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// ============================================================================
//        __
//   \\__/ o\    (C) 2017-2019  Robert Finch, Waterloo
//    \  __ /    All rights reserved.
//     \/_//     robfinch<remove>@finitron.ca
//       ||
//
//      FT64_iexpander.v
//
// 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/>.    
//
// ============================================================================
//
`include ".\FT64_defines.vh"
 
module FT64_iexpander(cinstr,expand);
input [15:0] cinstr;
output reg [47:0] expand;
 
// Maps a subset of registers for compressed instructions.
function [4:0] fnRp;
input [2:0] rg;
case(rg)
3'd0:   fnRp = 5'd1;            // return value 0
3'd1:   fnRp = 5'd3;            // temp
3'd2:   fnRp = 5'd4;            // temp
3'd3:   fnRp = 5'd11;           // regvar
3'd4:   fnRp = 5'd12;           // regvar
3'd5:   fnRp = 5'd18;           // arg1
3'd6:   fnRp = 5'd19;           // arg2
3'd7:   fnRp = 5'd20;           // arg3
endcase
endfunction
 
always @*
casez({cinstr[15:12],cinstr[6]})
5'b00000:       // NOP / ADDI
        case(cinstr[4:0])
        5'd31:  begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'b0};
                        expand[17:13] = cinstr[4:0];
                        expand[12:8] = cinstr[4:0];
                        expand[7:6] = 2'b10;
                        expand[5:0] = `ADDI;
                        end
        default:
                        begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};
                        expand[17:13] = cinstr[4:0];
                        expand[12:8] = cinstr[4:0];
                        expand[7:6] = 2'b10;
                        expand[5:0] = `ADDI;
                        end
        endcase
5'b00010:       // SYS
                        if (cinstr[4:0]==5'd0) begin
                                expand[47:32] = 16'h0000;
                                expand[5:0] = `BRK;
                                expand[7:6] = 2'b10;
                                expand[15:8] = {3'd1,cinstr[11:8],cinstr[5]};
                                expand[16] = 1'b0;
                                expand[20:17] = 4'd0;
                                expand[23:21] = 3'd1;
                                expand[31:24] = 8'd0;
                        end
                        // LDI
                        else begin
                                expand[47:32] = 16'h0000;
                                expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};
                                expand[17:13] = cinstr[4:0];
                                expand[12:8] = 5'd0;
                                expand[7:6] = 2'b10;
                                expand[5:0] = `ADDI;     // ADDI to sign extend
                        end
5'b00100:       // RET / ANDI
                        if (cinstr[4:0]==5'd0) begin
                                expand[47:32] = 16'h0000;
                                expand[31:23] = {4'd0,cinstr[11:8],cinstr[5]};
                                expand[22:18] = 5'd29;
                                expand[17:13] = 5'd31;
                                expand[12:8] = 5'd31;
                                expand[7:6] = 2'b10;
                                expand[5:0] = `RET;
                        end
                        else begin
                                expand[47:32] = 16'h0000;
                                expand[5:0] = `ANDI;
                                expand[7:6] = 2'b10;
                                expand[12:8] = cinstr[4:0];
                                expand[17:13] = cinstr[4:0];
                                expand[31:18] = {{11{cinstr[11]}},cinstr[11:8],cinstr[5]};
                        end
5'b00110:       // SHLI
                        begin
                        expand[47:32] = 16'h0000;
                        expand[31:26] = 6'h0F;  // immediate mode 0-31
                        expand[25:23] = 3'd0;   // SHL
                        expand[22:18] = {cinstr[11:8],cinstr[5]};       // amount
                        expand[17:13] = cinstr[4:0];
                        expand[12:8] = cinstr[4:0];
                        expand[7:6] = 2'b10;
                        expand[5:0] = 8'h02;             // R2 instruction
                        end
5'b01000:
                        case(cinstr[5:4])
                        2'd0:           // SHRI
                                begin
                                expand[47:32] = 16'h0000;
                                expand[31:26] = 6'h0F;          // shift immediate 0-31
                                expand[25:23] = 3'd1;           // SHR
                                expand[22:18] = {cinstr[11:8],cinstr[3]};       // amount
                                expand[17:13] = fnRp(cinstr[2:0]);
                                expand[12:8] = fnRp(cinstr[2:0]);
                                expand[7:6] = 2'b10;
                                expand[5:0] = 8'h02;             // R2 instruction
                                end
                        2'd1:           // ASRI
                                begin
                                expand[47:32] = 16'h0000;
                                expand[31:26] = 6'h0F;          // shift immediate 0-31
                                expand[25:23] = 3'd3;           // ASR
                                expand[22:18] = {cinstr[11:8],cinstr[3]};       // amount
