Move the core to core/

[fpgaboy.git] / core / insn_ldx_ahl.v

diff --git a/core/insn_ldx_ahl.v b/core/insn_ldx_ahl.v
new file mode 100644 (file)
index 0000000..a2d2420
--- /dev/null
+++ b/core/insn_ldx_ahl.v
@@ -0,0 +1,29 @@
+`ifdef EXECUTE
+       `INSN_LDx_AHL: begin
+               case (cycle)
+               0:      if (opcode[3])          // LDx A, (HL)
+                               `EXEC_READ(`_HL)
+                       else
+                               `EXEC_WRITE(`_HL, `_A)
+               1:      begin
+                               `EXEC_NEWCYCLE
+                               `EXEC_INC_PC
+                       end
+               endcase
+       end
+`endif
+
+`ifdef WRITEBACK
+       `INSN_LDx_AHL: begin
+               case (cycle)
+               0:      begin /* Type F */ end
+               1:      begin
+                               if (opcode[3])
+                                       `_A <= rdata;
+                               `_HL <= opcode[4] ? // if set, LDD, else LDI
+                                       (`_HL - 1) :
+                                       (`_HL + 1);
+                       end
+               endcase
+       end
+`endif