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turbo9_urtl_decode_pg2_R1.v
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turbo9_urtl_decode_pg2_R1.v
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// [TURBO9_DECODE_HEADER_START]
//////////////////////////////////////////////////////////////////////////////
// Turbo9 Microprocessor IP
//////////////////////////////////////////////////////////////////////////////
// Website: www.turbo9.org
// Contact: team[at]turbo9[dot]org
//////////////////////////////////////////////////////////////////////////////
// [TURBO9_DECODE_LICENSE_START]
// BSD-1-Clause
//
// Copyright (c) 2020-2023
// Kevin Phillipson
// Michael Rywalt
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
// [TURBO9_DECODE_LICENSE_END]
//////////////////////////////////////////////////////////////////////////////
// Engineer: Kevin Phillipson & Michael Rywalt
// Description:
// Assembled from turbo9_urtl.asm file
// built using cv_R1_SEL ctrl_vec
//
//////////////////////////////////////////////////////////////////////////////
// History:
// 07.14.2023 - Kevin Phillipson
// File header added
//
//////////////////////////////////////////////////////////////////////////////
// [TURBO9_DECODE_HEADER_END]
/////////////////////////////////////////////////////////////////////////////
// MODULE
/////////////////////////////////////////////////////////////////////////////
module turbo9_urtl_decode_pg2_R1(
input [7:0] OPCODE_I,
output reg [3:0] PG2_R1_O
);
/////////////////////////////////////////////////////////////////////////////
// LOGIC
/////////////////////////////////////////////////////////////////////////////
always @* begin
case (OPCODE_I)
8'h18 : PG2_R1_O = 4'h1; // X IDIVS (inh)
8'h19 : PG2_R1_O = 4'h1; // X FDIV (inh)
8'h20 : PG2_R1_O = 4'h5; // PC LBRA LBRN LBHI LBLS
8'h21 : PG2_R1_O = 4'h5; // PC LBRA LBRN LBHI LBLS
8'h22 : PG2_R1_O = 4'h5; // PC LBRA LBRN LBHI LBLS
8'h23 : PG2_R1_O = 4'h5; // PC LBRA LBRN LBHI LBLS
8'h24 : PG2_R1_O = 4'h5; // PC LBCC LBCS LBNE LBEQ
8'h25 : PG2_R1_O = 4'h5; // PC LBCC LBCS LBNE LBEQ
8'h26 : PG2_R1_O = 4'h5; // PC LBCC LBCS LBNE LBEQ
8'h27 : PG2_R1_O = 4'h5; // PC LBCC LBCS LBNE LBEQ
8'h28 : PG2_R1_O = 4'h5; // PC LBVC LBVS LBPL LBMI
8'h29 : PG2_R1_O = 4'h5; // PC LBVC LBVS LBPL LBMI
8'h2A : PG2_R1_O = 4'h5; // PC LBVC LBVS LBPL LBMI
8'h2B : PG2_R1_O = 4'h5; // PC LBVC LBVS LBPL LBMI
8'h2C : PG2_R1_O = 4'h5; // PC LBGE LBLT LBGT LBLE
8'h2D : PG2_R1_O = 4'h5; // PC LBGE LBLT LBGT LBLE
8'h2E : PG2_R1_O = 4'h5; // PC LBGE LBLT LBGT LBLE
8'h2F : PG2_R1_O = 4'h5; // PC LBGE LBLT LBGT LBLE
8'h83 : PG2_R1_O = 4'h0; // D CMPD (imm)
8'h8C : PG2_R1_O = 4'h2; // Y CMPY (imm)
8'h8E : PG2_R1_O = 4'h2; // Y LDY (imm)
8'h93 : PG2_R1_O = 4'h0; // D CMPD (dir idx ext)
8'h9C : PG2_R1_O = 4'h2; // Y CMPY (dir idx ext)
8'h9E : PG2_R1_O = 4'h2; // Y LDY (dir idx ext)
8'h9F : PG2_R1_O = 4'h2; // Y STY (dir ext)
8'hA3 : PG2_R1_O = 4'h0; // D CMPD (dir idx ext)
8'hAC : PG2_R1_O = 4'h2; // Y CMPY (dir idx ext)
8'hAE : PG2_R1_O = 4'h2; // Y LDY (dir idx ext)
8'hAF : PG2_R1_O = 4'h2; // Y STY (idx)
8'hB3 : PG2_R1_O = 4'h0; // D CMPD (dir idx ext)
8'hBC : PG2_R1_O = 4'h2; // Y CMPY (dir idx ext)
8'hBE : PG2_R1_O = 4'h2; // Y LDY (dir idx ext)
8'hBF : PG2_R1_O = 4'h2; // Y STY (dir ext)
