Subversion Repositories rtf8088

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// CALL NEAR Indirect

//

// 2009-2012 Robert Finch

// robfinch<remove>@finitron.ca

//

// This source file 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.                                      

//                                                                          

// This source file 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 General Public License for more details.                             

//                                                                          

// You should have received a copy of the GNU General Public License        

// along with this program.  If not, see <http://www.gnu.org/licenses/>.    

//

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//

CALL_IN:

        if (!cyc_o)

                write(`CT_WRMEM,sssp,ip[15:8]);

        else if (ack_i) begin

                pause_stack_push();

                state <= CALL_IN1;

        end

CALL_IN1:

        if (!stb_o)

                write(`CT_WRMEM,sssp,ip[7:0]);

        else if (ack_i) begin

                nack();

                ea <= {cs,`SEG_SHIFT}+b;

                if (mod==2'b11) begin

                        ip <= b;

                        state <= IFETCH;

                end

                else

                        state <= CALL_IN2;

        end

CALL_IN2:

        if (!cyc_o)

                read(`CT_RDMEM,ea);

        else if (ack_i) begin

                pause_read();

                state <= CALL_IN3;

                b[7:0] <= dat_i;

        end

CALL_IN3:

        if (!stb_o)

                read(`CT_RDMEM,ea_inc);

        else if (ack_i) begin

                nack();

                state <= CALL_IN4;

                b[15:8] <= dat_i;

        end

CALL_IN4:

        begin

                state <= IFETCH;

                ip <= b;

        end