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// ============================================================================
//        __
//   \\__/ o\    (C) 2017-2018  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] = `ORI;
                        end
5'b00100:       // RET / ANDI
                        if (cinstr[4:0]==5'd0) begin
                                expand[47:32] = 16'h0000;
                                expand[5:0] = `RET;
                                expand[7:6] = 2'b10;
                                expand[12:8] = 5'd31;
                                expand[17:13] = 5'd29;
                                expand[31:18] = {8'd0,cinstr[11:8],cinstr[5],3'd0};
                        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] = 8'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] = 8'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] = 8'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] = 8'h02;             // R2 instruction
                                                end
                                endcase
                        endcase
5'b01110:
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:21] = {{1{cinstr[11]}},{cinstr[11:8],cinstr[5:0]}};
                        expand[20:18] = 3'd0;           // BEQ
                        expand[17:8] = 10'd0;            // r0==r0
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Bcc;              // 0x38
                end
5'b10??0:
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};
                        expand[20:18] = 3'd0;                   // BEQ
                        expand[17:13] = 5'd0;                   // r0
                        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[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};
                        expand[20:18] = 3'd1;                   // BNE
                        expand[17:13] = 5'd0;                   // r0
                        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;
                        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[4:0];
                        expand[17:13] = {cinstr[11:8],cinstr[5]};
                        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'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] = 65'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] = 6'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[31:18] = {{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] = `Sx;
                end
5'b10011:       // SW 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] = `Sx;
                end
5'b10101:       // SH 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] = 6'd30;
                        expand[7:6] = 2'b10;
                        expand[5:0] = `Sx;
                end
5'b10111:       // SW Rt,d[FP]
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{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] = `Sx;
                end
5'b11001:
                begin   // LH
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{7{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] = {{6{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[31:18] = {{7{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] = `Sx;
                end
5'b11111:       // SW
                begin
                        expand[47:32] = 16'h0000;
                        expand[31:18] = {{6{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] = `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	48	robfinch	`// ============================================================================`
2			`// __`
3			`// \\__/ o\ (C) 2017-2018 Robert Finch, Waterloo`
4			`// \ __ / 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	58	robfinch	`expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[5]};`
62	48	robfinch	`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	59	robfinch	`expand[20:17] = 4'd0;`
76			`expand[23:21] = 3'd1;`
77	48	robfinch	`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] = `ORI;
87			`end`
88			`5'b00100: // RET / ANDI`
89			`if (cinstr[4:0]==5'd0) begin`
90			`expand[47:32] = 16'h0000;`
91			expand[5:0] = `RET;
92			`expand[7:6] = 2'b10;`
93			`expand[12:8] = 5'd31;`
94			`expand[17:13] = 5'd29;`
95			`expand[31:18] = {8'd0,cinstr[11:8],cinstr[5],3'd0};`
96			`end`
97			`else begin`
98			`expand[47:32] = 16'h0000;`
99			expand[5:0] = `ANDI;
