core/insn_pop_reg.v

   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