// ============================================================================
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// ============================================================================
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// __
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// __
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// \\__/ o\ (C) 2017-2018 Robert Finch, Waterloo
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// \\__/ o\ (C) 2017-2018 Robert Finch, Waterloo
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// \ __ / All rights reserved.
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// \ __ / All rights reserved.
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// \/_// robfinch<remove>@finitron.ca
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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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// FT64_iexpander.v
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// FT64_iexpander.v
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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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`include ".\FT64_defines.vh"
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`include ".\FT64_defines.vh"
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module FT64_iexpander(cinstr,expand);
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module FT64_iexpander(cinstr,expand);
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input [15:0] cinstr;
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input [15:0] cinstr;
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output reg [47:0] expand;
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output reg [47:0] expand;
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// Maps a subset of registers for compressed instructions.
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// Maps a subset of registers for compressed instructions.
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function [4:0] fnRp;
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function [4:0] fnRp;
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input [2:0] rg;
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input [2:0] rg;
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case(rg)
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case(rg)
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3'd0: fnRp = 5'd1; // return value 0
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3'd0: fnRp = 5'd1; // return value 0
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3'd1: fnRp = 5'd3; // temp
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3'd1: fnRp = 5'd3; // temp
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3'd2: fnRp = 5'd4; // temp
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3'd2: fnRp = 5'd4; // temp
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3'd3: fnRp = 5'd11; // regvar
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3'd3: fnRp = 5'd11; // regvar
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3'd4: fnRp = 5'd12; // regvar
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3'd4: fnRp = 5'd12; // regvar
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3'd5: fnRp = 5'd18; // arg1
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3'd5: fnRp = 5'd18; // arg1
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3'd6: fnRp = 5'd19; // arg2
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3'd6: fnRp = 5'd19; // arg2
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3'd7: fnRp = 5'd20; // arg3
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3'd7: fnRp = 5'd20; // arg3
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endcase
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endcase
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endfunction
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endfunction
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always @*
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always @*
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casez({cinstr[15:12],cinstr[6]})
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casez({cinstr[15:12],cinstr[6]})
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5'b00000: // NOP / ADDI
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5'b00000: // NOP / ADDI
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case(cinstr[4:0])
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case(cinstr[4:0])
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5'd31: begin
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5'd31: begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'b0};
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expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'b0};
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expand[17:13] = cinstr[4:0];
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expand[17:13] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `ADDI;
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expand[5:0] = `ADDI;
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end
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end
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default:
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default:
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5]};
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expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};
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expand[17:13] = cinstr[4:0];
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expand[17:13] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `ADDI;
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expand[5:0] = `ADDI;
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end
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end
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endcase
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endcase
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5'b00010: // SYS
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5'b00010: // SYS
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if (cinstr[4:0]==5'd0) begin
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if (cinstr[4:0]==5'd0) begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[5:0] = `BRK;
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expand[5:0] = `BRK;
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[15:8] = {3'd1,cinstr[11:8],cinstr[5]};
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expand[15:8] = {3'd1,cinstr[11:8],cinstr[5]};
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expand[16] = 1'b0;
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expand[16] = 1'b0;
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expand[19:17] = 3'd0;
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expand[19:17] = 3'd0;
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expand[23:20] = 4'd1;
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expand[23:20] = 4'd1;
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expand[31:24] = 8'd0;
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expand[31:24] = 8'd0;
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end
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end
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// LDI
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// LDI
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else begin
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else begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};
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expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};
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expand[17:13] = cinstr[4:0];
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expand[17:13] = cinstr[4:0];
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expand[12:8] = 5'd0;
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expand[12:8] = 5'd0;
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `ORI;
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expand[5:0] = `ORI;
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end
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end
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5'b00100: // RET / ANDI
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5'b00100: // RET / ANDI
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if (cinstr[4:0]==5'd0) begin
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if (cinstr[4:0]==5'd0) begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[5:0] = `RET;
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expand[5:0] = `RET;
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[12:8] = 5'd31;
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expand[12:8] = 5'd31;
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expand[17:13] = 5'd29;
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expand[17:13] = 5'd29;
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expand[31:18] = {8'd0,cinstr[11:8],cinstr[5],3'd0};
