Subversion Repositories rtf8088

//=============================================================================

//  CALL NEAR

//

//

//  2009-2013 Robert Finch

//  Stratford

//  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/>.    

//

//

//=============================================================================

//

CALL:

        begin

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

                lock_o <= 1'b1;

                state <= CALL1;

        end

CALL1:

        if (ack_i) begin

                state <= CALL2;

                pause_stack_push();

        end

CALL2:

        begin

                state <= CALL3;

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

        end

CALL3:

        if (ack_i) begin

                nack();

                lock_o <= 1'b0;

                ip <= ip + disp16;

                state <= IFETCH;

        end