// ============================================================================
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// ============================================================================
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// __
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// __
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// \\__/ o\ (C) 2013 Robert Finch, Stratford
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// \\__/ o\ (C) 2013 Robert Finch, Stratford
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// \ __ / All rights reserved.
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// \ __ / All rights reserved.
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// \/_// robfinch<remove>@opencores.org
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// \/_// robfinch<remove>@opencores.org
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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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// RTI processing states for eight bit mode
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// RTI processing states for eight bit mode
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//
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//
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BYTE_RTI9:
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BYTE_RTI9:
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if (unCachedData) begin
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if (unCachedData) begin
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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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sel_o <= 4'hF;
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sel_o <= 4'hF;
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adr_o <= {radr,2'b00};
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adr_o <= {radr,2'b00};
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state <= BYTE_RTI10;
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state <= BYTE_RTI10;
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end
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end
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else if (dhit) begin
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else if (dhit) begin
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cf <= rdat8[0];
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cf <= rdat8[0];
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zf <= rdat8[1];
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zf <= rdat8[1];
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im <= rdat8[2];
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im <= rdat8[2];
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df <= rdat8[3];
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df <= rdat8[3];
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bf <= rdat8[4];
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bf <= rdat8[4];
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vf <= rdat8[6];
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vf <= rdat8[6];
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nf <= rdat8[7];
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nf <= rdat8[7];
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sp <= sp_inc;
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sp <= sp_inc;
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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state <= BYTE_RTI1;
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state <= BYTE_RTI1;
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end
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end
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else
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else
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dmiss <= `TRUE;
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dmiss <= `TRUE;
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BYTE_RTI10:
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BYTE_RTI10:
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if (ack_i) begin
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if (ack_i) begin
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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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sel_o <= 4'h0;
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sel_o <= 4'h0;
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cf <= dati[0];
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cf <= dati[0];
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zf <= dati[1];
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zf <= dati[1];
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im <= dati[2];
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im <= dati[2];
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df <= dati[3];
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df <= dati[3];
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bf <= dati[4];
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bf <= dati[4];
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vf <= dati[6];
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vf <= dati[6];
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nf <= dati[7];
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nf <= dati[7];
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sp <= sp_inc;
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sp <= sp_inc;
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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state <= BYTE_RTI1;
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state <= BYTE_RTI1;
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end
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end
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BYTE_RTI1:
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BYTE_RTI1:
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if (unCachedData) begin
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if (unCachedData) begin
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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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sel_o <= 4'hF;
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sel_o <= 4'hF;
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adr_o <= {radr,2'b00};
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adr_o <= {radr,2'b00};
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state <= RTI2;
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state <= RTI2;
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end
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end
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else if (dhit) begin
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else if (dhit) begin
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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sp <= sp_inc;
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sp <= sp_inc;
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pc[7:0] <= rdat8;
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pc[7:0] <= rdat8;
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state <= BYTE_RTI3;
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state <= BYTE_RTI3;
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end
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end
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else
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else
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dmiss <= `TRUE;
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dmiss <= `TRUE;
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BYTE_RTI2:
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BYTE_RTI2:
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if (ack_i) begin
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if (ack_i) begin
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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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sel_o <= 4'h0;
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sel_o <= 4'h0;
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adr_o <= 34'h0;
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adr_o <= 34'h0;
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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sp <= sp_inc;
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sp <= sp_inc;
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pc[7:0] <= dati;
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pc[7:0] <= dati;
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state <= BYTE_RTI3;
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state <= BYTE_RTI3;
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end
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end
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BYTE_RTI3:
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BYTE_RTI3:
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if (unCachedData) begin
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if (unCachedData) begin
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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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sel_o <= 4'hF;
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sel_o <= 4'hF;
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adr_o <= {radr,2'b00};
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adr_o <= {radr,2'b00};
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state <= BYTE_RTI4;
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state <= BYTE_RTI4;
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end
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end
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else if (dhit) begin
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else if (dhit) begin
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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sp <= sp_inc;
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sp <= sp_inc;
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pc[15:8] <= rdat8;
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pc[15:8] <= rdat8;
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state <= BYTE_RTI5;
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state <= BYTE_RTI5;
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end
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end
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else
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else
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dmiss <= `TRUE;
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dmiss <= `TRUE;
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BYTE_RTI4:
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BYTE_RTI4:
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if (ack_i) begin
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if (ack_i) begin
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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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sel_o <= 4'h0;
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sel_o <= 4'h0;
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adr_o <= 34'h0;
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adr_o <= 34'h0;
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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sp <= sp_inc;
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sp <= sp_inc;
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pc[15:8] <= dati;
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pc[15:8] <= dati;
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state <= BYTE_RTI5;
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state <= BYTE_RTI5;
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end
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end
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BYTE_RTI5:
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BYTE_RTI5:
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if (unCachedData) begin
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if (unCachedData) begin
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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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sel_o <= 4'hF;
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sel_o <= 4'hF;
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adr_o <= {radr,2'b00};
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adr_o <= {radr,2'b00};
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state <= BYTE_RTI6;
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state <= BYTE_RTI6;
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end
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end
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else if (dhit) begin
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else if (dhit) begin
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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sp <= sp_inc;
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sp <= sp_inc;
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pc[23:16] <= rdat8;
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pc[23:16] <= rdat8;
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state <= BYTE_RTI7;
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state <= BYTE_RTI7;
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end
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end
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else
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else
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dmiss <= `TRUE;
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dmiss <= `TRUE;
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BYTE_RTI6:
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BYTE_RTI6:
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if (ack_i) begin
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if (ack_i) begin
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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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sel_o <= 4'h0;
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sel_o <= 4'h0;
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adr_o <= 34'h0;
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adr_o <= 34'h0;
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radr <= {24'h1,sp_inc[7:2]};
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radr <= {spage[31:8],sp_inc[7:2]};
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radr2LSB <= sp_inc[1:0];
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radr2LSB <= sp_inc[1:0];
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sp <= sp_inc;
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sp <= sp_inc;
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pc[23:16] <= dati;
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pc[23:16] <= dati;
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state <= BYTE_RTI7;
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state <= BYTE_RTI7;
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end
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end
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BYTE_RTI7:
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BYTE_RTI7:
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if (unCachedData) begin
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if (unCachedData) begin
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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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sel_o <= 4'hF;
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sel_o <= 4'hF;
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adr_o <= {radr,2'b00};
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adr_o <= {radr,2'b00};
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state <= BYTE_RTI8;
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state <= BYTE_RTI8;
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end
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end
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else if (dhit) begin
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else if (dhit) begin
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pc[31:24] <= rdat8;
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pc[31:24] <= rdat8;
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state <= IFETCH;
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state <= IFETCH;
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end
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end
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else
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else
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dmiss <= `TRUE;
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dmiss <= `TRUE;
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BYTE_RTI8:
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BYTE_RTI8:
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if (ack_i) begin
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if (ack_i) begin
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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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sel_o <= 4'h0;
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sel_o <= 4'h0;
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adr_o <= 34'h0;
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adr_o <= 34'h0;
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pc[31:24] <= dati;
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pc[31:24] <= dati;
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state <= IFETCH;
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state <= IFETCH;
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end
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end
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