                                expand[17:13] = fnRp(cinstr[2:0]);
                                expand[12:8] = fnRp(cinstr[2:0]);
                                expand[7:6] = 2'b10;
                                expand[5:0] = 8'h02;             // R2 instruction
                                end
                        2'd2:           // ORI
                                begin
                                expand[47:32] = 16'h0000;
                                expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[3]};
                                expand[17:13] = fnRp(cinstr[2:0]);
                                expand[12:8] = fnRp(cinstr[2:0]);
                                expand[7:6] = 2'b10;
                                expand[5:0] = `ORI;
                                end
                        2'd3:
                                case(cinstr[11:10])
                                2'd0:   begin
                                                expand[47:32] = 16'h0000;
                                                expand[31:26] = `SUB;
                                                expand[25:23] = 3'b011; // word size
                                                expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
                                                expand[17:13] = fnRp(cinstr[2:0]);
                                                expand[12:8] = fnRp(cinstr[2:0]);
                                                expand[7:6] = 2'b10;
                                                expand[5:0] = 6'h02;             // R2 instruction
                                                end
                                2'd1:   begin
                                                expand[47:32] = 16'h0000;
                                                expand[31:26] = `AND;
                                                expand[25:23] = 3'b011; // word size
                                                expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
                                                expand[17:13] = fnRp(cinstr[2:0]);
                                                expand[12:8] = fnRp(cinstr[2:0]);
                                                expand[7:6] = 2'b10;
                                                expand[5:0] = 6'h02;             // R2 instruction
                                                end
                                2'd2:   begin
                                                expand[47:32] = 16'h0000;
                                                expand[31:26] = `OR;
                                                expand[25:23] = 3'b011; // word size
                                                expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
                                                expand[17:13] = fnRp(cinstr[2:0]);
                                                expand[12:8] = fnRp(cinstr[2:0]);
                                                expand[7:6] = 2'b10;
                                                expand[5:0] = 6'h02;             // R2 instruction
                                                end
                                2'd3:   begin
                                                expand[47:32] = 16'h0000;
                                                expand[31:26] = `XOR;
                                                expand[25:23] = 3'b011; // word size
                                                expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});
                                                expand[17:13] = fnRp(cinstr[2:0]);
                                                expand[12:8] = fnRp(cinstr[2:0]);
                                                expand[7:6] = 2'b10;
                                                expand[5:0] = 6'h02;             // R2 instruction
                                                end
                                endcase
                        endcase
5'b01110:
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{1{cinstr[11]}},{cinstr[11:8],cinstr[5:2]}};
                        expand[22:18] = 5'd0;           // Rb = 0
                        expand[17:16] = cinstr[1:0];
                        expand[15:13] = 3'd0;           // BEQ
                        expand[12:8] = 5'd0;            // Ra = r0
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Bcc;              // 0x38
                end
5'b10??0:
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{4{cinstr[13]}},cinstr[13:9]};
                        expand[22:18] = 5'd0;                   // r0
                        expand[17:16] = {cinstr[8],cinstr[5]};
                        expand[15:13] = 3'd0;                   // BEQ
                        expand[12:8] = cinstr[4:0];      // Ra
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Bcc;
                end
5'b11??0:
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{4{cinstr[13]}},cinstr[13:9]};
                        expand[22:18] = 5'd0;                   // r0
                        expand[17:16] = {cinstr[8],cinstr[5]};
                        expand[15:13] = 3'd1;                   // BNE
                        expand[12:8] = cinstr[4:0];      // Ra
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Bcc;
                end
5'b00001:
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:26] = `MOV;                   // `MOV is 6'b01001?
