core/insn_ldm8_a.v

   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