b4046e80c48316bf7179c0a0aea9b6227f91068f
[fpgaboy.git] / core / insn_alu_ext.v
1 `define INSN_ALU_EXT            9'b100xxxxxx
2
3 `ifdef EXECUTE
4         `INSN_ALU_EXT: begin
5                 if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0))
6                         `EXEC_READ(`_HL)
7                 else begin
8                         `EXEC_INC_PC
9                         case (opcode[2:0])
10                         `INSN_reg_A:    tmp <= `_A;
11                         `INSN_reg_B:    tmp <= `_B;
12                         `INSN_reg_C:    tmp <= `_C;
13                         `INSN_reg_D:    tmp <= `_D;
14                         `INSN_reg_E:    tmp <= `_E;
15                         `INSN_reg_H:    tmp <= `_H;
16                         `INSN_reg_L:    tmp <= `_L;
17                         `INSN_reg_dHL:  tmp <= rdata;
18                         endcase
19                 end
20         end
21 `endif
22
23 `ifdef WRITEBACK
24         `INSN_ALU_EXT: begin
25                 if (opcode[2:0] == `INSN_reg_dHL) begin
26                         if(cycle == 0) begin end
27                         else if(cycle == 1) begin
28                                 `EXEC_WRITE(`_HL, alu_res)
29                                 `_F <= {f_res,`_F[3:0]};
30                         end else begin
31                                 `EXEC_NEWCYCLE
32                         end
33                 end else begin
34                         case(opcode[2:0])
35                         `INSN_reg_B: `_B <= alu_res;
36                         `INSN_reg_C: `_C <= alu_res;
37                         `INSN_reg_D: `_D <= alu_res;
38                         `INSN_reg_E: `_E <= alu_res;
39                         `INSN_reg_H: `_H <= alu_res;
40                         `INSN_reg_L: `_L <= alu_res;
41                         `INSN_reg_A: `_A <= alu_res;
42                         `INSN_reg_dHL: begin end /* eat dicks */
43                         endcase
44                         `_F <= {f_res,`_F[3:0]};
45                         `EXEC_NEWCYCLE
46                 end
47         end
48 `endif
This page took 0.014741 seconds and 2 git commands to generate.