[fpgaboy.git] / core / insn_ldx_ahl.v

`define INSN_LDx_AHL		9'b0001xx010	// LDD/LDI A,(HL) / (HL),A

`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
Commit	Line	Data
e7fe9dc2 JW	1	`define INSN_LDx_AHL 9'b0001xx010 // LDD/LDI A,(HL) / (HL),A
e7fe9dc2 JW	2
3ad960bd JW	3	`ifdef EXECUTE
	4	`INSN_LDx_AHL: begin
	5	case (cycle)
5c33c5c0 JW	6	0: if (opcode[3]) // LDx A, (HL)
	7	`EXEC_READ(`_HL)
	8	else
	9	`EXEC_WRITE(`_HL, `_A)
3ad960bd	10	1: begin
5c33c5c0 JW	11	`EXEC_NEWCYCLE
5c33c5c0 JW	12	`EXEC_INC_PC
3ad960bd JW	13	end
	14	endcase
	15	end
	16	`endif
	17
	18	`ifdef WRITEBACK
	19	`INSN_LDx_AHL: begin
	20	case (cycle)
	21	0: begin /* Type F */ end
	22	1: begin
	23	if (opcode[3])
5c33c5c0 JW	24	`_A <= rdata;
	25	`_HL <= opcode[4] ? // if set, LDD, else LDI
	26	(`_HL - 1) :
	27	(`_HL + 1);
3ad960bd JW	28	end
	29	endcase
	30	end
	31	`endif