr = new(CCS, cSdVoltageWindow);
                acmd41response = new(ocr);
                acmd41response.send(ICmd);              
                
                recvCMD55(0);

                // expect ACMD41 with HCS = 1
                recv();
                assert(recvcmd.id == cSdCmdACMD41);
                assert(recvcmd.arg == cSdArgACMD41HCS);
                state.AppCmd = 0;

                // respond with R3
                ocr.setBusy(cOCRDone);
                acmd41response = new(ocr);
                acmd41response.send(ICmd);              

                // expect CMD2
                recv();
                assert(recvcmd.id == cSdCmdAllSendCID);

                // respond with R2
                cidresponse = new();
                cidresponse.send(ICmd); 

                // expect CMD3
                recv();
                assert(recvcmd.id == cSdCmdSendRelAdr);

                // respond with R3
                rcaresponse = new(rca, state);
                rcaresponse.send(ICmd);

                // expect CMD7
                recv();
                assert(recvcmd.id == cSdCmdSelCard);
                assert(recvcmd.arg[31:16] == rca);

                // respond with R1, no busy
                state.ReadyForData = 1;
                response = new(cSdCmdSelCard, state);
                response.send(ICmd);

                // expect ACMD51
                recvCMD55(rca);
                recv();
                assert(recvcmd.id == cSdCmdSendSCR);

                // respond with R1
                response = new(cSdCmdSendSCR, state);
                response.send(ICmd);

                repeat(2) @ICmd.cb;

                // send dummy SCR
                for (int i = 0; i < 64; i++)
                        data.push_back(0);
                
                data[63-50] = 1;
                data[63-48] = 1;

                sddata = new(standard, widewidth);
                sddata.send(ICmd, data);

                // expect ACMD6
                recvCMD55(rca);
                recv();
                assert(recvcmd.id == cSdCmdSetBusWidth);
                assert(recvcmd.arg == 'h00000002);

                response = new(cSdCmdSetBusWidth, state);
                response.send(ICmd);

                -> InitDone;

        endtask

        task recvCMD55(RCA_t rca);
                SDCommandR1 response;

                // expect CMD55
                recv();
                assert(recvcmd.id == cSdCmdNextIsACMD);
                assert(recvcmd.arg[31:16] == rca);
                state.recvCMD55();

                // respond with R1
                response = new(cSdCmdNextIsACMD, state);
                response.send(ICmd);    
        endtask
        
        function automatic SDCommandToken getCmd();
                return recvcmd;
        endfunction


        task recvCmd(input SDCommandToken cmd, output SDCommandResponse response);
                case (cmd.id)
                        cSdCmdGoIdleState: reset();
                        default: $display("SDCard: CmdId %d not implemented", cmd.id);
                endcase
        endtask

endclass