                        expand[26] = 1'b0;
                        expand[25:23] = 3'd7;                   // move current to current
                        expand[22:18] = 5'd0;                   // register set (ignored)
                        expand[17:13] = {cinstr[11:8],cinstr[5]};
                        expand[12:8] = cinstr[4:0];
                        expand[7:6] = 2'b10;
                        expand[5:0] = 6'h02;
                end
5'b00011:       // ADD
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:26] = `ADD;
                        expand[27:23] = 3'b011; // word size
                        expand[22:18] = {cinstr[11:8],cinstr[5]};
                        expand[17:13] = cinstr[4:0];
                        expand[12:8] = cinstr[4:0];
                        expand[7:6] = 2'b10;
                        expand[5:0] = 6'h02;             // R2 instruction
                end
5'b00101:       // JALR
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = 14'd0;
                        expand[17:13] = {cinstr[11:8],cinstr[5]};
                        expand[12:8] = cinstr[4:0];
                        expand[7:6] = 2'b10;
                        expand[5:0] = `JAL;
                end
5'b00111:
                if ({cinstr[11:8]==4'h1}) begin
                        expand[47:32] = 16'h0000;
                        expand[31:26] = 6'h36;          // SEG instructions
                        expand[22:18] = {2'b0,cinstr[2:0]};
                        expand[17:13] = 5'd0;                   // no target
                        expand[12:8] = 5'd0;
                        expand[7:6] = 2'b10;
                        expand[5:0] = 6'h02;
                end
                else if ({cinstr[11:8],cinstr[5]}==5'b0) begin  // PUSH
                        expand[47:32] = 16'h0000;
                        expand[31:28] = 4'hC;
                        expand[27:23] = 5'd0;
                        expand[22:18] = cinstr[4:0];
                        expand[17:13] = 5'd31;
                        expand[12:8] = 5'd31;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `MEMNDX;
                end
                else begin
                        expand[47:8] = 40'd0;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `NOP;
                end
5'b01001:       // LH Rt,d[SP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
                        expand[17:13] = {cinstr[4:0]};
                        expand[12:8] = 5'd31;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Lx;
                end
5'b01011:       // LW Rt,d[SP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
                        expand[17:13] = cinstr[4:0];
                        expand[12:8] = 5'd31;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Lx;
                end
5'b01101:       // LH Rt,d[fP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};
                        expand[17:13] = cinstr[4:0];
                        expand[12:8] = 5'd30;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Lx;
                end
5'b01111:       // LW Rt,d[FP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};
                        expand[17:13] = cinstr[4:0];
                        expand[12:8] = 5'd30;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Lx;
                end
5'b10001:       // SH Rt,d[SP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{7{cinstr[11]}},cinstr[11:10]};
                        expand[22:18] = cinstr[4:0];
                        expand[17:13] = {cinstr[9:8],cinstr[5],2'd2};