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expand[31:18] = {8'd0,cinstr[11:8],cinstr[5],3'd0};
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end
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end
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else begin
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else begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[5:0] = `ANDI;
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expand[5:0] = `ANDI;
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[12:8] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[17:13] = cinstr[4:0];
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expand[17:13] = cinstr[4:0];
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expand[31:18] = {{11{cinstr[11]}},cinstr[11:8],cinstr[5]};
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expand[31:18] = {{11{cinstr[11]}},cinstr[11:8],cinstr[5]};
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end
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end
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5'b00110: // SHLI
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5'b00110: // SHLI
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = 6'h0F; // immediate mode 0-31
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expand[31:26] = 6'h0F; // immediate mode 0-31
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expand[25:23] = 3'd0; // SHL
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expand[25:23] = 3'd0; // SHL
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expand[22:18] = {cinstr[11:8],cinstr[5]}; // amount
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expand[22:18] = {cinstr[11:8],cinstr[5]}; // amount
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expand[17:13] = cinstr[4:0];
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expand[17:13] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 8'h02; // R2 instruction
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expand[5:0] = 8'h02; // R2 instruction
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end
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end
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5'b01000:
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5'b01000:
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case(cinstr[5:4])
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case(cinstr[5:4])
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2'd0: // SHRI
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2'd0: // SHRI
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = 6'h0F; // shift immediate 0-31
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expand[31:26] = 6'h0F; // shift immediate 0-31
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expand[25:23] = 3'd1; // SHR
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expand[25:23] = 3'd1; // SHR
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expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount
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expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 8'h02; // R2 instruction
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expand[5:0] = 8'h02; // R2 instruction
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end
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end
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2'd1: // ASRI
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2'd1: // ASRI
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = 6'h0F; // shift immediate 0-31
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expand[31:26] = 6'h0F; // shift immediate 0-31
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expand[25:23] = 3'd3; // ASR
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expand[25:23] = 3'd3; // ASR
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expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount
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expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 8'h02; // R2 instruction
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expand[5:0] = 8'h02; // R2 instruction
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end
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end
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2'd2: // ORI
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2'd2: // ORI
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[3]};
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expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[3]};
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `ORI;
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expand[5:0] = `ORI;
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end
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end
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2'd3:
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2'd3:
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case(cinstr[11:10])
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case(cinstr[11:10])
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2'd0: begin
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2'd0: begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = `SUB;
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expand[31:26] = `SUB;
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expand[25:23] = 3'b011; // word size
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expand[25:23] = 3'b011; // word size
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 8'h02; // R2 instruction
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expand[5:0] = 8'h02; // R2 instruction
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end
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end
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2'd1: begin
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2'd1: begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = `AND;
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expand[31:26] = `AND;
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expand[25:23] = 3'b011; // word size
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expand[25:23] = 3'b011; // word size
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 8'h02; // R2 instruction
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expand[5:0] = 8'h02; // R2 instruction
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end
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end
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2'd2: begin
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2'd2: begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = `OR;
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expand[31:26] = `OR;
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expand[25:23] = 3'b011; // word size
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expand[25:23] = 3'b011; // word size
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 8'h02; // R2 instruction
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expand[5:0] = 8'h02; // R2 instruction
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end
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end
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2'd3: begin
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2'd3: begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = `XOR;
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expand[31:26] = `XOR;
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expand[25:23] = 3'b011; // word size
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expand[25:23] = 3'b011; // word size
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[17:13] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[12:8] = fnRp(cinstr[2:0]);
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 8'h02; // R2 instruction
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expand[5:0] = 8'h02; // R2 instruction
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end
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end
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endcase
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endcase
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endcase
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endcase
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5'b01110:
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5'b01110:
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:21] = {{1{cinstr[11]}},{cinstr[11:8],cinstr[5:0]}};
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expand[31:21] = {{1{cinstr[11]}},{cinstr[11:8],cinstr[5:0]}};
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expand[20:18] = 3'd0; // BEQ
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expand[20:18] = 3'd0; // BEQ
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expand[17:8] = 10'd0; // r0==r0
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expand[17:8] = 10'd0; // r0==r0
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `Bcc; // 0x38
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expand[5:0] = `Bcc; // 0x38
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end
