insn_ldm16_a.v

   1 // If opcode[4], then ld A, x, else ld x, A
   2 // If opcode[1], then ld 16m8, else ld 8m8
   3
   4 `ifdef EXECUTE
   5         `INSN_LD16M_A: begin
   6                 case (cycle)
   7                 0:      begin
   8                                 `EXEC_INC_PC
   9                                 `EXEC_READ(`_PC + 16'h0001)
  10                         end
  11                 1:      begin
  12                                 `EXEC_INC_PC                    // we only hit here if 16m8
  13                                 `EXEC_READ(`_PC + 16'h0001)
  14                         end
  15                 2:      if (opcode[4])  // LD A,x
  16                                 `EXEC_READ(({rdata, tmp}))
  17                         else
  18                                 `EXEC_WRITE(({rdata, tmp}), `_A)
  19                 3:      begin
  20                                 `EXEC_NEWCYCLE
  21                                 `EXEC_INC_PC
  22                         end
  23                 endcase
  24         end
  25 `endif
  26
  27 `ifdef WRITEBACK
  28         `INSN_LD16M_A: begin
  29                 case (cycle)
  30                 0:      begin end
  31                 1:      tmp <= rdata;
  32                 2:      begin end
  33                 3:      if (opcode[4]) `_A <= rdata;
  34                 endcase
  35         end
  36 `endif
  37