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

//  JUMP_VECTOR

//  - fetch 32 bit vector into selector:offset and jump to it

//

//

//  2009,2010,2012  Robert Finch

//  robfinch[remove]@opencores.org

//  Stratford

//

//

// 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/>.    

//

//  Verilog 

//

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

//

JUMP_VECTOR1:

        begin

                lock_o <= 1'b1;

                cyc_o <= 1'b1;

                stb_o <= 1'b1;

                we_o  <= 1'b0;

                adr_o <= ea;            // ea set by EACALC

                state <= JUMP_VECTOR2;

        end

JUMP_VECTOR2:

        if (ack_i) begin

                ea    <= ea_inc;

                offset[7:0] <= dat_i;

                stb_o <= 1'b0;

                state <= JUMP_VECTOR3;

        end

JUMP_VECTOR3:

        begin

                stb_o <= 1'b1;

                adr_o <= ea;

                state <= JUMP_VECTOR4;

        end

JUMP_VECTOR4:

        if (ack_i) begin

                ea    <= ea_inc;

                stb_o <= 1'b0;

                offset[15:8] <= dat_i;

                state <= JUMP_VECTOR5;

        end

JUMP_VECTOR5:

        begin

                stb_o <= 1'b1;

                adr_o <= ea;

                state <= JUMP_VECTOR6;

        end

JUMP_VECTOR6:

        if (ack_i) begin

                ea    <= ea_inc;

                selector[7:0] <= dat_i;

                stb_o <= 1'b0;

                state <= JUMP_VECTOR7;

        end

JUMP_VECTOR7:

        begin

                stb_o <= 1'b1;

                adr_o <= ea;

                state <= JUMP_VECTOR8;

        end

JUMP_VECTOR8:

        if (ack_i) begin

                cyc_o <= 1'b0;

                stb_o <= 1'b0;

                selector[15:8] <= dat_i;

                state <= JUMP_VECTOR9;

        end

JUMP_VECTOR9:

        begin

                ip <= offset;

                cs <= selector;

                state <= IFETCH;

        end