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end
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5'b10??0:
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5'b10??0:
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};
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expand[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};
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expand[20:18] = 3'd0; // BEQ
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expand[20:18] = 3'd0; // BEQ
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expand[17:13] = 5'd0; // r0
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expand[17:13] = 5'd0; // r0
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expand[12:8] = cinstr[4:0]; // Ra
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expand[12:8] = cinstr[4:0]; // Ra
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `Bcc;
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expand[5:0] = `Bcc;
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end
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end
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5'b11??0:
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5'b11??0:
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};
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expand[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};
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expand[20:18] = 3'd1; // BNE
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expand[20:18] = 3'd1; // BNE
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expand[17:13] = 5'd0; // r0
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expand[17:13] = 5'd0; // r0
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expand[12:8] = cinstr[4:0]; // Ra
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expand[12:8] = cinstr[4:0]; // Ra
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `Bcc;
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expand[5:0] = `Bcc;
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end
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end
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5'b00001:
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5'b00001:
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = `MOV;
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expand[31:26] = `MOV;
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expand[25:23] = 3'd7; // move current to current
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expand[25:23] = 3'd7; // move current to current
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expand[22:18] = 5'd0; // register set (ignored)
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expand[22:18] = 5'd0; // register set (ignored)
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expand[17:13] = {cinstr[11:8],cinstr[5]};
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expand[17:13] = {cinstr[11:8],cinstr[5]};
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expand[12:8] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 6'h02;
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expand[5:0] = 6'h02;
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end
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end
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5'b00011: // ADD
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5'b00011: // ADD
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:26] = `ADD;
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expand[31:26] = `ADD;
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expand[27:23] = 3'b011; // word size
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expand[27:23] = 3'b011; // word size
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expand[22:18] = cinstr[4:0];
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expand[22:18] = cinstr[4:0];
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expand[17:13] = {cinstr[11:8],cinstr[5]};
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expand[17:13] = {cinstr[11:8],cinstr[5]};
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expand[12:8] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = 6'h02; // R2 instruction
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expand[5:0] = 6'h02; // R2 instruction
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end
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end
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5'b00101: // JALR
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5'b00101: // JALR
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begin
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begin
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expand[47:32] = 16'h0000;
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expand[47:32] = 16'h0000;
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expand[31:18] = 14'd0;
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expand[31:18] = 14'd0;
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expand[17:13] = {cinstr[11:8],cinstr[5]};
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expand[17:13] = {cinstr[11:8],cinstr[5]};
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expand[12:8] = cinstr[4:0];
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expand[12:8] = cinstr[4:0];
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expand[7:6] = 2'b10;
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expand[7:6] = 2'b10;
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expand[5:0] = `JAL;
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expand[5:0] = `JAL;
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end
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end
|
5'b01001: // LH Rt,d[SP]
|
5'b01001: // LH Rt,d[SP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[17:13] = {cinstr[4:0]};
|
expand[17:13] = {cinstr[4:0]};
|
expand[12:8] = 65'd31;
|
expand[12:8] = 65'd31;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Lx;
|
expand[5:0] = `Lx;
|
end
|
end
|
5'b01011: // LW Rt,d[SP]
|
5'b01011: // LW Rt,d[SP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[17:13] = cinstr[4:0];
|
expand[17:13] = cinstr[4:0];
|
expand[12:8] = 5'd31;
|
expand[12:8] = 5'd31;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Lx;
|
expand[5:0] = `Lx;
|
end
|
end
|
5'b01101: // LH Rt,d[fP]
|
5'b01101: // LH Rt,d[fP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[17:13] = cinstr[4:0];
|
expand[17:13] = cinstr[4:0];
|
expand[12:8] = 6'd30;
|
expand[12:8] = 6'd30;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Lx;
|
expand[5:0] = `Lx;
|
end
|
end
|
5'b01111: // LW Rt,d[FP]
|
5'b01111: // LW Rt,d[FP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[17:13] = cinstr[4:0];
|
expand[17:13] = cinstr[4:0];
|
expand[12:8] = 5'd30;
|
expand[12:8] = 5'd30;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Lx;
|
expand[5:0] = `Lx;
|
end
|
end
|
5'b10001: // SH Rt,d[SP]
|
5'b10001: // SH Rt,d[SP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[17:13] = cinstr[4:0];
|
expand[17:13] = cinstr[4:0];
|
expand[12:8] = 5'd31;
|
expand[12:8] = 5'd31;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Sx;
|
expand[5:0] = `Sx;
|
end
|
end
|
5'b10011: // SW Rt,d[SP]
|
5'b10011: // SW Rt,d[SP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[17:13] = cinstr[4:0];
|
expand[17:13] = cinstr[4:0];
|
expand[12:8] = 5'd31;
|
expand[12:8] = 5'd31;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Sx;
|
expand[5:0] = `Sx;
|
end
|
end
|
5'b10101: // SH Rt,d[fP]
|
5'b10101: // SH Rt,d[fP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
|
expand[17:13] = cinstr[4:0];
|
expand[17:13] = cinstr[4:0];
|
expand[12:8] = 6'd30;
|
expand[12:8] = 6'd30;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Sx;
|
expand[5:0] = `Sx;
|
end
|
end
|
5'b10111: // SW Rt,d[FP]
|
5'b10111: // SW Rt,d[FP]
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
|
expand[17:13] = cinstr[4:0];
|
expand[17:13] = cinstr[4:0];
|
expand[12:8] = 5'd30;
|
expand[12:8] = 5'd30;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Sx;
|
expand[5:0] = `Sx;
|
end
|
end
|
5'b11001:
|
5'b11001:
|
begin // LH
|
begin // LH
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Lx;
|
expand[5:0] = `Lx;
|
end
|
end
|
5'b11011: // LW
|
5'b11011: // LW
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Lx;
|
expand[5:0] = `Lx;
|
end
|
end
|
5'b11101: // SH
|
5'b11101: // SH
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};
|
expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Sx;
|
expand[5:0] = `Sx;
|
end
|
end
|
5'b11111: // SW
|
5'b11111: // SW
|
begin
|
begin
|
expand[47:32] = 16'h0000;
|
expand[47:32] = 16'h0000;
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};
|
expand[31:18] = {{6{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[12:8] = fnRp(cinstr[2:0]);
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `Sx;
|
expand[5:0] = `Sx;
|
end
|
end
|
default:
|
default:
|
begin
|
begin
|
expand[47:8] = 40'd0;
|
expand[47:8] = 40'd0;
|
expand[7:6] = 2'b10;
|
expand[7:6] = 2'b10;
|
expand[5:0] = `NOP;
|
expand[5:0] = `NOP;
|
end
|
end
|
endcase
|
endcase
|
|
|
endmodule
|
endmodule
|
|
|