100			`expand[7:6] = 2'b10;`
101			`expand[12:8] = cinstr[4:0];`
102			`expand[17:13] = cinstr[4:0];`
103			`expand[31:18] = {{11{cinstr[11]}},cinstr[11:8],cinstr[5]};`
104			`end`
105			`5'b00110: // SHLI`
106			`begin`
107			`expand[47:32] = 16'h0000;`
108			`expand[31:26] = 6'h0F; // immediate mode 0-31`
109			`expand[25:23] = 3'd0; // SHL`
110			`expand[22:18] = {cinstr[11:8],cinstr[5]}; // amount`
111			`expand[17:13] = cinstr[4:0];`
112			`expand[12:8] = cinstr[4:0];`
113			`expand[7:6] = 2'b10;`
114			`expand[5:0] = 8'h02; // R2 instruction`
115			`end`
116			`5'b01000:`
117			`case(cinstr[5:4])`
118			`2'd0: // SHRI`
119			`begin`
120			`expand[47:32] = 16'h0000;`
121			`expand[31:26] = 6'h0F; // shift immediate 0-31`
122			`expand[25:23] = 3'd1; // SHR`
123			`expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount`
124			`expand[17:13] = fnRp(cinstr[2:0]);`
125			`expand[12:8] = fnRp(cinstr[2:0]);`
126			`expand[7:6] = 2'b10;`
127			`expand[5:0] = 8'h02; // R2 instruction`
128			`end`
129			`2'd1: // ASRI`
130			`begin`
131			`expand[47:32] = 16'h0000;`
132			`expand[31:26] = 6'h0F; // shift immediate 0-31`
133			`expand[25:23] = 3'd3; // ASR`
134			`expand[22:18] = {cinstr[11:8],cinstr[3]}; // amount`
135			`expand[17:13] = fnRp(cinstr[2:0]);`
136			`expand[12:8] = fnRp(cinstr[2:0]);`
137			`expand[7:6] = 2'b10;`
138			`expand[5:0] = 8'h02; // R2 instruction`
139			`end`
140			`2'd2: // ORI`
141			`begin`
142			`expand[47:32] = 16'h0000;`
143			`expand[31:18] = {{9{cinstr[11]}},cinstr[11:8],cinstr[3]};`
144			`expand[17:13] = fnRp(cinstr[2:0]);`
145			`expand[12:8] = fnRp(cinstr[2:0]);`
146			`expand[7:6] = 2'b10;`
147			expand[5:0] = `ORI;
148			`end`
149			`2'd3:`
150			`case(cinstr[11:10])`
151			`2'd0: begin`
152			`expand[47:32] = 16'h0000;`
153			expand[31:26] = `SUB;
154			`expand[25:23] = 3'b011; // word size`
155			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
156			`expand[17:13] = fnRp(cinstr[2:0]);`
157			`expand[12:8] = fnRp(cinstr[2:0]);`
158			`expand[7:6] = 2'b10;`
159			`expand[5:0] = 8'h02; // R2 instruction`
160			`end`
161			`2'd1: begin`
162			`expand[47:32] = 16'h0000;`
163			expand[31:26] = `AND;
164			`expand[25:23] = 3'b011; // word size`
165			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
166			`expand[17:13] = fnRp(cinstr[2:0]);`
167			`expand[12:8] = fnRp(cinstr[2:0]);`
168			`expand[7:6] = 2'b10;`
169			`expand[5:0] = 8'h02; // R2 instruction`
170			`end`
171			`2'd2: begin`
172			`expand[47:32] = 16'h0000;`
173			expand[31:26] = `OR;
174			`expand[25:23] = 3'b011; // word size`
175			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
176			`expand[17:13] = fnRp(cinstr[2:0]);`
177			`expand[12:8] = fnRp(cinstr[2:0]);`
178			`expand[7:6] = 2'b10;`
179			`expand[5:0] = 8'h02; // R2 instruction`
180			`end`
181			`2'd3: begin`
182			`expand[47:32] = 16'h0000;`
183			expand[31:26] = `XOR;
184			`expand[25:23] = 3'b011; // word size`
185			`expand[22:18] = fnRp({cinstr[9:8],cinstr[3]});`
186			`expand[17:13] = fnRp(cinstr[2:0]);`
187			`expand[12:8] = fnRp(cinstr[2:0]);`
188			`expand[7:6] = 2'b10;`
189			`expand[5:0] = 8'h02; // R2 instruction`
190			`end`
191			`endcase`
192			`endcase`
193			`5'b01110:`
194			`begin`
195			`expand[47:32] = 16'h0000;`
196			`expand[31:21] = {{1{cinstr[11]}},{cinstr[11:8],cinstr[5:0]}};`
197			`expand[20:18] = 3'd0; // BEQ`
198			`expand[17:8] = 10'd0; // r0==r0`
199			`expand[7:6] = 2'b10;`
200			expand[5:0] = `Bcc; // 0x38
201			`end`
202			`5'b10??0:`
203			`begin`
204			`expand[47:32] = 16'h0000;`
205	52	robfinch	`expand[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};`
206	48	robfinch	`expand[20:18] = 3'd0; // BEQ`
207			`expand[17:13] = 5'd0; // r0`
208			`expand[12:8] = cinstr[4:0]; // Ra`
209			`expand[7:6] = 2'b10;`
210			expand[5:0] = `Bcc;
211			`end`
212			`5'b11??0:`
213			`begin`
214			`expand[47:32] = 16'h0000;`
215	52	robfinch	`expand[31:21] = {{4{cinstr[13]}},cinstr[13:8],cinstr[5]};`
216	48	robfinch	`expand[20:18] = 3'd1; // BNE`
217			`expand[17:13] = 5'd0; // r0`
218			`expand[12:8] = cinstr[4:0]; // Ra`
219			`expand[7:6] = 2'b10;`
220			expand[5:0] = `Bcc;
221			`end`
222			`5'b00001:`
223			`begin`
224			`expand[47:32] = 16'h0000;`
225			expand[31:26] = `MOV;
226			`expand[25:23] = 3'd7; // move current to current`
227			`expand[22:18] = 5'd0; // register set (ignored)`
228			`expand[17:13] = {cinstr[11:8],cinstr[5]};`
229			`expand[12:8] = cinstr[4:0];`
