| | 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 |
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