//=============================================================================
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//=============================================================================
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// STOSB,STOSW
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// STOSB,STOSW
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// Store string data to memory.
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// Store string data to memory.
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//
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//
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//
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//
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// 2009-2012 Robert Finch
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// 2009-2013 Robert Finch
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// Stratford
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// Stratford
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// robfinch<remove>@opencores.org
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// robfinch<remove>@finitron.ca
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//
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//
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//
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//
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// This source file is free software: you can redistribute it and/or modify
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// This source file is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// it under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or
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// by the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// (at your option) any later version.
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//
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//
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// This source file is distributed in the hope that it will be useful,
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// This source file is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// GNU General Public License for more details.
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//
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//
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// You should have received a copy of the GNU General Public License
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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//
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//=============================================================================
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//=============================================================================
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//
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//
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STOS:
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STOS:
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`include "check_for_ints.v"
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if (pe_nmi) begin
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rst_nmi <= 1'b1;
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int_num <= 8'h02;
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ir <= `NOP;
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state <= INT2;
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end
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else if (irq_i & ie) begin
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ir <= `NOP;
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state <= INTA0;
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end
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else if (w && (di==16'hFFFF)) begin
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else if (w && (di==16'hFFFF)) begin
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ir <= `NOP;
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ir <= `NOP;
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int_num <= 8'd13;
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int_num <= 8'd13;
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state <= INT1;
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state <= INT2;
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end
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end
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else if (repdone)
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else if (repdone)
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state <= IFETCH;
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state <= IFETCH;
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else begin
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else begin
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if (!cyc_o) begin
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if (!cyc_o) begin
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cyc_type <= `CT_WRMEM;
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cyc_type <= `CT_WRMEM;
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lock_o <= w;
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lock_o <= w;
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cyc_o <= 1'b1;
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cyc_o <= 1'b1;
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stb_o <= 1'b1;
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stb_o <= 1'b1;
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we_o <= 1'b1;
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we_o <= 1'b1;
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adr_o <= esdi;
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adr_o <= esdi;
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dat_o <= (w & df) ? ah : al;
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dat_o <= (w & df) ? ah : al;
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end
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end
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else if (ack_i) begin
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else if (ack_i) begin
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cyc_type <= `CT_PASSIVE;
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cyc_type <= `CT_PASSIVE;
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if (repz|repnz) begin
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if (repz|repnz) begin
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state <= w ? STOS1 : STOS;
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state <= w ? STOS1 : STOS;
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cx <= cx_dec;
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cx <= cx_dec;
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end
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end
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else
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else
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state <= w ? STOS1 : IFETCH;
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state <= w ? STOS1 : IFETCH;
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lock_o <= w;
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lock_o <= w;
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cyc_o <= w;
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cyc_o <= w;
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stb_o <= 1'b0;
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stb_o <= 1'b0;
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we_o <= 1'b0;
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we_o <= 1'b0;
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if (df)
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if (df)
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di <= di_dec;
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di <= di_dec;
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else
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else
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di <= di_inc;
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di <= di_inc;
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end
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end
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end
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end
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STOS1:
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STOS1:
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begin
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begin
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cyc_type <= `CT_WRMEM;
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cyc_type <= `CT_WRMEM;
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cyc_o <= 1'b1;
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cyc_o <= 1'b1;
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stb_o <= 1'b1;
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stb_o <= 1'b1;
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we_o <= 1'b1;
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we_o <= 1'b1;
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adr_o <= esdi;
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adr_o <= esdi;
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dat_o <= df ? al : ah;
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dat_o <= df ? al : ah;
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state <= STOS2;
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state <= STOS2;
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end
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end
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STOS2:
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STOS2:
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if (ack_i) begin
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if (ack_i) begin
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cyc_type <= `CT_PASSIVE;
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cyc_type <= `CT_PASSIVE;
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if (repz|repnz)
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if (repz|repnz)
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state <= STOS;
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state <= STOS;
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else
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else
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state <= IFETCH;
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state <= IFETCH;
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lock_o <= 1'b0;
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lock_o <= 1'b0;
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cyc_o <= 1'b0;
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cyc_o <= 1'b0;
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stb_o <= 1'b0;
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stb_o <= 1'b0;
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we_o <= 1'b0;
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we_o <= 1'b0;
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if (df)
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if (df)
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di <= di_dec;
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di <= di_dec;
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else
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else
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di <= di_inc;
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di <= di_inc;
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end
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end
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