                        expand[12:8] = 5'd31;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Sx;
                end
5'b10011:       // SW Rt,d[SP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{6{cinstr[11]}},cinstr[11:9]};
                        expand[22:18] = cinstr[4:0];
                        expand[17:13] = {cinstr[8],cinstr[5],3'd4};
                        expand[12:8] = 5'd31;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Sx;
                end
5'b10101:       // SH Rt,d[fP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{7{cinstr[11]}},cinstr[11:10]};
                        expand[22:18] = cinstr[4:0];
                        expand[17:13] = {cinstr[9:8],cinstr[5],2'd2};
                        expand[12:8] = 5'd30;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Sx;
                end
5'b10111:       // SW Rt,d[FP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{6{cinstr[11]}},cinstr[11:9]};
                        expand[22:18] = cinstr[4:0];
                        expand[17:13] = {cinstr[8],cinstr[5],3'd4};
                        expand[12:8] = 5'd30;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Sx;
                end
5'b11001:
                begin   // LH
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{8{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};
                        expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
                        expand[12:8] = fnRp(cinstr[2:0]);
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Lx;
                end
5'b11011:       // LW
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};
                        expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});
                        expand[12:8] = fnRp(cinstr[2:0]);
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Lx;
                end
5'b11101:       // SH
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{8{cinstr[11]}},cinstr[11]};
                        expand[22:18] = fnRp({cinstr[9:8],cinstr[5]});
                        expand[17:13] = {cinstr[10],cinstr[4:3],2'd2};
                        expand[12:8] = fnRp(cinstr[2:0]);
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Sx;
                end
5'b11111:       // SW
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:23] = {{7{cinstr[11]}},cinstr[11:10]};
                        expand[22:18] = fnRp({cinstr[9:8],cinstr[5]});
                        expand[17:13] = {cinstr[4:3],3'd4};
                        expand[12:8] = fnRp(cinstr[2:0]);
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Sx;
                end
default:
                begin
                        expand[47:8] = 40'd0;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `NOP;
                end
endcase
 
endmodule

Line No.	Rev	Author	Line
1	60	robfinch	`// ============================================================================`
2			`// __`
3	61	robfinch	`// \\__/ o\ (C) 2017-2019 Robert Finch, Waterloo`
4	60	robfinch	`// \ __ / All rights reserved.`
5			`// \/_// robfinch<remove>@finitron.ca`
6			`// \|\|`
7			`//`
8			`// FT64_iexpander.v`
9			`//`
10			`// This source file is free software: you can redistribute it and/or modify`
11			`// it under the terms of the GNU Lesser General Public License as published`
12			`// by the Free Software Foundation, either version 3 of the License, or`
13			`// (at your option) any later version.`
14			`//`
15			`// This source file is distributed in the hope that it will be useful,`
16			`// but WITHOUT ANY WARRANTY; without even the implied warranty of`
