| | 1 | `define INSN_POP_reg 9'b011xx0001 |
| | 2 | |
| | 3 | `ifdef EXECUTE |
| | 4 | `INSN_POP_reg: begin /* POP is 12 cycles! */ |
| | 5 | case (cycle) |
| | 6 | 0: `EXEC_READ(`_SP) |
| | 7 | 1: `EXEC_READ(`_SP + 1) |
| | 8 | 2: begin |
| | 9 | `EXEC_NEWCYCLE |
| | 10 | `EXEC_INC_PC |
| | 11 | end |
| | 12 | endcase |
| | 13 | end |
| | 14 | `endif |
| | 15 | |
| | 16 | `ifdef WRITEBACK |
| | 17 | `INSN_POP_reg: begin /* POP is 12 cycles! */ |
| | 18 | case (cycle) |
| | 19 | 0: begin end |
| | 20 | 1: begin |
| | 21 | case (opcode[5:4]) |
| | 22 | `INSN_stack_AF: `_F <= rdata & 8'hF0; |
| | 23 | `INSN_stack_BC: `_C <= rdata; |
| | 24 | `INSN_stack_DE: `_E <= rdata; |
| | 25 | `INSN_stack_HL: `_L <= rdata; |
| | 26 | endcase |
| | 27 | end |
| | 28 | 2: begin |
| | 29 | case (opcode[5:4]) |
| | 30 | `INSN_stack_AF: `_A <= rdata; |
| | 31 | `INSN_stack_BC: `_B <= rdata; |
| | 32 | `INSN_stack_DE: `_D <= rdata; |
| | 33 | `INSN_stack_HL: `_H <= rdata; |
| | 34 | endcase |
| | 35 | `_SP <= `_SP + 2; |
| | 36 | end |
| | 37 | endcase |
| | 38 | end |
| | 39 | `endif |
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