| | 1 | `define INSN_LD8M_A 9'b0111x0000 // 1111 for ld A, x; 1110 for ld x, A; bit 1 specifies 16m8 or 8m8 |
| | 2 | |
| | 3 | // If opcode[4], then ld A, x, else ld x, A |
| | 4 | // If opcode[1], then ld 16m8, else ld 8m8 |
| | 5 | |
| | 6 | `ifdef EXECUTE |
| | 7 | `INSN_LD8M_A: begin |
| | 8 | case (cycle) |
| | 9 | 0: begin |
| | 10 | `EXEC_INC_PC |
| | 11 | `EXEC_READ(`_PC + 16'h0001) |
| | 12 | end |
| | 13 | 1: if (opcode[4]) // LD A,x |
| | 14 | `EXEC_READ(({8'hFF, rdata})) |
| | 15 | else |
| | 16 | `EXEC_WRITE(({8'hFF, rdata}), `_A) |
| | 17 | 2: begin |
| | 18 | `EXEC_NEWCYCLE |
| | 19 | `EXEC_INC_PC |
| | 20 | end |
| | 21 | endcase |
| | 22 | end |
| | 23 | `endif |
| | 24 | |
| | 25 | `ifdef WRITEBACK |
| | 26 | `INSN_LD8M_A: begin |
| | 27 | case (cycle) |
| | 28 | 0: begin end |
| | 29 | 1: begin end |
| | 30 | 2: if (opcode[4]) `_A <= rdata; |
| | 31 | endcase |
| | 32 | end |
| | 33 | `endif |
| | 34 | |
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