17			`// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
18			`// GNU General Public License for more details.`
19			`//`
20			`// You should have received a copy of the GNU General Public License`
21			`// along with this program. If not, see <http://www.gnu.org/licenses/>.`
22			`//`
23			`// ============================================================================`
24			`//`
25			`include ".\FT64_defines.vh"
26
27			`module FT64_iexpander(cinstr,expand);`
28			`input [15:0] cinstr;`
29			`output reg [47:0] expand;`
30
31			`// Maps a subset of registers for compressed instructions.`
32			`function [4:0] fnRp;`
33			`input [2:0] rg;`
34			`case(rg)`
35			`3'd0: fnRp = 5'd1; // return value 0`
36			`3'd1: fnRp = 5'd3; // temp`
37			`3'd2: fnRp = 5'd4; // temp`
38			`3'd3: fnRp = 5'd11; // regvar`
39			`3'd4: fnRp = 5'd12; // regvar`
40			`3'd5: fnRp = 5'd18; // arg1`
41			`3'd6: fnRp = 5'd19; // arg2`
42			`3'd7: fnRp = 5'd20; // arg3`
43			`endcase`
44			`endfunction`
45
46			`always @*`
47			`casez({cinstr[15:12],cinstr[6]})`
48			`5'b00000: // NOP / ADDI`
49			`case(cinstr[4:0])`
50			`5'd31: begin`
51			`expand[47:32] = 16'h0000;`
52			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'b0};`
53			`expand[17:13] = cinstr[4:0];`
54			`expand[12:8] = cinstr[4:0];`
55			`expand[7:6] = 2'b10;`
56			expand[5:0] = `ADDI;
57			`end`
58			`default:`
59			`begin`
60			`expand[47:32] = 16'h0000;`
61			`expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};`
62			`expand[17:13] = cinstr[4:0];`
63			`expand[12:8] = cinstr[4:0];`
64			`expand[7:6] = 2'b10;`
65			expand[5:0] = `ADDI;
66			`end`
67			`endcase`
68			`5'b00010: // SYS`
69			`if (cinstr[4:0]==5'd0) begin`
70			`expand[47:32] = 16'h0000;`
71			expand[5:0] = `BRK;
72			`expand[7:6] = 2'b10;`
73			`expand[15:8] = {3'd1,cinstr[11:8],cinstr[5]};`
74			`expand[16] = 1'b0;`
75			`expand[20:17] = 4'd0;`
76			`expand[23:21] = 3'd1;`
77			`expand[31:24] = 8'd0;`
78			`end`
79			`// LDI`
80			`else begin`
81			`expand[47:32] = 16'h0000;`
82			`expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};`
83			`expand[17:13] = cinstr[4:0];`
84			`expand[12:8] = 5'd0;`
85			`expand[7:6] = 2'b10;`
86			expand[5:0] = `ADDI; // ADDI to sign extend
87			`end`
88			`5'b00100: // RET / ANDI`
89			`if (cinstr[4:0]==5'd0) begin`
90			`expand[47:32] = 16'h0000;`
91			`expand[31:23] = {4'd0,cinstr[11:8],cinstr[5]};`
92			`expand[22:18] = 5'd29;`
93			`expand[17:13] = 5'd31;`
94			`expand[12:8] = 5'd31;`
95			`expand[7:6] = 2'b10;`
96			expand[5:0] = `RET;
97			`end`
98			`else begin`
99			`expand[47:32] = 16'h0000;`
100			expand[5:0] = `ANDI;
101			`expand[7:6] = 2'b10;`
102			`expand[12:8] = cinstr[4:0];`
103			`expand[17:13] = cinstr[4:0];`
104			`expand[31:18] = {{11{cinstr[11]}},cinstr[11:8],cinstr[5]};`
105			`end`
106			`5'b00110: // SHLI`
107			`begin`
108			`expand[47:32] = 16'h0000;`
109			`expand[31:26] = 6'h0F; // immediate mode 0-31`
110			`expand[25:23] = 3'd0; // SHL`
111			`expand[22:18] = {cinstr[11:8],cinstr[5]}; // amount`
112			`expand[17:13] = cinstr[4:0];`
113			`expand[12:8] = cinstr[4:0];`
114			`expand[7:6] = 2'b10;`
115			`expand[5:0] = 8'h02; // R2 instruction`
116			`end`
117			`5'b01000:`
118			`case(cinstr[5:4])`
119			`2'd0: // SHRI`
120			`begin`
121			`expand[47:32] = 16'h0000;`
122			`expand[31:26] = 6'h0F; // shift immediate 0-31`
123			`expand[25:23] = 3'd1; // SHR`
124			`expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount`
125			`expand[17:13] = fnRp(cinstr[2:0]);`
126			`expand[12:8] = fnRp(cinstr[2:0]);`