230			`expand[7:6] = 2'b10;`
231	51	robfinch	`expand[5:0] = 6'h02;`
232	48	robfinch	`end`
233			`5'b00011: // ADD`
234			`begin`
235			`expand[47:32] = 16'h0000;`
236			expand[31:26] = `ADD;
237			`expand[27:23] = 3'b011; // word size`
238			`expand[22:18] = cinstr[4:0];`
239			`expand[17:13] = {cinstr[11:8],cinstr[5]};`
240			`expand[12:8] = cinstr[4:0];`
241			`expand[7:6] = 2'b10;`
242			`expand[5:0] = 6'h02; // R2 instruction`
243			`end`
244			`5'b00101: // JALR`
245			`begin`
246			`expand[47:32] = 16'h0000;`
247			`expand[31:18] = 14'd0;`
248			`expand[17:13] = {cinstr[11:8],cinstr[5]};`
249			`expand[12:8] = cinstr[4:0];`
250			`expand[7:6] = 2'b10;`
251			expand[5:0] = `JAL;
252			`end`
253			`5'b01001: // LH Rt,d[SP]`
254			`begin`
255			`expand[47:32] = 16'h0000;`
256			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};`
257			`expand[17:13] = {cinstr[4:0]};`
258			`expand[12:8] = 65'd31;`
259			`expand[7:6] = 2'b10;`
260			expand[5:0] = `Lx;
261			`end`
262			`5'b01011: // LW Rt,d[SP]`
263			`begin`
264			`expand[47:32] = 16'h0000;`
265			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};`
266			`expand[17:13] = cinstr[4:0];`
267			`expand[12:8] = 5'd31;`
268			`expand[7:6] = 2'b10;`
269			expand[5:0] = `Lx;
270			`end`
271			`5'b01101: // LH Rt,d[fP]`
272			`begin`
273			`expand[47:32] = 16'h0000;`
274			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};`
275			`expand[17:13] = cinstr[4:0];`
276			`expand[12:8] = 6'd30;`
277			`expand[7:6] = 2'b10;`
278			expand[5:0] = `Lx;
279			`end`
280			`5'b01111: // LW Rt,d[FP]`
281			`begin`
282			`expand[47:32] = 16'h0000;`
283			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};`
284			`expand[17:13] = cinstr[4:0];`
285			`expand[12:8] = 5'd30;`
286			`expand[7:6] = 2'b10;`
287			expand[5:0] = `Lx;
288			`end`
289			`5'b10001: // SH Rt,d[SP]`
290			`begin`
291			`expand[47:32] = 16'h0000;`
292			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};`
293			`expand[17:13] = cinstr[4:0];`
294			`expand[12:8] = 5'd31;`
295			`expand[7:6] = 2'b10;`
296			expand[5:0] = `Sx;
297			`end`
298			`5'b10011: // SW Rt,d[SP]`
299			`begin`
300			`expand[47:32] = 16'h0000;`
301			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};`
302			`expand[17:13] = cinstr[4:0];`
303			`expand[12:8] = 5'd31;`
304			`expand[7:6] = 2'b10;`
305			expand[5:0] = `Sx;
306			`end`
307			`5'b10101: // SH Rt,d[fP]`
308			`begin`
309			`expand[47:32] = 16'h0000;`
310			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:8],cinstr[5],2'd2};`
311			`expand[17:13] = cinstr[4:0];`
312			`expand[12:8] = 6'd30;`
313			`expand[7:6] = 2'b10;`
314			expand[5:0] = `Sx;
315			`end`
316			`5'b10111: // SW Rt,d[FP]`
317			`begin`
318			`expand[47:32] = 16'h0000;`
319			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:8],cinstr[5],3'd4};`
320			`expand[17:13] = cinstr[4:0];`
321			`expand[12:8] = 5'd30;`
322			`expand[7:6] = 2'b10;`
323			expand[5:0] = `Sx;
324			`end`
325			`5'b11001:`
326			`begin // LH`
327			`expand[47:32] = 16'h0000;`
328			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};`
329			`expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});`
330			`expand[12:8] = fnRp(cinstr[2:0]);`
331			`expand[7:6] = 2'b10;`
332			expand[5:0] = `Lx;
333			`end`
334			`5'b11011: // LW`
335			`begin`
336			`expand[47:32] = 16'h0000;`
337			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};`
338			`expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});`
339			`expand[12:8] = fnRp(cinstr[2:0]);`
340			`expand[7:6] = 2'b10;`
341			expand[5:0] = `Lx;
342			`end`
343			`5'b11101: // SH`
344			`begin`
345			`expand[47:32] = 16'h0000;`
346			`expand[31:18] = {{7{cinstr[11]}},cinstr[11:10],cinstr[4:3],2'd2};`
347			`expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});`
348			`expand[12:8] = fnRp(cinstr[2:0]);`
349			`expand[7:6] = 2'b10;`
350			expand[5:0] = `Sx;
351			`end`
352			`5'b11111: // SW`
353			`begin`
354			`expand[47:32] = 16'h0000;`
355			`expand[31:18] = {{6{cinstr[11]}},cinstr[11:10],cinstr[4:3],3'd4};`
356			`expand[17:13] = fnRp({cinstr[9:8],cinstr[5]});`
357			`expand[12:8] = fnRp(cinstr[2:0]);`
358			`expand[7:6] = 2'b10;`
359			expand[5:0] = `Sx;
360			`end`
361			`default:`
362			`begin`
363			`expand[47:8] = 40'd0;`
364			`expand[7:6] = 2'b10;`
365			expand[5:0] = `NOP;
366			`end`
367			`endcase`
368
369			`endmodule`

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