Move the core to core/

[fpgaboy.git] / core / insn_bit.v

diff --git a/core/insn_bit.v b/core/insn_bit.v
new file mode 100644 (file)
index 0000000..379215e
--- /dev/null
+++ b/core/insn_bit.v
@@ -0,0 +1,31 @@
+`ifdef EXECUTE
+       `INSN_BIT: begin
+               if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 0)) begin
+                       `EXEC_READ(`_HL)
+               end else if ((opcode[2:0] == `INSN_reg_dHL) && (cycle == 2)) begin
+                       `EXEC_NEWCYCLE
+               end else begin
+                       `EXEC_INC_PC
+                       case (opcode[2:0])
+                       `INSN_reg_A:    tmp <= `_A;
+                       `INSN_reg_B:    tmp <= `_B;
+                       `INSN_reg_C:    tmp <= `_C;
+                       `INSN_reg_D:    tmp <= `_D;
+                       `INSN_reg_E:    tmp <= `_E;
+                       `INSN_reg_H:    tmp <= `_H;
+                       `INSN_reg_L:    tmp <= `_L;
+                       `INSN_reg_dHL:  tmp <= rdata;
+                       endcase
+                       if (opcode[2:0] != `INSN_reg_dHL) begin
+                               `EXEC_NEWCYCLE
+                       end
+               end
+       end
+`endif
+
+`ifdef WRITEBACK
+       `INSN_BIT: begin
+               if ((opcode[2:0] != `INSN_reg_dHL) || (cycle == 1))
+                       `_F <= {~tmp[opcode[5:3]], 2'b01, `_F[4:0]};
+       end
+`endif