127			`expand[7:6] = 2'b10;`
128			`expand[5:0] = 8'h02; // R2 instruction`
129			`end`
130			`2'd1: // ASRI`
131			`begin`
132			`expand[47:32] = 16'h0000;`
133			`expand[31:26] = 6'h0F; // shift immediate 0-31`
134			`expand[25:23] = 3'd3; // ASR`
135			`expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount`
136			`expand[17:13] = fnRp(cinstr[2:0]);`
137			`expand[12:8] = fnRp(cinstr[2:0]);`
138			`expand[7:6] = 2'b10;`
139			`expand[5:0] = 8'h02; // R2 instruction`
140			`end`
141			`2'd2: // ORI`
142			`begin`
143			`expand[47:32] = 16'h0000;`
144			`expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[3]};`
145			`expand[17:13] = fnRp(cinstr[2:0]);`
146			`expand[12:8] = fnRp(cinstr[2:0]);`
147			`expand[7:6] = 2'b10;`
148			expand[5:0] = `ORI;
149			`end`
150			`2'd3:`
151			`case(cinstr[11:10])`
152			`2'd0: begin`
153			`expand[47:32] = 16'h0000;`
154			expand[31:26] = `SUB;
155			`expand[25:23] = 3'b011; // word size`
156			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
157			`expand[17:13] = fnRp(cinstr[2:0]);`
158			`expand[12:8] = fnRp(cinstr[2:0]);`
159			`expand[7:6] = 2'b10;`
160	61	robfinch	`expand[5:0] = 6'h02; // R2 instruction`
161	60	robfinch	`end`
162			`2'd1: begin`
163			`expand[47:32] = 16'h0000;`
164			expand[31:26] = `AND;
165			`expand[25:23] = 3'b011; // word size`
166			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
167			`expand[17:13] = fnRp(cinstr[2:0]);`
168			`expand[12:8] = fnRp(cinstr[2:0]);`
169			`expand[7:6] = 2'b10;`
170	61	robfinch	`expand[5:0] = 6'h02; // R2 instruction`
171	60	robfinch	`end`
172			`2'd2: begin`
173			`expand[47:32] = 16'h0000;`
174			expand[31:26] = `OR;
175			`expand[25:23] = 3'b011; // word size`
176			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
177			`expand[17:13] = fnRp(cinstr[2:0]);`
178			`expand[12:8] = fnRp(cinstr[2:0]);`
179			`expand[7:6] = 2'b10;`
180	61	robfinch	`expand[5:0] = 6'h02; // R2 instruction`
181	60	robfinch	`end`
182			`2'd3: begin`
183			`expand[47:32] = 16'h0000;`
184			expand[31:26] = `XOR;
185			`expand[25:23] = 3'b011; // word size`
186			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
187			`expand[17:13] = fnRp(cinstr[2:0]);`
188			`expand[12:8] = fnRp(cinstr[2:0]);`
189			`expand[7:6] = 2'b10;`
190	61	robfinch	`expand[5:0] = 6'h02; // R2 instruction`
191	60	robfinch	`end`
192			`endcase`
193			`endcase`
194			`5'b01110:`
195			`begin`
196			`expand[47:32] = 16'h0000;`
197			`expand[31:23] = {{1{cinstr[11]}},{cinstr[11:8],cinstr[5:2]}};`
198			`expand[22:18] = 5'd0; // Rb = 0`
199			`expand[17:16] = cinstr[1:0];`
200			`expand[15:13] = 3'd0; // BEQ`
201	61	robfinch	`expand[12:8] = 5'd0; // Ra = r0`
202	60	robfinch	`expand[7:6] = 2'b10;`
203			expand[5:0] = `Bcc; // 0x38
204			`end`
205			`5'b10??0:`
206			`begin`
207			`expand[47:32] = 16'h0000;`
208			`expand[31:23] = {{4{cinstr[13]}},cinstr[13:9]};`
209			`expand[22:18] = 5'd0; // r0`
210			`expand[17:16] = {cinstr[8],cinstr[5]};`
211			`expand[15:13] = 3'd0; // BEQ`
212			`expand[12:8] = cinstr[4:0]; // Ra`
213			`expand[7:6] = 2'b10;`
214			expand[5:0] = `Bcc;
215			`end`
216			`5'b11??0:`
217			`begin`
218			`expand[47:32] = 16'h0000;`
219			`expand[31:23] = {{4{cinstr[13]}},cinstr[13:9]};`
220			`expand[22:18] = 5'd0; // r0`
221			`expand[17:16] = {cinstr[8],cinstr[5]};`
222			`expand[15:13] = 3'd1; // BNE`
223			`expand[12:8] = cinstr[4:0]; // Ra`
224			`expand[7:6] = 2'b10;`
225			expand[5:0] = `Bcc;
226			`end`
227			`5'b00001:`
228			`begin`
229			`expand[47:32] = 16'h0000;`
230			expand[31:26] = `MOV; // `MOV is 6'b01001?
