git.joshuawise.com / fpgaboy.git / blame
| Commit | Line | Data |
|---|---|---|
| e7fe9dc2 JW |
1 | `define INSN_ADD_HL 9'b000xx1001 |
| 2 | ||
| 00a4c19f JW |
3 | `ifdef EXECUTE |
| 4 | `INSN_ADD_HL: begin | |
| 5 | case (cycle) | |
| 6 | 0: case (opcode[5:4]) | |
| 7 | `INSN_reg16_BC: {tmp,tmp2} <= `_BC; | |
| 8 | `INSN_reg16_DE: {tmp,tmp2} <= `_DE; | |
| 9 | `INSN_reg16_HL: {tmp,tmp2} <= `_HL; | |
| 10 | `INSN_reg16_SP: {tmp,tmp2} <= `_SP; | |
| 11 | endcase | |
| 12 | 1: begin | |
| 13 | `EXEC_INC_PC | |
| 14 | `EXEC_NEWCYCLE | |
| 15 | end | |
| 16 | endcase | |
| 17 | end | |
| 18 | `endif | |
| 19 | ||
| 20 | `ifdef WRITEBACK | |
| 21 | `INSN_ADD_HL: begin | |
| 22 | case (cycle) | |
| 23 | 0: {tmp,tmp2} <= `_HL + {tmp,tmp2}; | |
| 24 | 1: begin | |
| 25 | `_F <= { /* Z */ `_F[7], | |
| 26 | /* N */ 1'b0, | |
| 27 | /* H */ (({`_HL} + {tmp,tmp2}) & 16'h1000) ? 1'b1 : 1'b0, | |
| 28 | /* C */ (({1'b0,`_HL} + {1'b0,tmp,tmp2}) >> 16 == 1) ? 1'b1 : 1'b0, | |
| 29 | `_F[3:0] | |
| 30 | }; | |
| 31 | `_HL <= {tmp, tmp2}; | |
| 32 | end | |
| 33 | endcase | |
| 34 | end | |
| 35 | `endif |