8'hCE : PG2_R1_O = 4'h4; // S LDS (imm)
8'hDE : PG2_R1_O = 4'h4; // S LDS (dir idx ext)
8'hDF : PG2_R1_O = 4'h4; // S STS (dir ext)
8'hEE : PG2_R1_O = 4'h4; // S LDS (dir idx ext)
8'hEF : PG2_R1_O = 4'h4; // S STS (idx)
8'hFE : PG2_R1_O = 4'h4; // S LDS (dir idx ext)
8'hFF : PG2_R1_O = 4'h4; // S STS (dir ext)
default : PG2_R1_O = 4'hx; // from decode_init
endcase
end
`ifdef SIM_TURBO9
reg [(8*64):0] PG2_R1_op;
always @* begin
case (OPCODE_I)
8'h18 : PG2_R1_op = "IDIVS (inh)";
8'h19 : PG2_R1_op = "FDIV (inh)";
8'h20 : PG2_R1_op = "LBRA LBRN LBHI LBLS";
8'h21 : PG2_R1_op = "LBRA LBRN LBHI LBLS";
8'h22 : PG2_R1_op = "LBRA LBRN LBHI LBLS";
8'h23 : PG2_R1_op = "LBRA LBRN LBHI LBLS";
8'h24 : PG2_R1_op = "LBCC LBCS LBNE LBEQ";
8'h25 : PG2_R1_op = "LBCC LBCS LBNE LBEQ";
8'h26 : PG2_R1_op = "LBCC LBCS LBNE LBEQ";
8'h27 : PG2_R1_op = "LBCC LBCS LBNE LBEQ";
8'h28 : PG2_R1_op = "LBVC LBVS LBPL LBMI";
8'h29 : PG2_R1_op = "LBVC LBVS LBPL LBMI";
8'h2A : PG2_R1_op = "LBVC LBVS LBPL LBMI";
8'h2B : PG2_R1_op = "LBVC LBVS LBPL LBMI";
8'h2C : PG2_R1_op = "LBGE LBLT LBGT LBLE";
8'h2D : PG2_R1_op = "LBGE LBLT LBGT LBLE";
8'h2E : PG2_R1_op = "LBGE LBLT LBGT LBLE";
8'h2F : PG2_R1_op = "LBGE LBLT LBGT LBLE";
8'h83 : PG2_R1_op = "CMPD (imm)";
8'h8C : PG2_R1_op = "CMPY (imm)";
8'h8E : PG2_R1_op = "LDY (imm)";
8'h93 : PG2_R1_op = "CMPD (dir idx ext)";
8'h9C : PG2_R1_op = "CMPY (dir idx ext)";
8'h9E : PG2_R1_op = "LDY (dir idx ext)";
8'h9F : PG2_R1_op = "STY (dir ext)";
8'hA3 : PG2_R1_op = "CMPD (dir idx ext)";
8'hAC : PG2_R1_op = "CMPY (dir idx ext)";
8'hAE : PG2_R1_op = "LDY (dir idx ext)";
8'hAF : PG2_R1_op = "STY (idx)";
8'hB3 : PG2_R1_op = "CMPD (dir idx ext)";
8'hBC : PG2_R1_op = "CMPY (dir idx ext)";
8'hBE : PG2_R1_op = "LDY (dir idx ext)";
8'hBF : PG2_R1_op = "STY (dir ext)";
8'hCE : PG2_R1_op = "LDS (imm)";
8'hDE : PG2_R1_op = "LDS (dir idx ext)";
8'hDF : PG2_R1_op = "STS (dir ext)";
8'hEE : PG2_R1_op = "LDS (dir idx ext)";
8'hEF : PG2_R1_op = "STS (idx)";
8'hFE : PG2_R1_op = "LDS (dir idx ext)";
8'hFF : PG2_R1_op = "STS (dir ext)";
default : PG2_R1_op = "invalid";
endcase
end
reg [(8*64):0] PG2_R1_eq;
always @* begin
case (OPCODE_I)
8'h18 : PG2_R1_eq = "X";
8'h19 : PG2_R1_eq = "X";
8'h20 : PG2_R1_eq = "PC";
8'h21 : PG2_R1_eq = "PC";
8'h22 : PG2_R1_eq = "PC";
8'h23 : PG2_R1_eq = "PC";
8'h24 : PG2_R1_eq = "PC";
8'h25 : PG2_R1_eq = "PC";
8'h26 : PG2_R1_eq = "PC";
8'h27 : PG2_R1_eq = "PC";
8'h28 : PG2_R1_eq = "PC";
8'h29 : PG2_R1_eq = "PC";
8'h2A : PG2_R1_eq = "PC";
8'h2B : PG2_R1_eq = "PC";
8'h2C : PG2_R1_eq = "PC";
8'h2D : PG2_R1_eq = "PC";
8'h2E : PG2_R1_eq = "PC";
8'h2F : PG2_R1_eq = "PC";
8'h83 : PG2_R1_eq = "D";
8'h8C : PG2_R1_eq = "Y";
8'h8E : PG2_R1_eq = "Y";
8'h93 : PG2_R1_eq = "D";
8'h9C : PG2_R1_eq = "Y";
8'h9E : PG2_R1_eq = "Y";
8'h9F : PG2_R1_eq = "Y";
8'hA3 : PG2_R1_eq = "D";
8'hAC : PG2_R1_eq = "Y";
8'hAE : PG2_R1_eq = "Y";
8'hAF : PG2_R1_eq = "Y";
8'hB3 : PG2_R1_eq = "D";
8'hBC : PG2_R1_eq = "Y";
8'hBE : PG2_R1_eq = "Y";
8'hBF : PG2_R1_eq = "Y";
8'hCE : PG2_R1_eq = "S";
8'hDE : PG2_R1_eq = "S";
8'hDF : PG2_R1_eq = "S";
8'hEE : PG2_R1_eq = "S";
8'hEF : PG2_R1_eq = "S";
8'hFE : PG2_R1_eq = "S";
8'hFF : PG2_R1_eq = "S";
default : PG2_R1_eq = "invalid";
endcase
end
`endif
/////////////////////////////////////////////////////////////////////////////
endmodule