231			`expand[26] = 1'b0;`
232			`expand[25:23] = 3'd7; // move current to current`
233			`expand[22:18] = 5'd0; // register set (ignored)`
234			`expand[17:13] = {cinstr[11:8],cinstr[5]};`
235			`expand[12:8] = cinstr[4:0];`
236			`expand[7:6] = 2'b10;`
237			`expand[5:0] = 6'h02;`
238			`end`
239			`5'b00011: // ADD`
240			`begin`
241			`expand[47:32] = 16'h0000;`
242			expand[31:26] = `ADD;
243			`expand[27:23] = 3'b011; // word size`
244			`expand[22:18] = {cinstr[11:8],cinstr[5]};`
245			`expand[17:13] = cinstr[4:0];`
246			`expand[12:8] = cinstr[4:0];`
247			`expand[7:6] = 2'b10;`
248			`expand[5:0] = 6'h02; // R2 instruction`
249			`end`
250			`5'b00101: // JALR`
251			`begin`
252			`expand[47:32] = 16'h0000;`
253			`expand[31:18] = 14'd0;`
254			`expand[17:13] = {cinstr[11:8],cinstr[5]};`
255			`expand[12:8] = cinstr[4:0];`
256			`expand[7:6] = 2'b10;`
257			expand[5:0] = `JAL;
258			`end`
259			`5'b00111:`
260			`if ({cinstr[11:8]==4'h1}) begin`
261			`expand[47:32] = 16'h0000;`
262			`expand[31:26] = 6'h36; // SEG instructions`
263			`expand[22:18] = {2'b0,cinstr[2:0]};`
264			`expand[17:13] = 5'd0; // no target`
265			`expand[12:8] = 5'd0;`
266			`expand[7:6] = 2'b10;`
267			`expand[5:0] = 6'h02;`
268			`end`
269			`else if ({cinstr[11:8],cinstr[5]}==5'b0) begin // PUSH`
270			`expand[47:32] = 16'h0000;`
271			`expand[31:28] = 4'hC;`
272			`expand[27:23] = 5'd0;`
273			`expand[22:18] = cinstr[4:0];`
274			`expand[17:13] = 5'd31;`
275			`expand[12:8] = 5'd31;`
276			`expand[7:6] = 2'b10;`
277			expand[5:0] = `MEMNDX;
278			`end`
279			`else begin`
280			`expand[47:8] = 40'd0;`
281			`expand[7:6] = 2'b10;`
282			expand[5:0] = `NOP;
283			`end`
284			`5'b01001: // LH Rt,d[SP]`
285			`begin`
286			`expand[47:32] = 16'h0000;`
287			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};`
288			`expand[17:13] = {cinstr[4:0]};`
289			`expand[12:8] = 5'd31;`
290			`expand[7:6] = 2'b10;`
291			expand[5:0] = `Lx;
292			`end`
293			`5'b01011: // LW Rt,d[SP]`
294			`begin`
295			`expand[47:32] = 16'h0000;`
296			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};`
297			`expand[17:13] = cinstr[4:0];`
298			`expand[12:8] = 5'd31;`
299			`expand[7:6] = 2'b10;`
300			expand[5:0] = `Lx;
301			`end`
302			`5'b01101: // LH Rt,d[fP]`
303			`begin`
304			`expand[47:32] = 16'h0000;`
305			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};`
306			`expand[17:13] = cinstr[4:0];`
307			`expand[12:8] = 5'd30;`
308			`expand[7:6] = 2'b10;`
309			expand[5:0] = `Lx;
310			`end`
311			`5'b01111: // LW Rt,d[FP]`
312			`begin`
313			`expand[47:32] = 16'h0000;`
314			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};`
315			`expand[17:13] = cinstr[4:0];`
316			`expand[12:8] = 5'd30;`
317			`expand[7:6] = 2'b10;`
318			expand[5:0] = `Lx;
319			`end`
320			`5'b10001: // SH Rt,d[SP]`
