git.joshuawise.com / fpgaboy.git / blame
| Commit | Line | Data |
|---|---|---|
| e7fe9dc2 JW |
1 | `define INSN_LDx_AHL 9'b0001xx010 // LDD/LDI A,(HL) / (HL),A |
| 2 | ||
| 3ad960bd JW |
3 | `ifdef EXECUTE |
| 4 | `INSN_LDx_AHL: begin | |
| 5 | case (cycle) | |
| 5c33c5c0 JW |
6 | 0: if (opcode[3]) // LDx A, (HL) |
| 7 | `EXEC_READ(`_HL) | |
| 8 | else | |
| 9 | `EXEC_WRITE(`_HL, `_A) | |
| 3ad960bd | 10 | 1: begin |
| 5c33c5c0 JW |
11 | `EXEC_NEWCYCLE |
| 12 | `EXEC_INC_PC | |
| 3ad960bd JW |
13 | end |
| 14 | endcase | |
| 15 | end | |
| 16 | `endif | |
| 17 | ||
| 18 | `ifdef WRITEBACK | |
| 19 | `INSN_LDx_AHL: begin | |
| 20 | case (cycle) | |
| 21 | 0: begin /* Type F */ end | |
| 22 | 1: begin | |
| 23 | if (opcode[3]) | |
| 5c33c5c0 JW |
24 | `_A <= rdata; |
| 25 | `_HL <= opcode[4] ? // if set, LDD, else LDI | |
| 26 | (`_HL - 1) : | |
| 27 | (`_HL + 1); | |
| 3ad960bd JW |
28 | end |
| 29 | endcase | |
| 30 | end | |
| 31 | `endif |