321			`begin`
322			`expand[47:32] = 16'h0000;`
323			`expand[31:23] = {{7{cinstr[11]}},cinstr[11:10]};`
324			`expand[22:18] = cinstr[4:0];`
325			`expand[17:13] = {cinstr[9:8],cinstr[5],2'd2};`
326			`expand[12:8] = 5'd31;`
327			`expand[7:6] = 2'b10;`
328			expand[5:0] = `Sx;
329			`end`
330			`5'b10011: // SW Rt,d[SP]`
331			`begin`
332			`expand[47:32] = 16'h0000;`
333			`expand[31:23] = {{6{cinstr[11]}},cinstr[11:9]};`
334			`expand[22:18] = cinstr[4:0];`
335			`expand[17:13] = {cinstr[8],cinstr[5],3'd4};`
336			`expand[12:8] = 5'd31;`
337			`expand[7:6] = 2'b10;`
338			expand[5:0] = `Sx;
339			`end`
340			`5'b10101: // SH Rt,d[fP]`
341			`begin`
342			`expand[47:32] = 16'h0000;`
343			`expand[31:23] = {{7{cinstr[11]}},cinstr[11:10]};`
344			`expand[22:18] = cinstr[4:0];`
345			`expand[17:13] = {cinstr[9:8],cinstr[5],2'd2};`
346			`expand[12:8] = 5'd30;`
347			`expand[7:6] = 2'b10;`
348			expand[5:0] = `Sx;
349			`end`
350			`5'b10111: // SW Rt,d[FP]`
351			`begin`
352			`expand[47:32] = 16'h0000;`
353			`expand[31:23] = {{6{cinstr[11]}},cinstr[11:9]};`
354			`expand[22:18] = cinstr[4:0];`
355			`expand[17:13] = {cinstr[8],cinstr[5],3'd4};`
356			`expand[12:8] = 5'd30;`
357			`expand[7:6] = 2'b10;`
358			expand[5:0] = `Sx;
359			`end`
360			`5'b11001:`
361			`begin // LH`
362			`expand[47:32] = 16'h0000;`
363			`expand[31:18] = {{8{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};`
364			`expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});`
365			`expand[12:8] = fnRp(cinstr[2:0]);`
366			`expand[7:6] = 2'b10;`
367			expand[5:0] = `Lx;
368			`end`
369			`5'b11011: // LW`
370			`begin`
371			`expand[47:32] = 16'h0000;`
372			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};`
373			`expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});`
374			`expand[12:8] = fnRp(cinstr[2:0]);`
375			`expand[7:6] = 2'b10;`
376			expand[5:0] = `Lx;
377			`end`
378			`5'b11101: // SH`
379			`begin`
380			`expand[47:32] = 16'h0000;`
381			`expand[31:23] = {{8{cinstr[11]}},cinstr[11]};`
382			`expand[22:18] = fnRp({cinstr[9:8],cinstr[5]});`
383			`expand[17:13] = {cinstr[10],cinstr[4:3],2'd2};`
384			`expand[12:8] = fnRp(cinstr[2:0]);`
385			`expand[7:6] = 2'b10;`
386			expand[5:0] = `Sx;
387			`end`
388			`5'b11111: // SW`
389			`begin`
390			`expand[47:32] = 16'h0000;`
391			`expand[31:23] = {{7{cinstr[11]}},cinstr[11:10]};`
392			`expand[22:18] = fnRp({cinstr[9:8],cinstr[5]});`
393			`expand[17:13] = {cinstr[4:3],3'd4};`
394			`expand[12:8] = fnRp(cinstr[2:0]);`
395			`expand[7:6] = 2'b10;`
396			expand[5:0] = `Sx;
397			`end`
398			`default:`
399			`begin`
400			`expand[47:8] = 40'd0;`
401			`expand[7:6] = 2'b10;`
402			expand[5:0] = `NOP;
403			`end`
404			`endcase`
405
406			`endmodule`

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